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Provider Networks: HMO, PPO, EPO and POS

A network is the set of providers a plan has contracted with. Whether a doctor is in it often matters more to your costs than the plan's premium.

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Provider Networks: HMO, PPO, EPO and POS at a glance

In-network
Providers who contract with the plan. You generally pay less.
Out-of-network
Providers who do not. Some plans do not cover them at all, except in an emergency.
Plan types differ
HMO, PPO, EPO and POS describe how a plan treats the network.
Check the provider, not the type
Directories are not always accurate; confirm with the plan.

What is provider networks: HMO, PPO, EPO and POS?

A plan's network is the facilities, providers and suppliers it has contracted with to provide health care services. In-network providers have agreed to the plan's allowed amounts, which is why care from them generally costs you less. Out-of-network care may cost more, may not count toward your out-of-pocket maximum, and under some plan types is not covered at all except in an emergency.

The plan type — HMO, PPO, EPO or POS — tells you how a plan treats its network. It does not tell you who is in it. Two plans of the same type can have very different networks, so the useful check is whether your own providers are in a specific plan's current network.

The four common plan types, by structure

Described here as HealthCare.gov defines them. The details of any one plan are in its own documents.

  • HMO — Health Maintenance OrganizationUsually limits coverage to care from doctors who work for or contract with the HMO, and generally does not cover out-of-network care except in an emergency.
  • PPO — Preferred Provider OrganizationYou pay less for providers in the plan's network, and can use providers outside it at a higher cost.
  • EPO — Exclusive Provider OrganizationServices are covered only from doctors, specialists or hospitals in the network, except in an emergency.
  • POS — Point of ServiceYou pay less using network providers, and generally need a referral from your primary care doctor to see a specialist.

Protection from surprise bills

Since January 1, 2022, the No Surprises Act has protected consumers in three situations CMS names: emergency care, non-emergency care from out-of-network providers at in-network facilities, and air ambulance services from out-of-network providers. In those situations your cost-sharing is generally limited to what you would pay in-network.

These protections are specific. Choosing to see an out-of-network doctor for planned care outside those situations can still cost more, which is why checking the network before an appointment matters.

Checking a provider before you rely on the plan

HealthCare.gov suggests checking a plan's provider directory. CMS adds that directories are not always accurate, and suggests calling the insurance company if a provider does not appear.

  • Check each provider you want to keep against the specific plan, not the plan type.
  • Confirm with the provider's office that they participate in that exact plan.
  • If your doctor later leaves the network while you are in an ongoing course of treatment, CMS describes protections that can keep in-network cost-sharing for a limited period.

Common misconceptions

Each of these is repeated often enough to be worth answering directly.

  • Often heard

    A PPO means every doctor is covered the same.

    In practice: A PPO covers out-of-network care, but generally at a higher cost to you than in-network care.

Common questions

Does out-of-network care count toward my out-of-pocket maximum?
Out-of-network care is one of the things HealthCare.gov lists as not counting toward the out-of-pocket maximum, apart from the situations the No Surprises Act protects.

Sources

  1. 1.Network (glossary) — Centers for Medicare & Medicaid Services (accessed Sep 2026)
  2. 2.Health Maintenance Organization (HMO) (glossary) — Centers for Medicare & Medicaid Services (accessed Sep 2026)
  3. 3.Preferred Provider Organization (PPO) (glossary) — Centers for Medicare & Medicaid Services (accessed Sep 2026)
  4. 4.Exclusive Provider Organization (EPO) plan (glossary) — Centers for Medicare & Medicaid Services (accessed Sep 2026)
  5. 5.Point of Service (POS) plan (glossary) — Centers for Medicare & Medicaid Services (accessed Sep 2026)
  6. 6.Ending surprise medical bills — Centers for Medicare & Medicaid Services (accessed Sep 2026)
  7. 7.Getting medical care with your Marketplace plan — Centers for Medicare & Medicaid Services (accessed Sep 2026)
  8. 8.My insurance says my provider is in-network, but they say they aren't — Centers for Medicare & Medicaid Services (accessed Sep 2026)
  9. 9.My doctor is leaving my health plan's network — Centers for Medicare & Medicaid Services (accessed Sep 2026)
  10. 10.Out-of-pocket maximum / limit (glossary) — Centers for Medicare & Medicaid Services (accessed Sep 2026)

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