A Closer Look at the Medicare Part D Landscape

November 22

As of 2023, about 50.5 million Medicare beneficiaries are enrolled in a plan with Part D prescription drug coverage, with 44% in stand-alone Prescription Drug Plans (PDPs) and 56% in Medicare Advantage Prescription Drug Plans (MA-PDs), according to a KFF analysis.

The three largest Part D insurers by market share — UnitedHealth Group, CVS Health Corp. and Humana Inc. — account for 57% of enrollment in 2023. More than half of UnitedHealth’s and Humana’s Part D enrollees chose MA-PDs, while the majority of CVS Health, Centene Corp. and The Cigna Group Part D enrollees are in PDPs.

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Radar on Drug Benefits

Jinghong Chen Reporter

Jinghong has been producing infographics and data stories on employer-sponsored insurance, public health insurance programs and prescription drug coverage for AIS Health’s Health Plan Weekly and Radar on Drug Benefits since 2018. She also manages AIS Health’s annual executive compensation database for top insurers and Blue Cross and Blue Shield affiliates. Before joining AIS Health, she interned at WBEZ, Al Jazeera English and The New York Times Chinese. She graduated from Missouri School of Journalism with a focus on data journalism and international reporting.