Table 1.
Positive Predictive Value (PPV) and Confidence Intervals for stroke and acute myocardial infarction ICD9-CM codes
| ICD9-CM code and definition | Reviewed N (%) | Confirmed as New Case | PPV (95% CIs) |
|---|---|---|---|
| Ischemic/Thrombotic Strokes Total | 226 (100) | 183 | 80.9 (75.3, 85.6) |
| Cerebral artery occlusion, unspecified with infarction (434.91) | 118 (52.2) | 107 | 90.7 (84.1, 94.7) |
| Acute, but ill-defined, cerebrovascular disease (436) | 30 (13.3) | 20 | 66.7 (48.8, 80.8) |
| Occlusion of carotid artery with infarction (433.11) | 22 (9.7) | 11 | 50.0 (30.7, 69.3) |
| Occlusion of multiple arteries with infarction (433.31) | 7 (3.1) | 6 | 85.7 (48.7, 97.4) |
| Occlusion of cerebral arteries with infarction (434.01) | 6 (2.7) | 5 | 83.3 (43.6, 97.0) |
| Occlusion of pre cerebral arteries with infarction (433.01) | 2 (0.9) | 2 | 100 (34.2, 100) |
| Occlusion of vertebral artery with infarction (433.21) | 1 (0.4) | 1 | 100 (20.7, 100) |
| Occlusion/stenosis of other specified pre cerebral artery with infarction (433.81) | 1 (0.4) | 1 | 100 (20.7, 100) |
| Hemorrhagic Strokes | |||
| Intracerebral Hemorrhage (431) | 18 (8.0) | 14 | 77.8 (54.8, 91.0) |
| Subarachnoid Hemorrhage (430) | 6 (2.7) | 3 | 50.0 (18.8, 81.2) |
| Embolic Strokes | |||
| Cerebral Embolism with infarction (434.11) | 14 (6.2) | 13 | 92.9 (68.5, 98.7) |
| Cerebral Embolism (Embolic Stroke) (434.1) | 1 (0.4) | 0 | 0 (0, 79.3) |
| Acute Myocardial Infarction Total | 174 (100) | 156 | 89.7 (84.2, 93.4) |
| Subendocardial infarction (NSTEMI) (410.7) | 124 (71.2) | 112 | 90.3 (84.2, 93.4) |
| ST elevation MI of other inferior wall (410.4) | 13 (7.5) | 12 | 92.3 (66.7, 98.6) |
| Acute Myocardial infarction unspecified site (410.9) | 11 (6.3) | 7 | 63.6 (35.4, 84.8) |
| ST elevation MI of other anterior wall (410.1) | 10 (5.7) | 9 | 90.0 (59.6, 98.2) |
| ST elevation MI of other specified sites (410.8) | 9 (5.2) | 9 | 100 (70.1, 100) |
| ST elevation MI of anterolateral wall (410.0) | 4 (2.3) | 4 | 100 (51.0, 100) |
| ST elevation MI of inferolateral wall (410.2) | 1 (0.6) | 1 | 100 (20.7, 100) |
| ST elevation MI of inferoposterior wall (410.3) | 1 (0.6) | 1 | 100 (20.7, 100) |
| ST elevation MI of other lateral wall (410.5) | 1 (0.6) | 1 | 100 (20.7, 100) |