Medicare HMO
Review network, primary-care, referral, and emergency-access rules in Medicare HMOs.
Routine care generally stays in network
An HMO is a Medicare Advantage plan whose routine providers and hospitals are generally in its contracted network. Medicare identifies exceptions for emergency care, out-of-area urgent care and temporary out-of-area dialysis. Some HMOs have a point-of-service feature allowing specified out-of-network services, usually at higher cost; check whether the exact contract actually has that feature.
Official source: Medicare: HMO plans ↗ · Medicare: Provider network fact sheet ↗
Primary physician and specialists
Most HMOs ask you to choose a primary care doctor and require a referral for specialist visits, though some services such as a yearly screening mammogram do not need a referral. Prior authorization is a separate plan decision about payment for a treatment. Ask which document or approval is required for your planned provider and service before you schedule nonemergency care.
Official source: Medicare: HMO plans ↗
Out-of-network exposure
If you seek nonemergency care outside the network without coverage or required prior approval, you may owe the full bill. A provider accepting Original Medicare is not automatically in your HMO’s contract. Ask the plan what services are covered outside the network and what you pay; confirm network status with both the plan and provider when making an appointment.
Official source: Medicare: HMO plans ↗ · Medicare: Provider network fact sheet ↗
Prescriptions and costs
Most HMO plans include Part D, but verify the specific plan. Medicare says joining an HMO that lacks drug coverage generally prevents adding a separate Medicare drug plan. HMO members still pay their Part B premium and possibly another plan premium, copays and coinsurance. Compare the exact formularies, pharmacy terms and annual medical maximum rather than a headline premium.
Official source: Medicare: HMO plans ↗ · Medicare: 2026 costs ↗ · Medicare: What drug plans cover ↗
When a doctor leaves
Medicare says Advantage networks may change during a year and plans must protect access to medically necessary care. A plan should notify members who regularly see a departing provider and help them choose a replacement. Check the directory and office again before a significant visit; if a network change threatens ongoing care, use the plan and Medicare service channels to seek a solution.
Official source: Medicare: Provider network fact sheet ↗