Table 1.
Identified and Confirmed Nonmelanoma Skin Cancer Cases with Sensitivity, Specificity, Negative (NPV) and Positive Predictive Values (PPV), 2007-2008, All-Payer Claims Data.
| Identification Algorithm |
True Positive Cases |
Identified Cases by Algorithm |
Confirmed True Cases Identified by Algorithm |
Sensitivity (95% CI) |
Specificity (95% CI) |
NPV (95% CI) |
PPV (95% CI) |
|---|---|---|---|---|---|---|---|
| ICD-9-CM code alone |
4883 | 5995 | 3128 | 64.1 (62.7-65.4) |
85.1 (84.6-85.6) |
90.3 (89.9-90.8) |
52.2 (50.9-53.4) |
| CPT code alone |
4883 | 5541 | 3078 | 63.0 (61.7-64.4) |
87.2 (86.8-87.7) |
90.3 (89.9-90.7) |
55.5 54.2-56.9) |
| Both ICD-9- CM and CPT codes |
4883 | 3441 | 2335 | 47.8 (46.4-49.2) |
94.3 (93.9-94.6) |
87.7 (87.3-88.2) |
67.9 (66.3-69.4) |
NPV, Negative Predictive Value; PPV, Positive Predictive Value; CI, Confidence Interval; ICD-9-CM, International Classification of Diseases, 9th Revision, Clinical Modification; CPT, Current Procedural Terminology.
Study Population: large integrated health system, All-payer Health Plan patients, southeastern MI USA.
Standard: Co-Path3 electronic histopathology data.
Total Skin Pathology Cases: 24, 164