Authentication of Algorithm to Detect Metastases in Men with Prostate Cancer Using ICD-9 Codes

Table 1

Validity of diagnoses codes of metastases to prostate cancer.

		Medical chart review
	Claims	Yes	No
Algorithm A	Yes	58	0
(ICD 198.5 or 198.3 or 197.0 or 197.7)	No	3	231
	Total	61	231
	Sensitivity	58/61 = 0.95 (0.86, 0.99)
	Specificity	231/231 = 1 (0.98, 1.00)
	PPV	58/58 = 1 (0.94, 1.00)
	NPV	231/234 = 0.99 (0.96, 0.99)
Algorithm B	Yes	55	0
(ICD 198.5)	No	6	231
	Total	61	231
	Sensitivity	55/61 = 0.90 (0.80, 0.96)
	Specificity	231/231 = 1 (0.98, 1.00)
	PPV	55/55 = 1 (0.94, 1.00)
	NPV	231/237 = 0.97 (0.95, 0.99)