How Medicare Advantage Provider Networks Work: HMO vs. PPO Explained

Last Modified: 10/05/2026 | Reviewed by Keith Armbrecht (NPN 634015)

Quick Summary

Many Medicare Advantage plans use provider networks that determine which doctors, specialists, hospitals and other healthcare providers you can use—and what you pay when you use them.

Medicare Advantage HMOs generally require you to receive non-emergency care from providers inside the plan’s network.

Medicare Advantage PPOs generally allow you to receive covered care outside the network, but you will usually pay more.

Understanding the network is critical before enrolling in a Medicare Advantage plan.

Key Facts

  • Medicare Advantage plans may use provider networks.
  • Networks can include doctors, hospitals, specialists and other providers.
  • HMO plans generally require in-network care.
  • PPO plans generally allow out-of-network care at higher cost.
  • Emergency and urgent care receive special protections.
  • Out-of-area dialysis is covered under Medicare rules.
  • HMO plans usually require a primary-care doctor.
  • HMO plans often require referrals to specialists.
  • PPO plans generally don’t require a primary-care doctor.
  • PPO plans generally don’t require referrals.
  • Prior authorization may still apply.
  • Provider networks can change.

What Is a Provider Network?

A network is a group of:

  • Doctors
  • Hospitals
  • Specialists
  • Clinics
  • Laboratories
  • Other healthcare providers

that have contracted with a Medicare Advantage plan.

Using providers inside the network generally gives you the plan’s preferred coverage and cost sharing.

How an HMO Network Works

With a Medicare Advantage HMO, you generally must use providers and facilities inside the plan’s network for non-emergency care.

Exceptions typically include:

  • Emergency care
  • Urgent care
  • Temporary out-of-area dialysis

Some HMO Point-of-Service plans may allow limited out-of-network care at higher cost.

If you receive non-emergency care outside an HMO network without the required authorization, you may have to pay the full cost.

How a PPO Network Works

With a Medicare Advantage PPO, you generally have more flexibility.

You can typically:

Use in-network providers at the lower cost

or

Use out-of-network providers for covered services at a higher cost

The provider must still be willing and eligible to provide the service under Medicare and plan rules.

HMO vs. PPO

HMO

Network restriction: Stronger
Out-of-network: Generally not covered except certain situations
Primary-care doctor: Usually
Specialist referral: Usually
Cost: Often lower in network

PPO

Network restriction: More flexible
Out-of-network: Usually available at higher cost
Primary-care doctor: Generally not required
Specialist referral: Generally not required
Cost: Out-of-network usually higher

What If Your Doctor Leaves the Network?

Medicare Advantage provider networks can change.

Plans have requirements to notify affected members in certain circumstances, but you may need to find another provider within the plan network.

This is why checking your provider network shouldn’t be a one-time exercise.

Video Explanation from Keith

Medicare Advantage Networks: What You Need to Know

Keith's Take

One of the biggest mistakes I see is someone asking:

“Does my doctor take Medicare?”

That’s not enough if you’re joining Medicare Advantage.

The better question is:

“Is my doctor in this specific Medicare Advantage plan’s network?”

And don’t stop with your primary doctor.

Check:

Specialists

Hospital

Cancer center

Cardiologist

Surgeon

and any other provider that would matter if your health changed.

A $0-premium plan isn’t much of a bargain if the doctors or hospitals you want aren’t in the network.

Keith Armbrecht
Keith Armbrecht
Medicare on Video

Frequently Asked Questions About Medicare Advantage Networks

Q. Does every Medicare Advantage plan have a network?
A. Many do, but network rules depend on the plan type.
Q. Can I use any doctor with an HMO?
A. Generally no. HMOs usually require you to stay in network for non-emergency services.
Q. Can I go outside a PPO network?
A. Generally yes, but you'll usually pay more.
Q. Are emergency services covered out of network?
A. Yes, Medicare Advantage plans provide protections for emergency and urgently needed care.
Q. Do HMOs require referrals?
A. Usually.
Q. Do PPOs require referrals?
A. Generally no.
Q. Can my doctor leave the plan network?
A. Yes. Provider networks can change.
Q. How do I know whether a doctor is in network?
A. Check the plan's current provider directory and, ideally, confirm directly with both the plan and provider.
Q. Does being “a Medicare doctor” mean they're in my Medicare Advantage network?
A. No. A provider can participate in Medicare while not participating in a particular Medicare Advantage plan.

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