The two rules that define each one
HMO — Health Maintenance Organization. You pick a primary care physician who coordinates your care and refers you to specialists. Care outside the network is generally not covered except in an emergency. Networks are usually local.
PPO — Preferred Provider Organization. You can see specialists directly with no referral, and care outside the network is still covered, just at a lower level. Networks are usually much larger, often national.
That is the whole distinction. Every cost difference between them is the price of that flexibility.
Side by side
The third column is the EPO, which sits between the two and is easy to mistake for either.
| PPO | HMO | EPO | |
|---|---|---|---|
| Primary care physician required | No | Usually yes | Usually no |
| Referral to see a specialist | No | Usually yes | Usually no |
| Out-of-network coverage | Yes, at a lower benefit level | Emergencies only | Emergencies only |
| Network size | Large, often national | Local | Regional or local |
| Typical premium | Highest of the three | Lowest | In between |
| Paperwork and pre-approvals | More on your side | Coordinated by your PCP | Moderate |
| Travel and out-of-area care | Strong | Weak | Weak |
General characteristics of each plan type. Your own policy language governs, and benefits, limitations, exclusions and availability vary by state and plan.
Referrals: the day-to-day difference
On an HMO, seeing a dermatologist usually means seeing your primary care doctor first, getting a referral, then booking the specialist. Two appointments, two waits, and sometimes two copays.
On a PPO you book the specialist directly. If you already have specialists you see regularly — a cardiologist, an endocrinologist, an orthopedist — that is the single difference most people notice.
The HMO model is not simply worse. A coordinating primary doctor catches things that fall between specialists, and for someone without an existing set of specialists it can be the more sensible structure as well as the cheaper one.
In network, out of network, and what it costs
In network means the provider has a contract with the plan's network and has agreed to a negotiated rate. That negotiated rate is most of the value of any health plan.
On a PPO, out-of-network care is still covered, but typically with a separate and higher deductible, a lower coinsurance percentage, and the possibility of being billed the difference between what the provider charges and what the plan allows. It is a fallback, not a free pass.
On an HMO or EPO, non-emergency out-of-network care is generally not covered at all. The bill is yours. That is the risk you accept in exchange for the lower premium.
Travel, moves and multi-state households
A national PPO travels. Routine and follow-up care in another state is generally still in network, which matters if you drive for work, spend part of the year elsewhere, or have a child at college out of state.
A local HMO usually does not. Outside its service area, coverage tends to be limited to emergencies, and a routine visit while away can be entirely out of pocket.
If your life is genuinely local — you live, work and receive care within one metro area — you may be paying a PPO premium for reach you never use. Be honest about which of those two you are.
Cost trade-offs worth doing on paper
Compare the whole year, not the monthly figure. Add twelve months of premium to the deductible and the copays you realistically expect, then compare totals.
- A lower HMO premium is real savings if all your care is in network and you rarely travel.
- One out-of-network episode can erase a year of savings on an HMO or EPO, because there is no benefit at all outside the network.
- Referral appointments have a cost too — the copay, the time off work and the delay before the specialist visit.
- Check the drug side separately. Formularies vary independently of the network type, and for someone on a brand-name or specialty medication that can outweigh everything else.
- Look at where your hospital sits. An in-network hospital with out-of-network anesthesiology or radiology is a common and expensive surprise.
Where EPO fits
An EPO — Exclusive Provider Organization — usually drops the referral requirement like a PPO but keeps the HMO's rule that out-of-network care is not covered. You get direct specialist access inside a defined network, at a premium between the two.
It is a reasonable structure if your providers are all inside that network and you do not travel much. Among the plans we place, Bright Life runs on the Cigna PPO for its Copay, Major Medical and HSA plans and the PHCS PPO for its Visit Limit plan, and LifeX runs on the PHCS PPO.
The mistake to avoid is assuming an EPO behaves like a PPO because there are no referrals. It does not, in the one situation that costs the most money.
How to choose in ten minutes
Work through this in order and the answer usually becomes obvious.
- List every doctor and facility you actually used in the last two years.
- Look each one up in the specific network directory of each plan you are considering — by name and by the office address you use.
- Ask whether you travel or spend time in another state, and whether anyone in the household lives away from home.
- Check your prescriptions against each plan's formulary.
- Add up twelve months of premium plus the deductible for each plan and compare the totals, not the monthly premiums.
- If the HMO covers everyone on your list and you are genuinely local, take the savings. If it misses even one specialist you rely on, price the PPO properly.
Where the ACA marketplace fits into this
PPO and HMO are network designs, not a choice between private coverage and the exchange. You can find both shapes in both places, though exchange plans in much of the country have narrowed toward HMO and EPO networks, while many of the private plans we work with run on national PPO networks, depending on the plan and state.
Worth saying plainly before you choose on network alone: if your household qualifies for a large premium tax credit or a cost-sharing reduction on the exchange, that subsidy is very hard to beat, and an exchange plan is likely your better deal even if its network is narrower. Private coverage tends to make more sense for households that receive little or no subsidy. The full comparison is here.