Table 5.
Number of Participants Without Coronary Heart Disease (CHD) Claims in Medicare and Percentage Reporting CHD in 2-Year Look-Back Periods, by CHD Claims Algorithm, REGARDS Study, 1999–2007
| CHD History Claims Algorithm | 2-Year Fixed-Window Look-Back Period |
≥2-Year All-Available Look-Back Period |
||
|---|---|---|---|---|
| No. Without CHD Claims | % Reporting CHDa | No. Without CHD Claims | % Reporting CHDa | |
| Base algorithmb | 6,756 | 12.9 | 6,411 | 8.9 |
| Base algorithm or ≥1 inpatient or ≥2 E/M outpatient claims with ICD-9 code 410 | 6,751 | 12.8 | 6,407 | 8.8 |
| Base algorithm or ≥1 inpatient or ≥2 E/M outpatient claims with ICD-9 code 410 or 411 | 6,714 | 12.7 | 6,343 | 8.7 |
| Base algorithm or ≥1 inpatient or ≥2 E/M outpatient claims with ICD-9 code 410, 411, or 413 | 6,618 | 12.3 | 6,177 | 8.0 |
| Base algorithm or ≥1 inpatient or ≥2 E/M outpatient claims with ICD-9 code 410, 411, 413, or 414 | 5,854 | 6.4 | 5,438 | 4.1 |
| Base algorithm or ≥1 inpatient or ≥1 E/M outpatient claim with ICD-9 code 412 | 6,700 | 12.4 | 6,357 | 8.4 |
| Base algorithm or ≥1 inpatient or ≥1 E/M outpatient claim with ICD-9 code 410 or 412 | 6,685 | 12.3 | 6,335 | 8.3 |
| Base algorithm or ≥1 inpatient or ≥1 E/M outpatient claim with ICD-9 code 410, 411, or 412 | 6,596 | 12.0 | 6,193 | 7.9 |
| Base algorithm or ≥1 inpatient or ≥1 E/M outpatient claim with ICD-9 code 410, 411, 412, or 413 | 6,391 | 11.3 | 5,893 | 7.2 |
| Base algorithm or ≥1 inpatient or ≥1 E/M outpatient claim with ICD-9 code 410, 411, 412, 413, or 414 (expanded algorithm) | 5,446 | 4.9 | 4,999 | 3.4 |
| Base algorithm or cardiologist visit | 5,199 | 7.7 | 4,646 | 5.6 |
| Base algorithm or ≥1 inpatient or ≥2 E/M outpatient claims with ICD-9 code 410, 411, 413, or 414 or cardiologist visit | 4,904 | 5.5 | 4,325 | 3.6 |
Abbreviations: CHD, coronary heart disease; E/M, evaluation and management; ICD-9, International Classification of Diseases, Ninth Revision; REGARDS, Reasons for Geographic and Racial Differences in Stroke.
a Self-reported CHD was defined as reporting a previous myocardial infarction or coronary revascularization.
b The base algorithm identified persons with CHD claims containing ICD-9 codes for myocardial infarction or ICD-9 and Current Procedural Terminology codes for coronary revascularization (see text for details).