Medicare administrative claims data are useful for monitoring service utilization – including hospitalizations, home health and physician office visits. Claims generally take many months to be considered ‘final' – and be mature enough that the data produce stable estimates of service use, reasons for service, and payments. However, timely information allows investigators to monitor the progress of programs and interventions, enabling mid-course adjustments to improve results.

The objective of this document is to describe the completeness of Medicare Institutional fee-for-service (FFS) claims, Medicare Non-Institutional FFS claims, and Part D Events (PDEs) at different levels of claims maturity (i.e., after different amounts of time have elapsed from the service date to the claim processing date).