What Triggered the Rally
Health insurance stocks soared after hours on Monday. The catalyst was a major federal policy announcement. The Centers for Medicare and Medicaid Services (CMS) confirmed a 2.48% net average rate increase for Medicare Advantage plans in 2027. This decision marks a meaningful jump above what CMS initially proposed back in January.
Moreover, the agency projects the new rates will channel over $13 billion in additional Medicare Advantage payments to health plans next year. That figure alone explains why markets reacted so sharply. Investors quickly priced in stronger revenue outlooks for the sector’s biggest players.
Which Stocks Gained the Most
Humana Leads the Pack
Humana (NYSE: HUM) surged approximately 11% in after-hours trading — the sharpest single-session move among its peers. The company is one of the largest Medicare Advantage providers in the United States. As a result, favorable rate updates tend to affect Humana’s bottom line more directly than most rivals.
UnitedHealth and CVS Follow Strong
UnitedHealth (NYSE: UNH) and CVS Health (NYSE: CVS) each climbed around 8%. Both companies operate large Medicare Advantage businesses. Consequently, higher payment rates translate into improved margins without any additional cost burden.
Elevance Health and Hospital Stocks Also Rise
Elevance Health (NYSE: ELV) added approximately 5%. Meanwhile, hospital-linked managed care names also caught a bid. Molina Healthcare (NYSE: MOH) advanced nearly 7%, and Centene (NYSE: CNC) rose about 4%. Together, these moves confirm that the rate announcement lifted the entire sector rather than just the top names.
The 2027 Medicare Advantage Rate Details
How CMS Calculates the Net Rate
The 2.48% net average increase is not a single flat adjustment. Instead, CMS builds it from several components. These include the projected growth rate of underlying medical costs, the 2026 Star Ratings used to determine 2027 quality bonus payments, and updates to risk adjustment methodology.
This layered calculation matters to investors. Each component affects different parts of an insurer’s revenue model. Additionally, the final rates govern how more than half a trillion dollars flow annually through private health plans sold by major insurers. That scale makes even small percentage shifts financially significant.
Dr. Oz Addresses Coverage Affordability
CMS Administrator Dr. Mehmet Oz commented on the announcement, noting that Medicare Advantage and Part D should deliver real value to beneficiaries. He emphasized that the updates are designed to keep coverage affordable. Furthermore, they aim to ensure patients receive meaningful benefits from their plans.
What CMS Changed in Risk Adjustment
Continuing the 2024 Risk Model
CMS confirmed it will keep using the 2024 Medicare Advantage risk adjustment model for 2027 payments. The agency reviewed its impact over the 2024–2026 period before deciding to extend it. This consistency gives insurers greater predictability in their financial planning.
Excluding Unlinked Chart Reviews
Starting in 2027, CMS will remove diagnosis codes from unlinked chart review records when calculating risk scores. This is an important technical shift. Certain insurers rely heavily on these records to support higher-risk patient profiles, and thus higher reimbursement. CMS expects the payment impact to fall disproportionately on organizations that lean on unlinked chart reviews more than others. An exception applies for beneficiaries who switch between Medicare Advantage organizations during the year.
Part D Updates and Market Impact
CMS also finalized revisions to the Part D prescription drug risk adjustment model. These updates reflect cost changes tied to the Inflation Reduction Act and incorporate more current drug expenditure data. For insurers with large pharmacy benefit books, this update adds another layer of financial clarity heading into 2027.
Taken together, the finalized 2027 Medicare Advantage and Part D rate policies give health insurers a stronger and more predictable revenue base. That certainty is precisely what drove Monday’s broad sector rally — and it sets a positive tone for earnings expectations across the managed care landscape.
