Relationship Between Medication Adherence and Other Medicare Star Rating Measures

AJMC November 7, 2025
Eric P. Borrelli, PhD, PharmD, MBA, Peter Saad, PharmD, MBA, Nathan E. Barnes, PharmD, MHA, Idal Beer, MD, MBA, MPH, Julia D. Lucaci, PharmD, MS

Performance on Medicare Star Ratings medication adherence measures is significantly tied to performance on the intermediate outcome and statin process measures.

ABSTRACT

Objectives: To assess the interrelation between Medicare Star Ratings medication adherence measures and other intermediate and process measures.

Study Design: A cross-sectional analysis was performed of the annual Medicare Star Ratings health plan performance data from Star Ratings years 2015-2025. The analysis evaluated the potential relationship between (1) renin-angiotensin system antagonist (RASA) adherence and controlling blood pressure, (2) noninsulin antidiabetic adherence and controlling blood glucose, (3) statin adherence and statin therapy for patients with cardiovascular disease (CVD), and (4) statin adherence and statin use in persons with diabetes (SUPD).

Methods: The outcomes of interest were ORs and 95%...

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