HMO, PPO, EPO, POS — what the letters decide
These four letters decide whether you can keep your doctor. They matter more than the metal tier and more than the insurer's name.
Four letters on a plan name decide whether you can keep your doctor, whether you need a referral, and what happens if you are treated by someone outside the plan. They matter more than the metal tier and more than the insurer's name.
| Type | Referral needed? | Out-of-network covered? | Typical premium |
|---|---|---|---|
| HMO | Yes, from a primary care doctor | Emergencies only | Lower |
| EPO | Usually no | Emergencies only | Lower to moderate |
| POS | Yes, from a primary care doctor | Yes, at a higher cost | Moderate |
| PPO | No | Yes, at a higher cost | Higher |
The distinction that costs people money
HMO and EPO plans do not cover out-of-network care at all, except in a genuine emergency. Not "cover it at a lower rate" — do not cover it. If you see a doctor outside the network you pay the entire bill, and it does not count toward your deductible or your out-of-pocket maximum.
This is the mechanism behind most surprise medical bills on marketplace plans. The out-of-pocket maximum that caps your annual exposure applies to in-network care only. Out-of-network, on an HMO or EPO, there is no cap.
PPO and POS plans do cover out-of-network care, at a worse rate and usually against a separate, higher deductible. That flexibility is most of what the higher premium buys.
Narrow networks are the norm now
Marketplace plans commonly use narrower networks than employer plans do, because a smaller network is how an insurer holds the premium down. That is a legitimate trade and it is only a bad deal if the doctors you need are outside it.
Networks also change between plan years. An insurer can drop a hospital system in January, and the plan you renewed automatically is not the plan you had.
How to check properly
- Search the insurer's directory for the specific plan, not the insurer generally. One company's PPO and HMO in the same county have different networks.
- Then call the doctor's office and ask whether they accept that exact plan, by name, for the coming year. Directories are frequently out of date; the office knows.
- Check the hospital as well as the doctor. A surgeon can be in network at a hospital that is not, and you will be billed by both.
- Check anesthesia, pathology and radiology if you have a planned procedure. These are the specialties most often out of network at an in-network hospital.
What the No Surprises Act does cover
Federal law protects you from surprise balance bills in three situations: emergency care at an out-of-network facility, care from an out-of-network provider at an in-network hospital, and out-of-network air ambulance transport. In those cases you pay only your normal in-network cost sharing.
It does not protect you when you knowingly choose an out-of-network provider for non-emergency care, and it does not turn an HMO into a PPO. Ground ambulances are largely still not covered by it.
Which type suits which situation
- You have doctors you will not change: check whether they are in an HMO's network. If they are, the lower premium is free money. If they are not, a PPO may be worth the difference.
- You travel or split time between states: a PPO, or at minimum check what the plan does outside its service area.
- You are generally healthy and flexible about providers: an HMO or EPO is usually the better value.
- You see specialists regularly: weigh the referral requirement. An HMO referral is an extra appointment before each specialist visit.