The two largest names in Medicare Advantage are steering 2027 members toward plans with tighter doctor networks. UnitedHealthcare will exit some areas where it offers a higher share of preferred provider organization (PPO) plans, and Aetna is expanding health maintenance organization (HMO) plans, Reuters reported on October 1.
For a retiree, that shift can quietly change who the family calls when a parent needs a cardiologist. A PPO lets members see out-of-network providers at a higher cost. An HMO generally does not, except for emergencies and a few other situations.
The change matters now because open enrollment runs from October 15 through December 7, and new choices take effect January 1. Members who let a plan roll over without checking could start 2027 in a network that no longer includes their doctors.
Narrower Networks Change the Family Care Plan
A UnitedHealthcare spokesperson told Reuters that 66% of its members will have access to both HMO and PPO options in 2027, down from 70% in 2026. "We can't ignore the realities facing the healthcare system," UnitedHealthcare President Bobby Hunter said, citing funding pressures, rising medical and drug costs, and increased use of care.
The company's 2027 plan announcement focuses on access instead. It says about 95% of Medicare-eligible people in its footprint will have access to a UnitedHealthcare Medicare Advantage HMO plan, and about 90% of eligible consumers with access will have a $0 premium option.
For households, the practical question is referrals. According to Medicare.gov's HMO guide, "In most cases, you have to get a referral to use a specialist in HMO Plans." That adds a step for an older adult with several specialists and for the adult child coordinating that care.
HMO members generally must use network doctors and hospitals, with exceptions for emergency care, out-of-area urgent care, and temporary out-of-area dialysis. People who split the year between two states should confirm how a plan handles routine care away from home.
Insurer by Insurer: Confirmed Changes and Open Questions
Aetna will offer Medicare Advantage plans in 41 states in 2027, down from 43 this year, according to Reuters. TD Cowen analyst Ryan Langston estimated that the company will shed about 950,000 enrollees as it leaves some states. That figure is an analyst estimate, not an Aetna count.
Humana has not announced a move toward narrower networks. Its 2027 Medicare Advantage release says it will offer plans in about 2,600 counties across 45 states and Washington, D.C., covering more than 80% of U.S. counties, and will add $0 in-network routine lab services. For 2026, Humana said its plans covered 85% of U.S. counties in 46 states and Washington, D.C.
Benefits are also tightening across the market. STAT reported that insurers are raising out-of-pocket costs, cutting money for dental work and other extras, and "eliminating plans that have broad networks of hospitals and doctors."
The Centers for Medicare & Medicaid Services projected on September 28 that about 34 million people will be enrolled in Medicare Advantage in 2027 and that the average monthly premium will fall to about $12 from $14.37. A low premium, however, does not tell a family whether its doctors are covered.
MedicalDaily reported in September that members facing 2027 plan exits should check doctor networks before open enrollment. Since then, the insurers have confirmed their 2027 lineups, and the shift toward HMOs is now on the record.
Checking Networks Before the December 7 Deadline
Start with the Annual Notice of Change. Plans send it in September, and Medicare advises members to "review any changes to decide whether the plan will continue to meet your needs in the next year." Anyone who did not receive one should contact the plan.
Next, list every doctor, hospital, pharmacy, and prescription the family relies on. Enter them in the Medicare plan finder, then call each office to confirm it will accept that specific plan next year. Provider directories can lag behind contract changes.
Medicare's provider network fact sheet says plans should make "a good faith effort" to give members at least 30 days' notice when a provider leaves the network. That is a short window for someone in the middle of cancer care or rehabilitation.
People in active treatment, those who see several specialists, and members who travel often may notice a move from a PPO to an HMO the most.
Costs, Referrals, and Free Help for Caregivers
Comparing plans means weighing premiums, copays, the out-of-pocket maximum, and drug coverage together. An HMO may cost less each month but limit where care is covered.
Free, unbiased counseling is available through each state's State Health Insurance Assistance Program (SHIP), and 1-800-MEDICARE (1-800-633-4227) can answer coverage questions 24 hours a day, seven days a week. Members should not stop or change medications because of a plan switch without talking with their clinician.
Most members still have choices, but the market is moving toward narrower networks. A careful check now can help families avoid a surprise bill in January.
Key Questions Answered
What changed for 2027 Medicare Advantage networks?
UnitedHealthcare will exit some areas where it offers more PPO plans, and Aetna is expanding HMO plans, according to Reuters. Both moves point to narrower networks for some members.
Is Humana narrowing its networks?
Humana has not announced narrower networks. It says it will offer plans in about 2,600 counties, or more than 80% of U.S. counties, compared with 85% in 2026.
What is the main difference between an HMO and a PPO?
HMOs generally cover only network providers, except for emergency care, out-of-area urgent care, and temporary out-of-area dialysis, and they usually require referrals to see specialists. PPOs also cover out-of-network care, at a higher cost.
When can I change plans?
Open enrollment runs from October 15 through December 7. New coverage takes effect January 1.
How do I confirm my doctor is in-network?
Use the Medicare plan finder, then call the doctor's office and ask whether it will accept that exact plan in 2027.
Where can families get free help?
State Health Insurance Assistance Programs offer free counseling, and 1-800-MEDICARE answers general coverage questions.
Published by Medicaldaily.com
