Insurer stocks slide after CMS proposes nearly flat 2027 Medicare Advantage payment update

Health insurer stocks fell sharply on January 27, 2026, after the Centers for Medicare & Medicaid Services (CMS) proposed a net average year-over-year payment increase of just 0.09% for Medicare Advantage in 2027—an outcome that shocked investors who had been bracing for a meaningfully larger increase. The proposal is projected to add a little over $700 million in payments to plans, a stark contrast to the much larger boost insurers received for 2026. ([cms.gov](https://www.cms.gov/newsroom/press-releases/cms-proposes-2027-medicare-advantage-part-d-payment-policies-improve-payment-accuracy-sustainability?utm_source=openai))

The market reaction was immediate across major carriers and diversified health companies with Medicare Advantage exposure. Reports noted steep declines for companies such as UnitedHealth and Humana, with other names also pressured as traders recalibrated expectations for 2027 margins. The sell-off reflected fears that premium pricing and benefit designs may need to tighten if medical costs continue to rise faster than reimbursements. ([ft.com](https://www.ft.com/content/cd12e11b-6bae-4238-8fc8-e93944578f6f?utm_source=openai))

CMS said the annual “Advance Notice” includes routine and technical updates intended to ensure payment accuracy and sustainability, as well as methodological changes that affect risk adjustment and quality bonus payments. In its statement, the agency emphasized that the net increase calculation reflects multiple moving parts—underlying cost trends, star ratings, and risk adjustment changes—rather than a single lever. ([cms.gov](https://www.cms.gov/newsroom/press-releases/cms-proposes-2027-medicare-advantage-part-d-payment-policies-improve-payment-accuracy-sustainability?utm_source=openai))

Insurers and industry advocates pushed back, arguing that nearly flat rates could lead to benefit reductions or higher costs for beneficiaries if plans cannot absorb higher utilization and unit costs. Coverage under Medicare Advantage spans tens of millions of seniors and people with disabilities, making even small rate shifts politically sensitive, especially in an election cycle where affordability is a central theme. ([ft.com](https://www.ft.com/content/cd12e11b-6bae-4238-8fc8-e93944578f6f?utm_source=openai))

Another factor amplifying concern is the regulatory climate around coding practices and payment integrity. Reports noted that CMS’s proposal also intersects with broader scrutiny of diagnostic coding and how plans document patient conditions—an area that can influence payments and has drawn investigative attention in recent years. ([investopedia.com](https://www.investopedia.com/here-is-why-health-insurance-stocks-are-sinking-tuesday-11893199?utm_source=openai))

The proposed rate is not final; CMS can revise the numbers after receiving feedback before finalizing later in 2026. Still, the early signal was enough to move markets, and it sets up a high-stakes negotiation period in which insurers will argue for higher payments while the government frames restraint as necessary for program sustainability and taxpayer protection. ([cms.gov](https://www.cms.gov/newsroom/press-releases/cms-proposes-2027-medicare-advantage-part-d-payment-policies-improve-payment-accuracy-sustainability?utm_source=openai))