Completeness and quality of comprehensive managed care data compared with fee-for-service data in national Medicaid claims from 2001 to 2019.

Objective: To evaluate the completeness and quality of Medicaid comprehensive managed care (CMC) data in national MAX/TAF research files.

Study Setting And Design: This observational study compared CMC with fee-for-service (FFS) enrollee data in 2001-2019 Medicaid MAX/TAF inpatient, outpatient, and pharmacy files. Completeness was assessed as the proportion of enrollees with any claim and mean claims per enrollee with any claim.