Match Rates Between Home Health Assessment and Medicare Claims Data

Has the linkage between Outcome and Assessment Information Set (OASIS) assessments and Medicare enrollment and claims remained stable from 2017 to 2023, and what does this suggest for measuring home health use and outcomes?In this cohort study of a US national analysis of 18 million OASIS assessments per year, the share linked to a Medicare beneficiary decreased from approximately 90% in 2017 to 76% in 2023, and the proportion of fee-for-service home health claims with a corresponding OASIS assessment decreased from approximately 97% to 74% over the same period.Results of this study suggest that researchers should interpret with caution any analyses linking OASIS with Medicare data unless a corrected beneficiary identifier is made available by the Centers for Medicare & Medicaid Services.

Corresponding Author: Momotazur Rahman, PhD, Department of Health Services, Policy and, Practice, Brown University, 121 S Main St, S-6, Providence, RI 02912 (momotazur_rahman@brown.edu).

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