National Carriers Net 80% of 500,000 MA Sign-Ups During Open Enrollment Period

Medicare Advantage enrollment grew by more than 507,000 lives during the 2023 Open Enrollment Period (OEP), according to CMS’s May data release and AIS’s Directory of Health Plans. That’s a significant increase from last year’s OEP, when plans added about 230,000 new members from February to May 2022. The news comes just weeks after a KFF analysis found that the number of seniors enrolled in MA vs. original Medicare officially crossed the 50% threshold.

© 2025 MMIT
Carina Belles

Carina Belles

Carina has been covering public-sector health care since 2018. As a data reporter for Radar on Medicare Advantage, she creates infographics and data stories on issues impacting Medicare, Medicaid and Part D. She also develops AIS Health Daily, a free daily newsletter that showcases AIS’s strong reporting across our four publications and parent company Norstella’s suite of market access and data solutions. Prior to joining the editorial team, she managed Medicare and Medicaid data for the Directory of Health Plans, AIS’s industry-standard health coverage database. She graduated from Ohio University with a B.S. in Journalism.

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