The transition from the International Classification of Diseases, Ninth Revision (ICD-9) to the Tenth Revision (ICD-10) in 2015 improved characterization of procedural details.1 For example, coronary artery bypass grafting (CABG) was described by only 10 ICD-9 codes, whereas more than 200 CABG-associated ICD-10 codes are now available. Comparison of Current Procedural Terminology (CPT) codes, which did not change in 2015, with ICD-9 codes describing the same CABG procedure may provide useful context to understand the transition from ICD-9 to ICD-10. We developed an algorithm to determine procedural details of CABG documented by ICD-9 and ICD-10 and CPT codes and then applied the algorithm to Medicare beneficiaries undergoing CABG in 2015 to evaluate for changes in coding patterns.
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Schaffer JM, Squiers JJ, Banwait JK, et al. Differences in Administrative Claims Data for Coronary Artery Bypass Grafting Between International Classification of Diseases, Ninth Revision and Tenth Revision Coding. JAMA Cardiol. Published online June 09, 2021. doi:10.1001/jamacardio.2021.1595
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