Table 4.

Agreement between claims algorithm and operative reports for partial versus radical nephrectomy

		PROCEDURE BASED ON OPERATIVE REPORT
		Partial Nephrectomy	Radical Nephrectomy	Total
PROCEDURE BASED ON MEDICARE CLAIMS	Partial Nephrectomy	16	1	17
	Radical Nephrectomy	1	102	103
	Total	17	103	120
Observed agreement = 98.3%
Sensitivity† = 94.1% (71.3%–99.9%)
Specificity† = 99.0% (94.7%–99.9%)
Positive Predictive Value† = 94.1% (71.3%–99.9%)
Negative Predictive Value† = 99.0% (94.7%–99.9%)

† Calculations are for identification of partial nephrectomies based on the operative report (medical record) as the reference-standard