Elevance Health and UnitedHealthcare added to their MA membership for 2025, while Humana, Aetna and Centene saw their membership numbers decline. UnitedHealthcare maintained its position as the largest Medicare Advantage insurer, approaching 10 million members.
The overall pace of Medicare Advantage growth slowed in 2025. Compared to February 2024,1.3 million more people are enrolled in MA in 2025, according to CMS data. In 2024, annual enrollment increased by 1.7 million, according to Chartis.
In 2020-2023, annual enrollment in the program increased by 2 million or more.
Here’s how Medicare Advantage insurers fared during open enrollment:
UnitedHealthcare
February 2025 enrollment: 9,924,190
December 2024 enrollment: 9,539,706
Percent change: +4.03%
Humana
February 2025 enrollment: 5,836,290
December 2024 enrollment: 6,240,001
Percent change: -6.47%
Aetna
February 2025 enrollment: 4,154,602
December 2024 enrollment: 4,407,875
Percent change: -5.75%
Elevance Health
February 2025 enrollment: 2,285,070
December 2024 enrollment: 2,043,406
Percent change: +11.83%
Centene
February 2025 enrollment: 1,045,595
December 2024 enrollment: 1,114,817
Percent change: -6.21%
Cigna
February 2025 enrollment: 697,398
December 2024 enrollment: 587,901
Percent change: 18.63%
