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Research Letter
June 9, 2021

Differences in Administrative Claims Data for Coronary Artery Bypass Grafting Between International Classification of Diseases, Ninth Revision and Tenth Revision Coding

Author Affiliations
  • 1Department of Cardiothoracic Surgery, Baylor Scott & White, The Heart Hospital, Plano, Texas
  • 2Baylor Scott & White Research Institute, Plano, Texas
JAMA Cardiol. Published online June 9, 2021. doi:10.1001/jamacardio.2021.1595

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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