Medicare Data for Dementia Research: Basics, Nuance, Access

Описание: This inaugural seminar in the CAPRA Curriculum Series launches a two-year training program designed to strengthen population-based research in Alzheimer’s disease and related dementias (AD/ADRD).

Led by the Center to Accelerate Populations Research in Alzheimer’s (CAPRA) Director Dr. Julie Bynum, this session provides a rigorous, practice-oriented overview of how Medicare data can be used — and misused — in dementia research.

Learn more and view other videos in the series at:
https://capra.med.umich.edu/pilot-pro...

Presenter: Julie Bynum
Moderator: Edward Norton

Dr. Bynum begins by grounding viewers in the fundamentals of Medicare as a federally administered insurance program and explaining what claims data truly represent: billing records generated in the course of care delivery. She outlines the structural strengths of Medicare data — near-complete national coverage of adults age 65+, standardized data elements, and broad longitudinal reach — while emphasizing inherent limitations tied to access, incentives, clinical practice variation, and underdiagnosis.

The seminar then moves into the methodological core of the talk:

• How dementia is identified in Medicare claims
• Performance of common algorithms (including one-claim vs. two-claim approaches)
• Positive predictive value, sensitivity, and specificity trade-offs
• Validation studies using Health and Retirement Study (HRS) and Rush Alzheimer’s Disease cohorts
• Sources of false positives and false negatives

Dr. Bynum underscores a critical distinction for investigators: claims data capture diagnosed dementia — not true population prevalence. Diagnostic intensity varies across regions, health systems, and payer types, meaning geographic and policy context can substantially influence observed rates.

The session also examines key sources of nuance that sophisticated investigators must consider:

• Regional variation and diagnosis intensity
• Racial and ethnic differences in diagnosed prevalence
• Care setting effects (hospital, emergency department, nursing home)
• Nursing home residence as a major confounder
• Differences between Traditional Medicare and Medicare Advantage, including financial incentives and selection effects

The seminar concludes with practical guidance on accessing Medicare data through CMS (ResDAC/VRDC) and the NIA LINKAGE Program, including considerations for linked cohort studies.

This session is essential viewing for researchers working with administrative health data in ADRD research. It provides both foundational knowledge and advanced insight into how healthcare systems, policy incentives, and measurement choices shape the data we analyze — and the conclusions we draw.

All CAPRA Curriculum seminars are recorded, transcribed, and made available for ongoing educational use.

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