Capitation and enhanced fee-for-service models for primary care reform: a population-based evaluation

Abstract

Background

Primary care reform in Ontario, Canada, included the initiation of a blended capitation model in 2001–2002 and an enhanced fee-for-service model in 2003. Both models involve patient rostering, incentives for preventive care and requirements for after-hours care. We evaluated practice characteristics and patterns of care under both models.

Methods

Using administrative data, we identified physicians belonging to either the capitation or the enhanced fee-for-service group throughout the period from Sept. 1, 2005, to Aug. 31, 2006, and their enrolled patients. Practices were stratified by location (urban v. rural). We compared the groups in terms of practice characteristics and patterns of care, including comprehensiveness of care, continuity of care, after-hours care, visits to the emergency department and uptake of new patients.

Results

Patients in the capitation and enhanced fee-for-service practices had similar demographic characteristics. Patients in capitation practices had lower morbidity and comorbidity indices. Comprehensiveness and continuity of care were similar between the 2 groups. Compared with patients in enhanced fee-for-service practices, those in capitation practices had less after-hours care (adjusted rate ratio [RR] 0.68, 95% confidence interval [CI] 0.61–0.75) and more visits to emergency departments (adjusted RR 1.20, 95% CI 1.15–1.25). Overall, physicians in the capitation group enrolled fewer new patients than did physicians in the enhanced fee-for-service group (37.0 v. 52.0 per physician); the same was true of new graduates (60.3 v. 72.1 per physician).

Interpretation

Physicians enrolled in the capitation model had different practice characteristics than those in the enhanced fee-for-service model. These characteristics appeared to be pre-existing and not due to enrolment in a new model. Although the capitation model provides an alternative to fee-for-service practice, its characteristics should be the focus of future policy development and research.

Primary health care is facing a number of serious challenges internationally, with questions being raised about whether it will even survive in some settings.¹ Fundamental issues include shortages in human resources and maldistribution of physicians; dissatisfaction on the part of providers and patients; gaps between guideline-recommended care and provided care; and a preference of trainees to choose specialty careers. Close to 4 million Canadians do not have a family physician, and more than 2 million report difficulties in accessing routine or ongoing care at any time of day as well as immediate care for minor health problems at any time of day.² Canadians in rural areas face geographic barriers to care, fewer available health care professionals than in urban areas and higher rates of disease.³

In response to these challenges, policy-makers in Canada and elsewhere are considering or are implementing interdisciplinary teams, new organizational structures, new governance and reimbursement models, requirements for after-hours care, provision of after-hours advice by telephone, electronic health records and other information technology, and pay-for-performance initiatives. Many of these directions are incorporated in the Medical Home concept in the United States⁴ and in the Quality and Outcomes Framework in the United Kingdom.⁵ Although there is evidence for the effectiveness of some of these initiatives, most have not been rigorously evaluated. Reimbursement models, perhaps the best-studied aspect of primary care reform, seem to influence some aspects of physician behaviour. However, there is a lack of evidence about their ultimate impact on patient outcomes.⁶

In Ontario, Canada, a blended capitation model called the Family Health Network was introduced in 2001–2002. An enhanced fee-for-service blended model called the Family Health Group was introduced in 2003. These models rapidly attracted physicians. By 2006, they were the most common models of care in Ontario, exceeding the straight fee-for-service plan.

Physicians are free to select one of the models or remain in the straight fee-for-service plan. Many make decisions based on a free revenue analysis that uses their previous billings to project their income under the capitation model. Our evaluation, involving more than 500 physicians and close to half a million patients under the capitation model, is therefore an examination of one of the world’s largest short-term voluntary shifts from fee-for-service to capitation. Our objective was to evaluate practice characteristics and patterns of care under the capitation model, including comprehensiveness, continuity, after-hours care, visits to the emergency department and uptake of unattached patients. We used practices in the enhanced fee-for-service model as a contemporaneous comparison group.

Methods

Setting

Ontario is Canada’s largest province, with a population in 2006 of about 12.2 million people.⁷ Its health care system is provincially run according to the principles of the Canada Health Act,⁸ the basis of which is to “facilitate reasonable access to health services without financial or other barriers.” Accordingly, necessary physician and hospital services are fully covered with no copayments or deductibles. Prescription medications are not universally covered except for people 65 years of age and older and people receiving welfare or disability coverage. The province had about 22 000 practising physicians in 2006, about half of whom were specialists.⁹ General internists typically have referral- and hospital-based practices in Ontario, but many pediatricians provide primary care, especially those in larger urban centres.

Models

The main difference between the models is how physicians are reimbursed. In the capitation model, the majority of reimbursement is through age- and sex-adjusted capitation payments. In the enhanced fee-for-service model, physicians receive the majority of payment through fee-for-service billing. Another difference is patient enrolment, which is mandatory only in the capitation model. Many of the other features of these models are similar and are described in detail in Table 1.

Table 1.

Characteristics of enhanced fee-for-service and capitation models^*

Characteristic	Enhanced fee-for-service model	Capitation model
Roster size	No limit	No limit; base capitation rate is reduced by 50% for each patient enrolled beyond an average of 2400 patients per physician
Patient enrolment	Optional	Required
After-hours call	Required	Required
Fee-for-service payments	Full payment plus 10% premium for 21 comprehensive care services	Payment at 10% of full rate for 56 services for enrolled patients; established maximum fee- for-service payments annually
Capitation rate	Not applicable	Adjusted for age and sex
Access bonus	Not applicable	Additional payment, reduced if enrolled patient sees a nonspecialist physician outside the group
Extended hours	One 3-hour evening or weekend session per physician per week, to a maximum of 5 sessions; exempted if > 50% of physicians provide emergency, anesthesia or obstetrics coverage	Same as enhanced fee-for-service model
Income stabilization	Not applicable	Guaranteed annual income for new graduates
Management of comprehensive care	Monthly capitation payment of $2.15 per enrolled patient after the first year to physicians who provide after-hours block coverage	Same as enhanced fee-for-service model
After-hours care	Additional 20% of fee-for-service payment for enrolled and virtually enrolled patients for 9 basic office services	Same as enhanced fee-for-service model
Diabetes care	Annual fee per enrolled patient for coordinating, providing and documenting required elements of diabetes care	Same as enhanced fee-for-service model
Group management and leadership	Not applicable	Annual fee per enrolled patient
Targeted medical education	Not applicable	Hourly fee up to 24 hours
Palliative care	Annual fee after billing for palliative care for 4 or more enrolled patients	Not applicable but eligible for full fee-for- service payments for palliative care, obstetric deliveries, hospital services, office procedures, prenatal care, home visits (other than palliative)
Management of heart failure care	Annual fee per enrolled patient for coordinating, providing and documenting required elements of heart failure care	Same as enhanced fee-for-service model
Smoking cessation	Annual fee per enrolled patient who smokes to initiate dialogue about quitting and to provide dedicated subsequent counselling sessions	Same as enhanced fee-for-service model
Cumulative preventive care	Annual fee for reaching cumulative preventive care thresholds (i.e., Papanicolaou smears, mammograms, childhood immunizations, flu shots, screening for colorectal cancer)	Same as enhanced fee-for-service model
Serious mental illness	Annual fee for 5–9 enrolled patients with bipolar disorder or schizophrenia; fee doubles for 10 or more patients	Same as enhanced fee-for-service model
Unattached patient fee	A one-time fee for enrolling an acute care patient without a family physician following discharge from an inpatient hospital stay	Same as enhanced fee-for-service model
New patient premium	A one-time fee for up to 60 enrolled new patients without a family physician; increase in fee for patients aged 65–74, and further increase in fee for patients aged 75 and over	Same as enhanced fee-for-service model
New graduate incentive	Fee for enrolling up to 300 people who qualify as new patients in the first year of practice	Same as enhanced fee-for-service model

^*Source: Ontario Medical Association.

Study design and population

We created a cohort of physician groups that were in existence from Sept. 1, 2005, to Aug. 31, 2006. Study physicians were those who were consistently part of the same capitation or enhanced fee-for-service group during that period. Study patients were those who were enrolled to these physicians during the study period. Before analysis of the data, all patient and provider identifiers were removed and replaced with unique encrypted numbers.

We examined the characteristics of the study physicians and patients in each model, stratified by geographic location according to the Rurality Index of Ontario.¹⁰ The strata used were major urban (index 0–9), non-major urban (10–44) and rural (≥ 45). The Rurality Index ranges from 0 to 100 and is a policy-relevant measure used to assign incentive payments to physicians who practise in communities with an index of 45 or higher (rural or remote). More than 500 communities in Ontario are considered rural or remote, most populations ranging from a few hundred people to about 20 000. Major urban areas tend to have populations between 100 000 and 2.5 million; some smaller centres near major cities also fall into this category.

We examined patient morbidity using prevalence data for acute myocardial infarction, congestive heart failure, diabetes mellitus and hypertension.^11–14 We used the Johns Hopkins Adjusted Clinical Groups Case-Mix System¹⁵ to measure comorbidity and morbidity. The system uses diagnostic information obtained from administrative databases to describe and predict the use of health care resources. In this study, we used Resource Utilization Bands, which range from 0 (lowest expected health care costs) to 5 (highest expected health care costs), to categorize patients according to their morbidity and corresponding expected use of health care resources; we used Aggregated Diagnosis Groups, which range from 0 (no diagnosis group) to ≥ 10 (at least 10 distinct diagnosis groups) to measure the level of comorbidity.

Data sources

We obtained data through a comprehensive research agreement with the Ontario Ministry of Health and Long-Term Care. The Corporate Provider Database, current to March 2007, was the source we used for demographic data on practising physicians in Ontario. For country of graduation we used the Institute for Clinical Evaluative Sciences Physician Database, current to the 2004 fiscal year.

To identify patients enrolled by study physicians, we used Client Agency Program Enrolment tables for the period Sept. 1, 2005, to Aug. 31, 2006. The Registered Persons Database, Ontario’s health care registry, provided us with patient information (e.g., age, sex and place of residence) for all people covered by the Ontario Health Insurance Plan. We used physician billing claims submitted to the Ontario Health Insurance Plan to identify patient visits by type (physician’s office, inpatient, emergency department or after-hours visit) and to identify diagnoses and provision of different types of services. We used the Canadian Institute for Health Information’s Discharge Abstract Database to obtain data on hospital diagnoses and its National Ambulatory Care Registry System to obtain data on visits to emergency departments.

We derived neighbourhood income quintiles by linking 2001 census data to the patients’ residential postal code data. Statistics Canada adjusted income for household size and community size such that each community would be expected to have 20% of its population in each income quintile.

Outcome measures

The Ontario Ministry of Health and Long-Term Care defines comprehensiveness of care according to a group of 21 different services. We calculated the mean number and percent of services provided by physicians in each model, stratified by geographic location. We examined continuity of care using the Usual Provider of Care and Continuity of Care indices.^16–18 We used the fee code for after-hours visits to calculate the proportion of visits made after hours.

We examined the number of visits to emergency departments in each model, stratified by geographic location, to determine whether enhanced access to care resulted in fewer visits to emergency departments. We evaluated semiurgent and nonurgent visits to emergency departments (Canadian Triage and Acuity Scale categories 4 and 5) in relation to more urgent visits (categories 1 to 3).¹⁹ We compared the number of visits made by enrolled patients during the study period with the number of visits made by the same patients from Sept. 1, 2003, to Aug. 31, 2004; we chose this earlier period for comparison because it was before most of the study physicians had joined a capitation or enhanced fee-for-service group. We limited our analysis to patients who were alive on Sept. 1, 2003.

We examined the number of patients without a physician (unattached patients) enrolled by study physicians in each model during the study period. We also examined the number of unattached patients enrolled by new graduates in each model.

Statistical analysis

We used regression models to control for physician and patient characteristics for the main outcomes of after-hours visits and visits to emergency departments. We adjusted for the physician characteristics of practice size, foreign graduation, years since graduation, months in practice group and group size. We also adjusted for patient characteristics, including age, sex, neighbourhood income quintile, morbidity, comorbidity and time enrolled in the physician group. We built Poisson regression models, which used generalized estimating equations, to account for the lack of independence resulting from the nested structure of the data (patients nested within physician nested within group).

Research ethics approval

This study was approved by the Research Ethics Board of Sunnybrook Health Sciences Centre, Toronto, Ontario.

Results

Physician characteristics were similar across the capitation and enhanced fee-for-service groups except for a lower proportion of foreign graduates in the capitation model (Table 2). Compared with physicians in the enhanced fee-for-service model, those in the capitation model had more enrolled patients; they also had a higher proportion of inpatient and emergency department visits relative to office visits. These patterns were consistent across geographic areas. In both the capitation and enhanced fee-for-service models, physicians in rural areas were more likely than those in urban areas to be male and less likely to be foreign graduates. In addition, rural physicians had fewer enrolled patients and had a higher proportion of inpatient and emergency department visits relative to office visits compared with physicians in urban areas.

Table 2.

Characteristics of study physicians^* in enhanced fee-for-service and capitation groups, by location

	All locations		Major urban centres		Non-major urban centres		Rural centres
Characteristic	Enhanced fee-for-service	Capitation	Enhanced fee-for-service	Capitation	Enhanced fee-for-service	Capitation	Enhanced fee-for-service	Capitation
No. of physicians	3553	507	2646	233	734	177	173	97
No. of groups	274	53	179	21	73	21	22	11
Male, no. (%)	2267 (63.8)	319 (62.9)	1657 (62.6)	130 (55.8)	490 (66.8)	121 (68.4)	120 (69.4)	68 (70.1)
Age, yr, mean (SD)	49.4 (9.9)	47.5 (9.3)	49.7 (9.9)	47.9 (9.1)	48.4 (10.0)	47.2 (9.6)	48.8 (10.4)	47.1 (9.4)
No. of years since graduation, mean (SD)	23.9 (10.3)	21.8 (9.8)	24.4 (10.2)	22.4 (9.6)	22.7 (10.5)	21.5 (9.7)	22.6 (10.8)	21.1 (10.4)
Foreign graduate, no. (%)	682 (19.2)	47 (9.3)	558 (21.1)	29 (12.4)	96 (13.1)	12 (6.8)	28 (16.2)	6 (6.2)
Total no. patients enrolled, mean (SD)	708.6 (566.9)	960.8 (617.7)	716.5 (559.7)	1007.6 (705.3)	707.6 (594.5)	989.7 (583.6)	591.4 (560.5)	795.7 (469.5)
No. of months in group, median (IQR)	25.3 (16.5)	25.7 (14.0)	24.4 (17.3)	25.3 (15.0)	28.8 (14.9)	25.0 (16.0)	24.4 (11.1)	28.0 (8.0)
Type of visits, %
Office	86	76	90	85	79	74	66	57
Inpatient	4	8	3	5	7	10	10	13
Emergency department	3	7	1	1	7	8	14	20
Other	7	9	7	9	8	8	10	10

Note: IQR = interquartile range, SD = standard deviation.

^*Physicians who were consistently part of the same enhanced fee-for-service or capitation group from Sept. 1, 2005, to Aug. 31, 2006.

The age, sex and socioeconomic characteristics of patients were similar across the capitation and enhanced fee-for-service groups (Table 3). Those whose physicians were in the capitation group were less likely to have chronic conditions and had less morbidity and comorbidity compared with patients whose physicians were in the enhanced fee-for-service group. The lowest income quintile, expected to comprise 20% of the population, was underrepresented in both models except for capitation practices in rural areas, where it was overrepresented. Patients in rural areas were more likely to have chronic conditions but did not differ substantially in overall morbidity or comorbidity with patients in other geographic areas.

Table 3.

Characteristics of study patients^* in enhanced fee-for-service and capitation practices, by location

	Location / physician group; no. (%) of patients†
	All locations		Major urban centres		Non-major urban centres		Rural centres
Characteristic	Enhanced fee-for-service	Capitation	Enhanced fee-for-service	Capitation	Enhanced fee-for-service	Capitation	Enhanced fee-for-service	Capitation
No. of patients	2 517 527	487 131	1 895 801	234 773	519 412	175 177	102 314	77 181
Age as of January 2006, yr, mean (SD)	41.2 (23.0)	40.5 (23.0)	40.8 (22.8)	39.9 (22.5)	41.6 (23.8)	40.2 (23.4)	42.9 (23.5)	43.1 (23.8)
Age group, yr
< 2	45 434 (1.8)	7 254 (1.5)	34 396 (1.8)	3 432 (1.5)	9 535 (1.8)	2 847 (1.6)	1 503 (1.5)	975 (1.3)
2–64	2 027 088 (80.5)	397 083 (81.5)	1 538 769 (81.2)	195 708 (83.4)	408 527 (78.7)	141 942 (81.0)	79 792 (78.0)	59 433 (77.0)
≥ 65	445 005 (17.7)	82 794 (17.0)	322 636 (17.0)	35 633 (15.2)	101 350 (19.5)	30 388 (17.3)	21 019 (20.5)	16 773 (21.7)
Male	1 111 376 (44.1)	225 652 (46.3)	834 125 (44.0)	106 264 (45.3)	230 875 (44.4)	82 926 (47.3)	46 376 (45.3)	36 462 (47.2)
Neighbourhood Income quintile
1 (lowest)	364 470 (14.5)	76 120 (15.6)	273 693 (14.4)	32 343 (13.8)	73 824 (14.2)	23 095 (13.2)	16 953 (16.6)	20 682 (26.8)
2	443 833 (17.6)	91 881 (18.9)	328 811 (17.3)	38 881 (16.6)	96 555 (18.6)	30 797 (17.6)	18 467 (18.0)	22 203 (28.8)
3	509 274 (20.2)	94 948 (19.5)	377 752 (19.9)	46 092 (19.6)	110 165 (21.2)	36 393 (20.8)	21 357 (20.9)	12 463 (16.1)
4	564 544 (22.4)	100 329 (20.6)	427 634 (22.6)	53 385 (22.7)	114 600 (22.1)	39 490 (22.5)	22 310 (21.8)	7 454 (9.7)
5 (highest)	582 441 (23.1)	105 068 (21.6)	449 654 (23.7)	60 031 (25.6)	113 797 (21.9)	39 503 (22.6)	18 990 (18.6)	5 534 (7.2)
Missing data	52 965 (2.1)	18 785 (3.9)	38 257 (2.0)	4 041 (1.7)	10 471 (2.0)	5 899 (3.4)	4 237 (4.1)	8 845 (11.5)
Previous acute myocardial infarction	36 577 (1.5)	6 948 (1.4)	25 592 (1.3)	2 941 (1.3)	8 895 (1.7)	2 604 (1.5)	2 090 (2.0)	1 403 (1.8)
Congestive heart failure	57 213 (2.3)	10 229 (2.1)	39 324 (2.1)	4 023 (1.7)	14 458 (2.8)	3 966 (2.3)	3 431 (3.4)	2 240 (2.9)
Diabetes mellitus	227 718 (9.0)	34 173 (7.0)	171 228 (9.0)	15 949 (6.8)	46 566 (9.0)	11 932 (6.8)	9 924 (9.7)	6 292 (8.2)
Hypertension	635 629 (25.2)	104 650 (21.5)	468 400 (24.7)	47 949 (20.4)	138 621 (26.7)	38 563 (22.0)	28 608 (28.0)	18 138 (23.5)
Resource Utilization Band,‡ mean (SD)	2.4 (1.1)	2.1 (1.2)	2.5 (1.1)	2.2 (1.2)	2.4 (1.2)	2.1 (1.2)	2.4 (1.2)	2.1 (1.3)
No. of Aggregated Diagnosis Groups§
< 5	79.3	88.0	78.6	87.6	81.3	87.9	82.5	89.0
6–9	17.9	10.7	18.5	11.0	16.1	10.7	15.1	9.8
≥ 10	2.8	1.3	2.9	1.4	2.5	1.4	2.4	1.3

Note: SD = standard deviation.

^*Patients enrolled to a physician who was consistently part of the same enhanced fee-for-service or capitation group from Sept. 1, 2005, to Aug. 31, 2006.

^†Unless stated otherwise.

^‡Resource Utilization Bands categorize patients according to their morbidity and corresponding expected use of health care resources; they range from 0 (lowest expected health care costs) to 5 (highest expected health care costs).

^§Aggregated Diagnosis Groups indicate a patientís level ofcomorbidity, ranging from 0 (no diagnosis group) to ≥ 10 (at least 10 distinct diagnosis groups).

Comprehensiveness of care was slightly higher in the enhanced fee-for-service practices than in the capitation practices. Continuity of care was similar across the groups (Table 4). The proportion of visits billed as after-hours visits was lower in the capitation group than in the enhanced fee-for-service group; the same was true for the proportion of after-hours visits that were to study physicians. The proportion of physicians with no after-hours visits was higher in the capitation than in the enhanced fee-for-service group. Comprehensiveness of care was similar across locations; however, continuity of care was higher in rural areas than in urban areas in both the capitation and enhanced fee-for-service groups. Patients in rural areas had considerably less after-hours care than patients in urban areas; however, the proportion of after-hours visits that were to enrolling physicians was higher in rural areas.

Table 4.

Comprehensiveness of care provided in enhanced fee-for-service and capitation groups, by location

	All locations		Major urban centres		Non-major urban centres		Rural centres
Variable	Enhanced fee-for-service	Capitation	Enhanced fee-for-service	Capitation	Enhanced fee-for-service	Capitation	Enhanced fee-for-service	Capitation
Comprehensiveness of care*
Mean % of services provided per physician	64.3	69.4	63.6	69.0	66.6	71.9	64.6	66.1
No. of services provided per physician, % of physicians
0	0.3	0.4	0.2	0.4	0.5	0.6	0.6	0.0
1–5	0.9	2.2	0.6	1.3	1.9	2.3	1.2	4.1
6–11	17.0	8.5	18.5	10.3	11.3	2.8	19.1	14.4
12–17	78.0	78.3	77.8	80.7	79.4	77.4	75.1	74.2
18–21	3.8	10.7	2.9	7.3	6.8	16.9	4.0	7.2
Continuity of care
Usual Provider of Continuity index, mean (SD)	79.8 (21.7)	78.6 (21.9)	79.0 (22.0)	77.0 (22.8)	81.8 (20.5)	79.3 (21.1)	85.2 (19.2)	82.4 (19.9)
Continuity of Care index, mean (SD)	0.7 (0.3)	0.7 (0.4)	0.7 (0.4)	0.6 (0.4)	0.7 (0.3)	0.7 (0.4)	0.8 (0.3)	0.8 (0.3)
After-hours visits
% of all visits that were after hours	9	5	11	6	4	5	2	1
% of after-hours visits that were to enrolling physician	75	44	76	42	65	44	85	92
% of visits to enrolling physician that were after hours	10	4	12	4	5	4	4	1
% of physicians with no after-hours visits	12	25	7	12	19	22	50	61

Note: SD = standard deviation.

^*Calculated as the mean number and percent of 21 services provided by physicians in each model. Ontario Health Insurance Plan billing codes for the 21 services are as follows: A001, A003, A007, A008, A888, A901, A902, C010, C882, E075, G365, G538, G539, G590, G591, K005, K013, K017, K022, K023 and K030.

Patterns of use of emergency department services are indicated in Table 5. Compared with patients in enhanced fee-for-service practices, those in capitation practices had more visits to emergency departments, a higher proportion of visits that were semiurgent and nonurgent, and a lower proportion of visits to emergency departments that were after hours. Patients in non-major urban centres and rural areas had higher rates of emergency department use and a higher proportion of visits that were less urgent than patients in urban areas. Use of emergency department services by the study patients in 2003/04 was similar to use during the study period (Table 5).

Table 5.

Use of emergency department services by study patients, by location and type of physician group

	All locations		Major urban centres		Non-major urban centres		Rural centres
Variable	Enhanced fee-for-service	Capitation	Enhanced fee-for-service	Capitation	Enhanced fee-for-service	Capitation	Enhanced fee-for-service	Capitation
No. of visits, mean (SD)	0.4 (1.2)	0.5 (1.3)	0.3 (1.1)	0.3 (0.9)	0.6 (1.4)	0.6 (1.3)	0.9 (2.0)	1.0 (1.9)
Ratio of semiurgent or nonurgent visits to urgent visits*	0.9	1.6	0.6	0.7	1.5	1.6	2.6	4.8
Ratio of after-hours to regular-hour visits†	0.3	0.2	0.3	0.3	0.2	0.2	0.2	0.1
% of patients who visited emergency department during past 6 months‡	23.2	27.7	20.3	20.6	30.6	30.3	39.2	43.3
No. of visits in 2005/06, mean (SD)	0.48 (1.07)	0.49 (1.21)	0.31 (0.94)	0.32 (0.89)	0.54 (1.25)	0.52 (1.18)	0.80 (1.84)	0.93 (1.82)
No. of visits in 2003/04, mean (SD)	0.37 (1.05)	0.48 (1.21)	0.30 (0.90)	0.32 (0.88)	0.54 (1.31)	0.52 (1.24)	0.84 (1.80)	0.90 (1.79)

Note: SD = standard deviation.

^*Semiurgent and nonurgent visits were those rated as 4 and 5 on the Canadian Triage and Acuity Scale; urgent visits were those rated as 1, 2 or 3 on the scale.¹⁹

^†Visits during regular hours were those on weekdays from 9 am to 5 pm.

^‡From October 2005 to March 2006.

After adjustment for physician and patient characteristics, we found that patients in capitation practices continued to have less after-hours care than patients in enhanced fee-for-service practices. This trend was consistent across geographic locations; the difference was strongest in rural areas and not significant in non-major urban areas (Figure 1). The difference in after-hours visits overall by geographic location continued after we adjusted for physician and patient characteristics, with many fewer after-hours visits in rural areas than in major urban and non-major urban areas. Physician characteristics associated with increased after-hours visits included higher patient enrolment, male sex, foreign graduation, fewer years since graduation and smaller group size. Patient characteristics associated with increased after-hours visits included low neighbourhood income quintile, decreasing age, female sex, and higher morbidity and comorbidity indices.

Figure 1.

Adjusted odds ratios (ORs) of after-hours visits among patients whose physicians were reimbursed through a blended capitation model compared with patients whose physicians were reimbursed through an enhanced fee-for-service model. Adjustments were made for the physician and patient characteristics listed in the figure. Values less than 1.0 indicate fewer after-hours visits in the capitation model than in the enhanced fee-for-service model. CI = confidence interval. *Resource Utilization Bands categorize patients according to their morbidity and corresponding expected use of health care resources; they range from 0 (lowest expected health care costs) to 5 (highest expected health care costs). †Aggregated Diagnosis Groups indicate a patient’s level of comorbidity, ranging from 0 (no diagnosis group) to ≥ 10 (at least 10 distinct diagnosis groups).

After adjustment for physician and patient characteristics, we found that patients in capitation practices continued to have higher rates of use of emergency department services than patients in enhanced fee-for-service practices. This finding was consistent and significant across all 3 geographic locations (Figure 2). Patients in non-major urban and rural areas had more visits to an emergency department than patients in urban areas. Physician factors associated with increased emergency department visits included fewer enrolled patients, male sex, longer time belonging to a group, graduation from a Canadian medical school and small group size. Patient factors associated with increased emergency department visits included low neighbourhood income quintile, decreasing age, male sex, and higher morbidity and comorbidity.

Figure 2.

Adjusted odds ratios (ORs) of use of emergency department visits among patients whose physicians were reimbursed through a blended capitation model compared with patients whose physicians were reimbursed through an enhanced fee-for-service model. Adjustments were made for the physician and patient characteristics listed in the figure. Values greater than 1.0 indicate more visits to an emergency department in the capitation model than in the enhanced fee-for service model. CI = confidence interval. *See caption of Figure 1 for explanations of Resource Utilization Bands and Aggregated Diagnosis Groups.

Overall, physicians in capitation practices enrolled fewer new patients (37.0 per physician) than did physicians in enhanced fee-for-service practices (52.0 per physician). The same was true of new graduates, with 60.3 new patients enrolled per physician in capitation practices and 72.1 per physician in enhanced fee-for-service practices.

Interpretation

We analyzed data collected during one of the largest modern conversions from a fee-for-service to a capitation-based physician reimbursement model. We found several distinct differences in practice characteristics between these models. Compared with practices in the enhanced fee-for-service model, those in the capitation model had patients who had lower morbidity and comorbidity indices, received less after-hours care and had more visits to emergency departments. In addition, they had physicians who enrolled fewer new patients. Both models had patients of higher socioeconomic status than expected in their community. Compared with patients in enhanced fee-for-service practices, those in capitation practices had higher rates of use of emergency department services both during the study period and during the period before their physicians were likely to have changed reimbursement models. This finding suggests that this was a pre-existing pattern of use and not a result of the conversion to the capitation model. The capitation model appears to have attracted physicians with certain practice styles and patient populations.

The capitation model that we examined was not set up to adjust for patient morbidity and comorbidity. Therefore, payment was adjusted only for age and sex, which may have contributed to the differences in morbidity and comorbidity that we observed between the 2 practice types. Another feature of the capitation model is large retention bonuses when patients do not seek outside primary care. This feature probably contributed to the higher proportion of physicians in rural areas choosing the capitation model than the enhanced fee-for-service model because there is less availability of outside care in smaller centres than in urban centres. Exemptions from evening and weekend clinics for groups providing hospital-based services probably contributed to reduced after-hours care and possibly higher rates of emergency department visits.

At the time the blended capitation model was introduced, selection of primary care residency positions by medical students was at an all-time low,²⁰ reimbursement of primary care physicians was a fraction of that paid to specialists,²¹ satisfaction with professional life was low,²² and the number of underserviced communities had almost doubled.²³ Many of these situations have improved since then, perhaps in part due to primary care reform. From that perspective, increased reimbursement to primary care physicians, even without attending changes in practice, may have been an appropriate policy direction. Also, payers have more predictable costs under a capitation model than under a fee-for-service model. As well, team-based care may be easier to implement when physicians are not dependent on fee-for-service payments. In fact, a new team-based model of care based in large part on the capitation model was just being implemented during the period of our study.

There is little evidence available from other countries on changes in access to care under capitation models. A systematic review revealed inconsistent evidence about changes in access to care and health care utilization between capitation and fee-for-service models.⁶ A comparative Canadian study in the 1990s found no change in the use of hospital services between blended capitation and matched fee-for-service practices.²⁴ More recent studies in the United States that compared capitation and fee-for-service models reported conflicting findings about the provision of discretionary care,²⁵ rates of “ambulatory care sensitive” hospital admissions (admissions that could have been avoided through timely ambulatory care)²⁶ and access to care²⁷ under capitation.

An analysis of the strengths and weaknesses of the models suggests that no single model can achieve the full range of policy objectives.²⁸ Information that would guide policy-makers about the blending of different elements with capitation, adjustment of capitation rates, incentives and disincentives for care outside the model, and other model elements to achieve improved access is extremely limited.

A recent study found that rates of use of emergency department services were lower in capitation practices than in enhanced fee-for-service practices. However, the findings were based on self-report and examined a small number of groups in only one city.²⁹ Our findings were based on actual use of emergency department services and included data for the entire province of Ontario. Both administrative data³⁰ and physician surveys³¹ have shown that, on average, primary care physicians in rural areas provide more emergency care and hospital-based care than do physicians in urban areas. These studies also showed a greater scope of practice in rural areas, a finding not reflected in our mostly office-based measure of comprehensiveness of care. In our study we found the mean number of visits to emergency departments was much higher in rural areas than in urban areas, a finding also documented by others.^32,33

Limitations

Our study had limitations. First, and largest, was the dependence on administrative data. However, because we collected billing data based on fee codes that are used to pay physicians, we feel that the data were reasonably complete. Physicians in the capitation model, however, bill fee-for-service but are paid only 10% on claims; it is not yet known whether capitation claims are as complete as fee-for-service claims. Incomplete billing claims for after-hours care by physicians in capitation practices would appear as reduced provision of after-hours care in our data.

Second, patient enrolment is required under the capitation model but is optional under the enhanced fee-for-service model. If a smaller proportion of patients were enrolled in enhanced fee-for-service practices than in capitation practices, and if patients with frequent visits were more likely to be enrolled, the result may have been sicker patients enrolled in the enhanced fee-for-service practices than in the capitation practices.

Third, we limited patients to those enrolled for the entire study year. However, patients continued to be enrolled during that period. Further research involving these practices over an extended study period would be warranted. Ontario has 43 urban and 11 rural community health centres that serve high-need populations but for which data are not available; this potentially contributed to the skewing of socioeconomic status in the practices included in our study.

Fourth, we did not compare the capitation and enhanced fee-for-service models with the other models of primary care reform in Ontario or with the straight fee-for-service plan. Data for the other models are either incomplete in Ontario or relate to models undergoing rapid change. Also, many primary care physicians who remain in the straight fee-for-service pool have practices that focus on specific aspects of care (e.g., sports medicine, palliative care or care of elderly people) such that they are not comparable with practices providing comprehensive care in patient enrolment models.

Conclusion

The capitation and enhanced fee-for-service models were comparable in terms of physician and patient characteristics. Both models were skewed toward patients with higher incomes. They were also comparable in terms of comprehensiveness and continuity of care. However, compared with the enhanced fee-for-service practices, the capitation practices had fewer sick patients, provided less after-hours care, had higher rates of use of emergency department services and enrolled fewer new patients. The differences in the practice characteristics between the 2 models appeared to be pre-existing rather than due to the conversion to the new capitation reimbursement model. Although the capitation model provides an alternative to fee-for-service practice, its characteristics should be the focus of future policy development and research.