UnitedHealthcare and Aetna Narrow Some Medicare Advantage Networks for 2027

UnitedHealthcare and CVS Health’s Aetna are narrowing provider access in parts of their 2027 Medicare Advantage businesses, adding a second decision point for beneficiaries beyond the premium shown on a plan listing. The changes come as insurers respond to higher medical use and tighter federal payments, according to company disclosures reported by Reuters on Thursday, October 1.

For consumers, the practical issue is whether a preferred doctor, hospital or specialist remains in-network for the coming year. A plan’s premium can fall while its network, drug list or cost-sharing rules change.

What the insurers disclosed

UnitedHealthcare said about 66% of its Medicare Advantage members will have access to both an HMO and a PPO in 2027, down from about 70% in 2026. The company is leaving some locations with a high concentration of PPO enrollment, Reuters reported. HMOs generally require members to use a defined network except for emergencies, while PPOs typically allow more out-of-network use at a higher cost.

Aetna is expanding the share of its business offered through HMOs as it reduces its geographic footprint. The insurer expects its Medicare Advantage enrollment to decline by roughly 950,000 and plans to offer coverage in 41 states, down from 43. Humana separately said its 2027 plans would be available in just over 80% of U.S. counties, compared with about 85% in 2026.

Those figures describe broad company footprints, not the choices available to any particular person. Availability and networks vary by county and plan contract.

CMS says the overall market remains stable

The Centers for Medicare & Medicaid Services said on September 29 that Medicare Advantage and Medicare Part D offerings are expected to remain stable in 2027. CMS projected that average Medicare Advantage premiums would decline by more than 16% from 2026 to 2027. That national average does not guarantee that every plan’s premium, benefits or network will improve.

AskNovus previously reported the CMS projection for the average 2027 Medicare Advantage premium. The new insurer disclosures show why premium comparisons are only one part of the annual review.

What to check during open enrollment

Medicare open enrollment runs from October 15 through December 7. CMS advises beneficiaries to compare their current coverage with 2027 options at Medicare Plan Compare. Before changing or renewing a plan, verify:

• whether primary-care doctors, specialists and hospitals are in-network for the exact 2027 plan;
• whether ongoing prescriptions appear on the plan’s 2027 formulary and at what tier;
• the annual maximum out-of-pocket amount, deductibles and copayments;
• referral or prior-authorization requirements; and
• whether a preferred pharmacy remains preferred for 2027.

Provider directories can change. Calling both the plan and the provider’s billing office can reduce the chance of relying on stale information. Members should also read the Annual Notice of Change sent by their current plan.

Why networks are changing

Insurers have cited rising medical utilization and federal payment pressure as reasons to reshape plan footprints and product mixes. These are the companies’ explanations for their decisions; they do not establish that any single factor caused every local network change.

The broader Medicare Advantage market is still large. Roughly 34 million people are expected to be enrolled in 2027, according to the insurer feedback included in the Reuters report, though that would represent a decline from 2026.

This article is general information, not individualized insurance or financial advice. Plan terms differ by location and can change before coverage begins.

Sources

• Reuters: UnitedHealthcare and Aetna outline 2027 Medicare Advantage changes, October 1, 2026
• CMS: 2027 Medicare Advantage and Part D landscape, September 29, 2026
• UnitedHealthcare Medicare Advantage renewal information, accessed October 1, 2026

Featured image: Vitaly Gariev via Unsplash.