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. Author manuscript; available in PMC: 2017 Mar 1.
Published in final edited form as: Pharmacoepidemiol Drug Saf. 2015 Sep 9;25(3):263–268. doi: 10.1002/pds.3870

Table 2.

Cross-classified results of the ICD-9-CM- and CPT-4-based algorithms for cholecystectomy procedures.

ICD-9-CM-based CPT-4-based Frequency
+ + 26 446 (85.7%)
+ − 2 091 (6.8%)
− + 2 316 (7.5%)
Total 30 853