Every marketplace plan carries a set of letters after its name, and those letters decide whether you can see the specialist your friend recommended, whether you need a referral from your primary care doctor first, and what happens to your wallet if you get care outside the plan’s network. Shoppers tend to fixate on the premium and the metal tier and treat the HMO, PPO, EPO or POS label as fine print. It is not. It is the part of the plan you will bump into most often once you are enrolled.
This guide explains what each of the four plan types does, how they differ on cost, referrals and out-of-network coverage, which insurers sell which kind, and how the plan type interacts with your premium tax credit. It also flags what is changing for 2027, since several carriers are leaving the market. If you are still deciding which insurer to shop, our ranking of the best health insurance companies of 2026 is the place to start.
The four plan types at a glance
All four cover the same essential health benefits and are subject to the same annual out-of-pocket maximum for in-network care. What differs is the network: which doctors and hospitals the plan has contracted with, and what the plan does when you go elsewhere. The definitions below follow HealthCare.gov’s plan types page.
| Plan type | Primary care doctor required? | Referral to see a specialist? | Out-of-network coverage? | Typical premium |
|---|---|---|---|---|
| HMO (Health Maintenance Organization) | Usually yes | Usually yes | No, except emergencies | Lowest |
| EPO (Exclusive Provider Organization) | Usually no | Usually no | No, except emergencies | Low to moderate |
| POS (Point of Service) | Yes | Yes | Yes, at higher cost | Moderate |
| PPO (Preferred Provider Organization) | No | No | Yes, at higher cost | Highest |
Think of it as two dials: how much gatekeeping you accept, and whether the plan pays anything outside its network. HMOs turn both toward restriction and reward you with the lowest premium. PPOs turn both toward freedom and charge for it. EPOs and POS plans each loosen one dial and keep the other tight.
HMO: lowest cost, tightest rules
An HMO limits coverage to doctors who work for or contract with the plan. You generally pick a primary care physician, and that doctor has to refer you before the plan will cover a specialist visit. Go outside the network for anything other than an emergency and you pay the full bill. In exchange, HMOs usually have the lowest premiums, and many focus on prevention and coordinated care.
HMOs dominate the individual market. Kaiser Permanente is the purest example: it owns its hospitals and employs its physicians, so your doctor, lab, pharmacy and specialist all sit inside one system in its eight states plus Washington DC. That integration is a big reason Kaiser holds more NCQA top ratings than any other organization and was rated highest in J.D. Power’s 2026 member study in California for the 19th straight year. The trade-off is that you must use Kaiser facilities, a poor fit for anyone who travels a lot or splits time between states.
Budget carriers lean on HMOs too. Molina sells HMOs built on narrow, managed networks, and Ambetter’s Value plans are HMOs that require a primary care doctor and referrals. Even carriers that used to sell looser designs are tightening up: according to broker reports, Oscar moved from EPO to HMO plans in Florida and many other states for 2026, and UnitedHealthcare’s 2026 Maryland plans now require referrals. Verify the plan type in your own county rather than assuming a carrier’s reputation still holds.
Who an HMO suits
- People whose doctors and preferred hospital already belong to one health system.
- Shoppers who care most about the monthly premium and predictable copays.
- People coming off Medicaid, who are used to managed networks and often find the same carriers on the marketplace.
PPO: the most freedom, at a price
A PPO pays less when you use in-network providers but still covers you, at a higher cost, when you go out of network. You do not need a primary care doctor or referrals to see specialists. That flexibility is why PPOs are the most expensive design on the individual market.
They are also increasingly hard to find. Outside the Blue Cross Blue Shield system, PPOs are rare on the ACA marketplace, and even some Blues have narrowed their on-exchange networks. Ambetter’s Premier plans are sold as PPO or EPO depending on the state, and Ambetter from Health Net offers HMO and PPO plans in 10 California counties for 2026. If a PPO matters to you, filter for it early, because in many counties you may find only one or none.
One caution before you pay extra for one: “out-of-network coverage” does not mean generous coverage. Out-of-network care typically comes with its own higher deductible and coinsurance, and the federal out-of-pocket maximum ($10,600 for an individual in 2026, $12,000 in 2027) applies to in-network care, so check the plan’s Summary of Benefits and Coverage to see what, if anything, limits your out-of-network spending.
Who a PPO suits
- People with established doctors across several health systems.
- Anyone managing a complex condition who wants direct access to specialists.
- Households that split time between two states or travel often, so long as the network actually extends to those places.
EPO: the middle ground
An EPO keeps the HMO’s rule that only in-network care is covered (again, except emergencies) but drops the gatekeeping: you usually do not need a primary care doctor or a referral to see an in-network specialist. Premiums tend to land between HMO and PPO levels.
For years the EPO was the signature design of Oscar, which paired it with $0 virtual care and app-based navigation. As noted above, Oscar has shifted many of its 2026 plans to HMO, so double-check the label on any Oscar plan. Ambetter’s Premier plans and some Blue Cross Blue Shield and UnitedHealthcare marketplace plans are EPOs in certain states, though carriers do not always spell out the network type prominently, so read the plan documents.
The EPO’s main risk is the one people forget: with no gatekeeper, it is easy to book a specialist yourself and discover afterward that the practice was out of network, and on an EPO that is a bill you own. The provider directory check in our guide on how to choose a health insurance plan matters more here than on any other plan type.
POS: a hybrid you will see less often
A POS plan is essentially an HMO with an escape hatch. You pay less in network and need a primary care doctor and referrals for specialists, but the plan covers some out-of-network care at a higher cost. The Blue Cross Blue Shield system sells POS plans in some regions; elsewhere they are uncommon on the individual market.
A POS plan can make sense if you value the coordination of an HMO but want the option to see one specific out-of-network doctor. Read the referral rules carefully, because the out-of-network benefit may still require a referral from your primary care doctor.
What every plan type handles the same way
Because all four are ACA plans, several protections apply regardless of the letters on the card:
- Emergencies. Emergency care is covered on every plan type, and under federal surprise-billing protections it is generally treated at in-network cost-sharing even at an out-of-network hospital; the details are on CMS’s No Surprises page.
- Essential health benefits. Every plan type covers the same essential health benefits, including pediatric dental and vision.
- Out-of-pocket maximum. The 2026 federal ceiling for in-network care is $10,600 for an individual and $21,200 for a family, rising to $12,000 and $24,000 in 2027.
- Metal tiers. Bronze, Silver, Gold and Platinum describe how costs are split, not the network. You can buy a Bronze HMO or a Gold PPO. Our guide to metal tiers covers that side of the decision.
How plan type interacts with your subsidy
Here is a detail that catches people. The premium tax credit is calculated against the second-lowest-cost Silver plan in your county, the “benchmark,” which is usually a narrow-network HMO or EPO. Your credit is a fixed dollar amount you can apply to any plan, so if you choose a PPO that costs more than the benchmark, you pay every dollar of the difference yourself.
Take a family of four expecting $120,000 of income in 2027. The 2026 poverty guideline for four is $33,000, so that household sits at about 364% of the federal poverty level, inside the 300% to 400% band where IRS Revenue Procedure 2025-25 sets the expected contribution at 9.96% of income. That is $11,952 a year, or $996 a month, toward the benchmark Silver plan. If the benchmark is a $1,900-a-month HMO (an illustrative figure; your county will differ), the family’s credit is about $904 a month. Pick a $2,300 PPO instead and the credit stays $904, so the family pays $1,396 a month rather than $996, or $4,800 more over the year for network flexibility. Sometimes that is exactly the right purchase; the point is to see the number first. And note the cliff: above $132,000 of income the credit vanishes entirely, on any plan type.
That math got harsher in 2026. Enhanced credits expired at the end of 2025 and, as of this writing, Congress has not restored them; benchmark premiums rose about 26%, and KFF reports the average net premium paid by enrollees jumped from $113 to $178 a month. For families weighing one broad plan against several narrow ones, see our guide to health insurance for families.
Which plan type is right for you?
Use these questions as a quick sort, then let the HealthCare.gov comparison tool filter plans by your doctors, prescriptions and plan type.
- Are all your doctors in one health system? Choose an HMO and pocket the savings. If that system is Kaiser, it is hard to beat on quality scores.
- Do you see specialists regularly and dislike waiting on referrals? Look for an EPO first; move to a PPO only if the EPO networks in your county exclude a doctor you cannot give up.
- Do you have doctors in two or more unaffiliated systems, or live part of the year elsewhere? Shop for a PPO, most likely from a Blue Cross Blue Shield plan, and confirm the network covers both places.
- Do you want coordinated care but need one out-of-network specialist? A POS plan, where available, threads that needle.
- Are you on a tight budget and generally healthy? A Bronze HMO from Ambetter, Molina or Oscar is often the lowest-premium option in a county, and every Bronze plan is HSA-eligible from 2026.
Whatever you pick, remember that a KFF survey found 58% of insured adults had a problem with their coverage in the past year. Discovering a provider is out of network after the visit is the most preventable version, and on an HMO or EPO it is expensive. Confirm every doctor by calling the office and naming the exact plan.
What is changing for 2027
If you are shopping during the November 1, 2026 to January 15, 2027 open enrollment, three shifts affect this decision:
- Carriers are leaving. Cigna exits the individual market in all 11 of its states after December 31, 2026, Molina is cutting from 14 states to 6, and Ambetter is leaving Delaware and New Hampshire. If your plan disappears, the replacement you are mapped to may have a different network, so do not auto-renew blindly.
- Networks are tightening. Oscar’s move toward HMO designs and UnitedHealthcare’s new referral rules in Maryland are examples of a wider drift toward gatekeeping as insurers try to control costs.
- A new category is coming. Under the 2027 federal payment rule, “non-network” plans that pay fixed dollar amounts and have no provider network at all may be sold on the federal exchange starting in 2028. They will need careful reading when they arrive.
Bottom line
The plan type is the part of your coverage you will feel most often, so choose it deliberately. HMOs cost least and work well when your care lives inside one system. EPOs add specialist freedom without adding out-of-network coverage. PPOs and POS plans are the only designs that pay anything outside the network, and on the individual market they are increasingly a Blue Cross Blue Shield specialty at a higher premium. Because your subsidy is pegged to a benchmark Silver plan that is usually a narrow HMO or EPO, any upgrade in flexibility comes straight out of your pocket, so run the numbers before you pay for freedom you may not use.
To see which carriers offer which plan types in your state, and how they rate on service and quality, see our ranking of the best health insurance companies of 2026.