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In October 2015, the Centers for Medicare & Medicaid Services transitioned from the 9th version of the International Classification of Diseases (ICD-9) codes for reporting patient diagnosis and medical procedures to the 10th version (ICD-10). The multitude of coding options for total joint arthroplasty in ICD-10-procedural coding (ICD-10-PCS) poses some challenges for the American Joint Replacement Registry (AJRR) in identifying precise procedures being reported. While AJRR participating hospitals are familiar with ICD-10-PCS, this new coding may not have been introduced to most AJRR participating surgeons. To address these issues, AJRR initiated an ICD-10 workgroup to define and map appropriate ICD-10 codes to total joint procedure types. This initiative sought to improve accuracy of AJRR data. Keywords: ICD-10-PCS codes, Total joint arthroplasty, Clinical data registry