Table 4.
Positive Predictive Value of Combined Case Definitions Plus Anticoagulant Use for Identifying Cases of Cerebral Venous Sinus Thrombosis
| Case Definitions (ICD-10-CM Codes) | TP, n | FP, n | PPV, % (95% CI) |
|---|---|---|---|
| G08, I636, I676 | |||
| G08 or I636 or I676 as primary diagnosis | 53 | 0 | 100.0 (93.3–100.0) |
| G08 or I636 or I676 as primary or secondary diagnosis | 78 | 1 | 98.7 (93.2–100.0) |
| G08 or I636 or I676 as primary, secondary, or tertiary diagnosis | 88 | 1 | 98.9 (93.9–100.0) |
| G08 or I636 or I676 in any field of diagnosis | 99 | 1 | 99.0 (94.6–100.0) |
| G08, I636, I676, I629 | |||
| G08 or I636 or I676 or I629 as primary diagnosis | 54 | 0 | 100.0 (93.4–100.0) |
| G08 or I636 or I676 or I629 as primary or secondary diagnosis | 79 | 1 | 98.8 (93.2–100.0) |
| G08 or I636 or I676 or I629 as primary, secondary, or tertiary diagnosis | 88 | 1 | 98.9 (93.9–100.0) |
| G08 or I636 or I676 or I629 in any field of diagnosis | 99 | 1 | 99.0 (94.6–100.0) |
Abbreviations: TP, true positive; FP, false positive; ICD-10-CM, International Classification of Diseases, 10th Revision, Clinical Modification; PPV, positive predictive value; CI, confidence interval.