Payers ranked by Medicare Part D market share

UnitedHealthcare controls almost one quarter of the Medicare Part D plan market, according to an analysis from KFF. 

The analysis, published July 26, compared market share in 2023 for major payers offering both Medicare Advantage plans and stand-alone Part D plans. 

Most payers analyzed, aside from Kaiser Permanente, offer both standalone plans and Medicare Advantage policies, according to KFF. CVS Health, Centene and Cigna have greater enrollment in standalone Part D plans than Medicare Advantage options, while UnitedHealthcare and Humana have more Medicare Advantage members than standalone plan members. 

Here's how payers stacked up: 

1. UnitedHealthcare: 24 percent market share
2. CVS Health: 17 percent market share
3. Humana: 16 percent market share
4. Centene: 11 percent market share
5. Blue Cross Blue Shield: 7 percent market share
6. Cigna: 6 percent market share
7. Kaiser Permanente: 4 percent market share
8. Elevance Health: 3 percent market share
9. Other carriers: 12 percent market share