External validation of a claims-based algorithm for classifying kidney-cancer surgeries

Table 5 Agreement between claims algorithm and operative reports for laparoscopic versus open kidney cancer surgeries

		PROCEDURE BASED ON OPERATIVE REPORT
		Laparoscopy	Open Surgery	Total
PROCEDURE BASED ON MEDICARE CLAIMS	Laparoscopy	11	1	12
	Open Surgery*	2	106	108
	Total	13	107	120
Observed agreement = 97.5%
Sensitivity ^† = 84.6% (54.6%–98.1%)
Specificity ^† = 99.0% (94.9%–99.9%)
Positive Predictive Value ^† = 91.7% (61.5%–99.8%)
Negative Predictive Value ^† = 98.1% (93.5%–99.8%)

† Calculations are for identification of laparoscopic cases based on the operative report (medical record) as the reference-standard
* includes one percutaneous ablative procedure

ISSN: 1472-6963