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Append ix J COMPARISON OF THE RELIABILITY OF HCFA MEDICARE RECORDS AND PRIVATE ABSTRACT SERVICE MEDICARE ABSTRACTS FOR SELECTED DIAGNOSES COMMON TO BOTH STUDIES (SOURCE: IOM FIELD DATA) l Weighted percent Percent of of all abstracts abstracts with that each diag- no discrepancy nosis represents Private Private HCFA's service HCFA's service Medicare Medicare Medicare Medicare Diagnosis- ICDA-codes* records records records records . Chronic ischemic 412 . 0; 412 .9 36 . 8 27 . 9 9 . 8 8 . 6 ~ . . heart disease Cerebrovascular 430 . 0-430 .9 58 .5 79 .8 6.9 10.1 diseases Fracture, neck of femur 820.0-820.9 ( 820. 0-820 . 5; 820. 9) 70.5 81.0 2.0 3.7 Cataract 374.0-374.9 97.3 94.3 3.0 7.5 (374.0;374.1; 374.8;374.9) Acute myocardial 410.0-410.9 67.3 67.7 2.4 5.3 infarction (410. 0;410. 1; 410. 9) Inguinal hernia 550 96 . 7 87 . 9 1 . 3 2 .1 without mention of obstruction Diabetes mel1itus 250 . 0-250 . 9 49 . 7 60 . 5 2. 5 2 . 9 (250.0;250.9) Cholelithiasis/ 574.0-574.9; 62.8 74.8 2.0 3.5 cholecystitits 575 *Where diagnostic codes for sampling private abstract service records differed from those in the study of Medicare records, they are in parentheses. 127
