Table 1 Chronic disease ascertainment algorithms and their predictive accuracy
Chronic disease | Algorithm | Hospital discharge codes | Physician claim codes (ICD-9) | Cancer registry codes (ICD-O-3) | Cause of death (ICD-9) | Sensitivity (95% CI) | Specificity (95% CI) | |
|---|---|---|---|---|---|---|---|---|
ICD-9 | ICD-10 | |||||||
Congestive heart failure (CHF) [19] | 2 hospitalization records in a 1-year period or 1 physician claim and 1 hospitalization record in a 1-year period or 2 physician claim records in a 1-year period or death certificate cause of death | 428 | I50.0, I50.1, I50.9 | 428 | N/A | 428 | 84.8 (77.7, 92.0) | 97.0 (96.3, 97.9) |
Chronic obstructive pulmonary disease (COPD) [20] | 1 hospitalization record or 1 physician claim records or death certificate cause of death | 491, 492, 496 | J41, J42, J43, J44 | 491, 492, 496 | N/A | 491, 492, 496 | 85.0 (77.0, 91.0) | 78.4 (73.6, 82.7) |
Diabetes [21] | 1 hospitalization record or 2 physician claim records in a 2-year period or death certificate cause of death | 250 | E10, E11, E13, E14 | 250 | N/A | 250 | 86 | 97 |
Lung cancer [22] | 1 cancer registry record in the Ontario Cancer Registry or death certificate cause of death | N/A | N/A | N/A | C34.0, C34.1, C34.2, C34.3, C34.8, C34.9 | 162.2, 162.3, 162.4, 162.5, 162.8, 162.9 | N/A | N/A |
Myocardial infarction (MI) [23] | 1 hospitalization record or death certificate cause of death | 410 | I21 | N/A | N/A | 410 | 95.0 | 88.0 |
Stroke including transient ischemic attack (TIA) [24] | 1 hospitalization record or 2 physician claim records in a 1-year period or death certificate cause of death | 362.3, 430, 431, 434, 435, 436 | G45 (excluding G45.4), H34.0, H34.1, I60, I61, I63 (excluding 163.6), I64 | 432, 435, 436 | N/A | 362.3, 430, 431, 434, 435, 436 | 60.2 (50.7, 69.6) | 99.2 (99.0, 99.5) |