Accessibility to Oral Antiviral Therapy for Patients with Chronic Hepatitis C in the United States

Abstract

Background: Hepatitis C (HCV) direct acting antiviral agents (DAAs) are safe, effective, and tolerable. Most contraindications to interferon-based treatment are no long applicable. The aims of this study were to understand the predictors of approval to drug accessibility.

Methods: We studied all consecutive patients with HCV prescribed DAAs between October 2014 and July 2015. Data on demographic, socio-economic status, comorbidities, baseline laboratory values, and assessment of liver disease severity, insurance, and specialty pharmacy type were collected. Multivariate analyses were performed to identify predictors of prescription approval.

Results: In total, 410 patients were prescribed DAAs between October 2014 and July 2015. Of those, 332 (81%) patients were insurance approved for therapy. Of the 332 patients accepted, 251 were accepted after the first prescription attempt, and 38 were accepted after the second and third attempts. The number of attempts for the other 43 approved patients was unknown. Older age (p = 0.001), employment (p = 0.001), lack of comorbidities (p = 0.02), liver transplantation (p = 0.018), and advanced liver disease (p = 0.001) were more likely associated with obtaining approval. Household income was not associated with insurance approval. In the multivariate analysis, Medicare insurance (odds ratio [OR]) 2.67, 95% confidence interval [CI] 0.96–7.20), lack of nonliver comorbidities (OR 2.72, 95% CI 1.35–5.43), and the presence of advanced liver disease (OR 1.82, 95% CI 1.04–3.24) independently predicted drug approval.

Conclusion: Despite the availability of DAAs for HCV, barriers from insurance carriers continue to impair widespread use. Patients with advanced liver disease, Medicare, and without comorbidities are most likely to be insurance approved for DAAs.

Introduction

Up to 5–7 million Americans are believed to be infected with chronic hepatitis C (HCV) Most of these individuals are unaware of their disease and are in the baby-boomer age group.1 Chronic hepatitis C infection is an important medical concern that has both hepatic and extrahepatic manifestation.2 The viral infection can lead to cirrhosis, hepatocellular carcinoma (HCC), and liver failure.2–4 Indeed, HCV is the most common indication for liver transplantation in the United States.5 Extrahepatic manifestations, such as cryoglobulinemia and kidney disease, are also important causes of morbidity and mortality.6,7

Achieving a sustained viral response (SVR) is associated with a number of improved clinical outcomes, including liver-related outcomes and overall survival.8,9 Interferon has been the cornerstone of antiviral therapy for almost 2 decades.10 However, its utility is limited by a number of contraindications, such as uncontrolled depression and autoimmune disorders.11,12 The introduction of all-oral direct-acting agents (DAAs) has revolutionized the treatment of HCV.13,14 Compared to interferon, DAAs have been shown to increase SVR and improve tolerability compared to interferon. Few serious adverse effects are seen with DAAs, and rarely do patients discontinue use of DAAs due to adverse effects.15

Antiviral therapy with DAAs has been not only been demonstrated to be safer, more effective, and better tolerated than interferon-based therapy but also more cost effective.16–20 Nevertheless, DAAs are expensive and access to these drugs is not guaranteed. Thus, we examined the accessibility of these drugs to patients with HCV. We hypothesized that there are substantial barriers to HCV antiviral therapy for patients, even after specialty referral.

Patient and Methods

Study populations

Consecutive HCV patients treated with DAAs at the University of California Los Angeles (UCLA) since the approval of sofosbuvir/ledipasvir were identified through an administrative UCLA database. The study period was between October 2014 and July 2015. We collected demographic information, such as gender, age, and ethnicity. Baseline laboratory, radiological, and histological results, as applicable, were also recorded. Laboratory tests were obtained within 30 days of the prescription being sent to pharmacy. Liver disease severity, defined through clinical findings, laboratory tests, liver biopsy, and/or radiological evaluation, was classified as either advanced (stage 3–4) or nonadvanced (stages 0–2). Decompensated manifestations were defined by the presence of ascites, encephalopathy, variceal bleeding or esophageal varices without bleeding, liver cancer, or jaundice. Extrahepatic manifestations were defined by the presence of debilitation/fatigue, type 2 diabetes mellitus, porphyria cutanea tarda, cryoglobulinemia, lymphoma, or vasculitis. Nonliver comorbidities were defined by the presence of cardiopulmonary disease, hemodialysis, stroke, non-HCC malignancy, human immunodeficiency virus (HIV), and diabetes.

Generally, prescriptions were sent to specialty pharmacies. These pharmacies were responsible for the completion of authorization forms and, if necessary, appeals for drug approvals. Insurance carrier and specialty pharmacy were noted. Pharmacies were stratified in our analysis according to whether they were privately or publically owned (company traded on a stock exchange). The stratification of pharmacies was important to exclude effort bias by the two types of pharmacies. Patient income was estimated by residential zip code and zip code tabulation area (ZCTA) through the United States Census Bureau.21 The study was approved by the Institutional Review Board. Patient consent was not required since this was a retrospective analysis. There was no funding for this study.

Outcomes

Our main outcome was insurance approval for oral antiviral therapy. We recorded prescription approval or denial for each patient. The time between prescription submission and the pharmacy’s decision was recorded. The number and the decision of appeals were also documented. Generally, prescription packets containing necessary study results and clinical information, including indication for antiviral therapy, were sent to specialty pharmacies. If the insurance provider declined drug approval, it was our practice to appeal the decision up to two times.

Statistical Analysis

Data are presented as mean ± standard deviation (SD), median with interquartile range (IQR), or number in group with percent of group based on the distribution of the data. Univariate analysis was performed using a t-test for normally distributed continuous data, Wilcoxon-Rank Sum test for non-normally distributed continuous data, and Fisher’s exact test or Chi-sqaure test for discrete data. We used a multivariate logistic regression model to derive adjusted odd-ratios (OR) for predictors of patients that were approved for DAAs by their insurance provider. The multivariate logistic regression model was built using variables with a p value below 0.10 on univariate analysis. All tests were two-sided, and a p value below 0.05 indicated statistical significance. The R Statistical Programming Environment was used to conduct analysis (R Core Team Vienna, Austria).

Results

During our study period, 410 patients were prescribed all oral antiviral therapy. Baseline demographic information is found in Table 1. The mean age (± SD) of our cohort was 59.6 (± 10.9) years. The majority of patients were male. Almost 50% of our cohort was unemployed, and most patients were insured with Medicare. Less than 10% of the patient cohort had a nonliver related comorbidity. Extrahepatic manifestations were found in over a quarter of patients, and 22.4% of patients had some manifestation of hepatic decompensation. Almost 20% of the patient cohort was transplant recipients. Of the employed patients, most had incomes between $50,000 and $100,000.

Table 1. Demographics and baseline results.

	Overall n/N (%)	Approved n/N (%)	Denied n/N (%)
Characteristics	N = 410	N = 332	N = 78	OR	95% CI	p-Value
Mean age - years	59.6 (10.9)	60.5 (10.5)	55.6 (11.7)			0.001
Gender						1
Female	172/410 (42%)	139/332 (41.9%)	33/78 (42.3%)	Reference
Male	238/410 (58%)	193/332 (58.1%)	45/78 (57.7%)	1.02	0.61–1.67
Work status						0.001
Disabled	103 (25.1%)	92 (27.7%)	11 (14.1%)	Reference
Employed	193 (47.1%)	143 (43.1%)	50 (64.1%)	0.34	(0.16–0.67)
Retired	86 (21%)	77 (23.2%)	9 (11.5%)	1.02	(0.4–2.66)
Unemployed	28 (6.8%)	20 (6%)	8 (10.3%)	0.3	(0.11–0.86)
Non-Liver comorbidities	59/410 (14.4%)	41/332 (12.3%)	18/78 (23.1%)	0.47	0.26–0.89	0.02
Co-existent Liver Diseases	20/410 (4.9%)	14/332 (4.2%)	6/78 (7.7%)	0.53	0.2–1.53	0.238
Extra-hepatic manifestations	116/410 (28.3%)	91/332 (27.4%)	25/78 (32.1%)	0.8	0.47–1.38	0.406
Hepatic decompensations	84/410 (20.5%)	74/332 (22.3%)	10/78 (12.8%)	1.95	1.0–4.2	0.063
HCC	4 (1%)	2 (0.6%)	2(2.6%)	0.23	0.03–1.94	0.165
Liver transplant recipient	83/410 (20.2%)	75/332 (22.6%)	8/78 (10.3%)	2.55	1.24–5.97	0.018
Severity of Liver Disease (Non-transplant)						0.001
Advanced	152/327 (46.5%)	131/257 (51%)	21/70 (30%)	Reference
Non-advanced	175/327 (53.5%)	126/257 (49%)	49/70 (70%)	0.42	0.24–0.7
Income						0.2
< 50,000	88/399 (22%)	74/322 (23%)	14/77 (18.2%)	Reference
50,000–100,000	266/399 (66.7%)	216/322 (67.1%)	50/77 (64.9%)	0.82	0.41–1.53
> 100,000	45/399 (11.3%)	32/322 (9.9%)	13/77 (16.9%)	0.47	0.2–1.11
Percent below poverty, median (IQR)	11.1 (8.2–18.2)	11.8 (8.2–18.6)	10.3 (7.9–15.9)	1.02	0.99–1.06	0.172
Pharmacy	N = 410	N = 332	N = 78			0.602
Privately owned	149/410 (36.3%)	123/332 (37%)	26/78 (33.3%)	Reference
Publically traded	261/410 (63.7%)	209/332 (63%)	52/78 (66.7%)	0.85	0.5–1.42
Type of insurance						< 0.001
Medicaid	45 (11%)	36 (10.8%)	9 (11.5%)	Reference
Medicare	166 (40.5%)	153 (46.1%)	13 (16.7%)	2.94	(1.14–7.37)
Non-Medicaid HMO	54 (13.2%)	42 (12.7%)	12 (15.4%)	0.88	(0.32–2.3)
PPO	145 (35.4%)	101 (30.4%)	44 (56.4%)	0.57	(0.24–1.25)
Days from Rx request to Insurance Decision Median (IQR) - days	10 (3–27)	8 (2–24)	16 (5–54)	0.99	0.99–1	0.001

Abbreviations: PPO, Preferred Provider Organization; HMO, Health Maintenance Organization; CPD, Cardiopulmonary Disease; HCC, Hepatocellular Carcinoma; IQR, Interquartile Range.

Of the nontransplant recipients, 58.7% of the patients were classified as having advanced liver disease. Baseline laboratory test values are shown in Table 2. Genotype 1 was the predominant viral genotype and was found in 85% of patients. The mean HCV viral load was 5,430,135 IU/mL. The mean aspartate aminotransferase (AST), alanine aminotransferase (ALT), total bilirubin, and platelet count were 63 IU/mL, 70 IU/mL, 0.88 mg/dL, and 170 × 10³/µL respectively.

Table 2. Baseline laboratory results.

Overall n/N (%)	Approved n/N (%)	Denied n/N (%)
Characteristics	N = 410	N = 332	N = 78	OR	95% CI	p-Value
Genotype						0.803
1	349/410 (85.1%)	283/332 (85.2%)	66/78 (84.6%)	Reference
2	22/410 (5.4%)	19/332 (5.7%)	3/78 (3.8%)	1.48	0.49–6.42
3	30/410 (7.3%)	23/332 (6.9%)	7/78 (9.0%)	0.77	0.33–2
4	9/410 (2.2%)	7/332 (2.1%)	2/78 (2.6%)	0.82	0.19–5.56
Viral load (IU/mL) Median (IOR)	2,010,000 (579,500–5,405,000)	2,100,000 (57,8750–5,585,000)	1702,612 (662,000–4,310,000)	–	–	0.579
AST (U/L) Median (IQR)	46.5 (32–76.2)	48 (31–77)	45 (35.2–72.8)	–	–	0.644
ALT (U/L) Median (IQR)	54 (32–89)	54 (30–89.5)	58.5 (39–87.8)	–	–	0.197
Bilirubin, Total (mg/dL) Median (IQR)	0.5 (0.4–0.8)	0.6 (0.4–0.8)	0.5 (0.4–0.9)	–	–	0.37
Alkaline phosphatase (U/L) Median (IQR)	83 (63–111)	86 (65.2–114)	73 (59.2–100)	–	–	0.027
Albumin (g/dL) Median (IQR)	4.3 (3.8–4.5)	4.2 (3.8–4.4)	4.4 (4–4.6)	–	–	0.002
Platelet count (x10E3/uL) Median (IQR)	169 (109.5–227)	161 (103–223)	181 (141.5–238.5)	–	–	0.019
Creatinine (mg/dL) Median (IQR)	0.9 (0.8–1.1)	0.9 (0.8–1.1)	0.8 (0.7–1)	–	–	0.077
INR Median (IQR)	1.1 (1.1–1.2)	1.1 (1–1.2)	1.1 (1.1–1.2)	–	–	0.89

Abbreviations: AST, Aspartate Transaminase; ALT, Alanine Transaminase; INR, International Normalized Ratio; IQR, Interquartile Range.

Fig. 1. Flow chart of approvals and denial for patients with timeline of attempts.

The insurance approval rate for our cohort was 81.0% (332/410), and 36.3% and 63.7% of the prescriptions were sent to privately and publically owned pharmacies, respectively. Of the 332 patients approved for therapy, 251 were approved without the need for appeal to the insurance company. Thirty-four were approved after one appeal, and four were approved after the second appeal. Information on the time from submission to insurance decision was known in 368 patients, and the mean (± SD) time from submission to drug approval was 28.1 (± 46.0) days. Patients with Medicaid were less likely to be approved and waited the longest for the final decision (Fig. 2). The likelihood of drug therapy approval varied according to insurance plan: Medicaid (80%, 36/45), Medicare (92%, 153/166), non-Medicaid health maintenance organization (HMO) (78%, 42/54), and preferred provider organization (PPO) (70%, 101/145). Drug therapies are shown on Table 3.

Fig. 2. Time to decision by insurance type.

Table 3. Treatment regimens.

Characteristics	Overall	Approved n/N (%)	Denied n/N (%)
Treatment regimen		N = 332	N = 78
Ledipasvir/Sofosbuvir	324	261/332(78.6%)	63/78 (80.8%)
Ledipasvir/Sofosbuvir + Ribavarin	39	30/332 (9.0%)	9/78 (11.5%)
Sofosbuvir + Ribavarin	37	33/332 (9.9%)	4/78 (5.1%)
Sofosbuvir + Simeprevir	2	1/332 (0.3%)	1/78 (1.3%)
3D	12	6/332 (1.8%)	6/78 (7.7%)
3D + Ribavarin	3	1/332 (0.3%)	2/78 (2.6%)

Abbreviation: 3D, Ombitasvir-Paritaprevir-Ritonavir and Dasabuvir.

Predictors of approval were age (p = 0.001), work status (p = 0.001), lack of comorbidities (p = 0.02), liver transplantation (p = 0.018), and severity of liver disease (p = 0.001). The results of multivariate analysis identified Medicare insurance (OR 2.67, 95% confidence interval [CI]), lack of comorbidities (OR 2.72, 95% CI 1.35–5.43), and the presence of advanced liver disease (OR 1.82, 95% CI 1.04–3.24) as independent predictors of drug approval (Table 4).

Table 4. Results of multivariate analysis.

Characteristics	OR	95% CI	p-value
Age (years)	1.02	0.99–1.04	0.261
Work status			0.354
Disabled	Reference
Employed	0.56	0.24–1.26
Retired	0.68	0.24–2.01
Unemployed	0.37	0.12–1.17
Insurance			0.023
Medicaid HMO	Reference
Medicare	2.66	0.96–7.2
Non-Medicaid HMO	1.11	0.39–3.1
PPO	0.78	0.31–1.82
Lack of comorbidities	2.72	1.35–5.43	0.006
Extrahepatic manifestations	0.74	0.41–1.34	0.313
Liver transplant recipient	1.85	0.85–4.46	0.123
Stage of fibrosis			0.035
Non-advanced fibrosis	Reference
Advanced fibrosis	1.82	1.04–3.24

Abbreviations: PPO, Preferred Provider Organization; HMO, Health Maintenance Organization.

Discussion

The results of our study demonstrate the insurance accessibility limitations for patients with chronic hepatitis C infection in our practice. The overall insurance approval was 81%. Predictors of approval were age, work status, liver transplantation, type of insurance, severity of liver disease, and the lack of medical comorbidities. The presence of extrahepatic manifestations, hepatic decompensation, HCC, and other co-existent liver diseases were not found to be associated with the likelihood of obtaining DAAs. Initially, the American Association for the Study of Liver Diseases (AASLD)/Infectious Diseases Society of America (IDSA) joint guidance recommended prioritization of patients with HCV and highlighted liver transplant recipients and patients with severe liver damage as a highest prioritization. More recently, the same joint guidance recommended all patients should be treated for HCV because of the potential for extrahepatic manifestations.22

Several other studies have also highlighted the insurance barriers to obtaining DAAs. For instance, the study by Do et al. described an overall insurance approval of 77.5%.23 The major predictors of drug approval were public insurance and advanced liver disease. In contrast, our study stratified patients based on public insurance and found there was a substantive difference between patients with Medicaid and Medicare insurances. The results of a separate study by Re et al., which was recently presented at the AASLD national meeting, revealed an insurance approval of 84%.24 Similar to our findings, they found a high denial rate for DAAs therapy in patients with Medicaid insurance. In addition, patients with Medicare insurance generally had higher approval rates.

Patients with Medicare were more likely than any other insurance to be approved for DAAs. Of the 166 patients with Medicare, 153/166 (92.2%) were approved for treatment. The ease of Medicare patients to start antiviral therapy may serve as a disincentive for select insurance carriers to deny patients with the expectation they will be eventually approved. The criteria for drug approval vary across insurance companies. For instance, Medicaid requires a minimal fibrosis stage of 2 to be approved for treatment, whereas a particular PPO insurance company limits the use of DAAs to patients with at least bridging fibrosis assessed only through a liver biopsy and elastrography.25

Although studies have shown consistently that antiviral therapy with DAAs for HCV is cost effective, almost 20% of our patient cohort was declined treatment by the insurance carrier.16–20 A potential reason for this lack of approval is the upfront costs associated with curing hepatitis C. The average wholesale cost for an antiviral therapy course is almost $90,000, and the benefits of curing HCV are not realized for years after SVR is achieved. For instance, the cost effectiveness of treating HBV has been shown, even though the clinical impact is not found for many years, because the treatment costs are amortized.26,27

There are a number of limitations to our study. First, our analysis was limited by the start point of our specialty hepatology clinic. Multiple barriers to therapy exist prior to when the patients walks into our office, and these can be stratified into patient, provider, and system constructs.30–32 Second, the results of our study may not be generalizable to other practices, as the patients in our cohort were prescribed DAAs at an academic center with experienced hepatologists and a dedicated staff. The exclusive use of a specialist, who may have an inherent interest in drug approval, could have influenced the likelihood of DAA approval. Another limitation is the availability of DAAs from all drug formularies and the fluidity of treatment criteria. The large cohort and the long entry study period should hopefully mitigate this limitation and the effects on our results. Lastly, our results pertain to the United Health care system, and the findings cannot be extrapolated to other regions of the World. For instance, in many countries, public, not private, medical insurance predominates. As a result, antiviral therapies are funded by the government and accessibility does not depend on insurance approval.

Despite the effectiveness, safety, and tolerability of DAAs, barriers to access these medications continue, even at specialty hepatology clinics. The results of our study highlight that patients with advanced liver disease, Medicare, and those without comorbidities are most likely to be insurance approved for DAAs.

Abbreviations

3D

ombitasvir-paritaprevir-ritonavir and dasabuvir

AASLD

American Association for the Study of Liver Diseases

ALT

alanine transaminase

AST

aspartate transaminase

CI

confidence interval

CPD

cardiopulmonary disease

DAAs

direct acting agents

HBV

hepatitis B virus

HCC

hepatocellular carcinoma

HCV

hepatitis C virus

HIV

human immunodeficiency virus

HMO

health maintenance organization

IDSA

Infectious Diseases Society of America

INR

International Normalized Ratio

IQR

interquartile range

OR

odds ratio

PPO

preferred provider organization

SD

standard deviation

SVR

sustained viral response

ZCTA

zip code tabulation area