Quick Answer: HMO, PPO, EPO, and POS are the four main health insurance network types that determine whether you need a primary care doctor, whether referrals are required, and whether out-of-network care is covered. HMOs have the lowest premiums and strictest network limits. PPOs offer any-doctor flexibility at the highest premium. EPOs skip referrals but cut out-of-network coverage. POS plans require a referral like an HMO but allow out-of-network access like a PPO. Use the <a href="/screener">coverage screener</a> to compare which types are available by your income and zip code.
When you shop for health insurance on the ACA marketplace, your employer's benefits portal, or Medicare Advantage, you will see these four abbreviations. They look similar but each one has a different rule for who you can see, when you need a referral, and what happens if you go outside the network. Picking the wrong type can mean surprise bills or paying for flexibility you never use.
Four Plan Types, Side by Side
The table below shows the five dimensions that separate the four network types. After the table, the key decision rule: if your doctors are in-network and you want the lowest premium, pick HMO. If you see multiple out-of-network specialists or travel frequently, pick PPO. If you want no referral hassle but stay in-network, pick EPO. If you want a PCP to coordinate your care but need occasional out-of-network access, pick POS. Check your <a href="/aca-income-limits">ACA income limits</a> to see if you qualify for cost-sharing reduction Silver plans, which often appear as HMO-type plans and carry significantly lower deductibles. The <a href="/federal-poverty-level">federal poverty level</a> chart shows the thresholds for 2026. Understanding in-network vs out-of-network coinsurance rates helps you see why HMO-style plans save money when every doctor is in the network. For a deeper two-way comparison, see HMO vs PPO.
HMO vs. PPO vs. EPO vs. POS: Key differences (2026)| Feature | HMO | PPO | EPO | POS |
|---|
| PCP required | Yes | No | Sometimes | Yes |
| Referral to specialist | Yes | No | No | Yes (in-network) |
| Out-of-network coverage | Emergency only | Yes, higher cost | Emergency only | Yes, much higher cost |
| Monthly premium | Lowest | Highest | Middle | Middle |
| Network restrictions | Strictest | Loosest | Strict (no OON) | Strict in-network, loose out |
EPO = Exclusive Provider Organization. POS = Point of Service. OON = out-of-network. Costs and rules vary by plan and state. Use the <a href="/screener">screener</a> to compare available plans.
Source: HealthCare.gov: Health insurance plan and network types
Frequently Asked Questions
What is the difference between an EPO and an HMO?
Both EPO and HMO plans limit coverage to in-network providers (emergency care excepted). The key difference is referrals: HMOs require your primary care doctor to refer you to a specialist, while EPOs let you book a specialist directly without a referral. EPOs tend to have slightly higher premiums than HMOs.
What is the difference between a POS plan and an HMO?
A POS plan works like an HMO inside the network: you pick a primary care doctor and need a referral for specialists. The main difference is that a POS plan also lets you go out-of-network, though at a much higher cost. HMOs do not cover out-of-network care except in emergencies.
Which plan type has the lowest premium?
HMOs consistently have the lowest monthly premiums among the four types. They achieve this by restricting care to an in-network group of providers and coordinating everything through your primary care doctor. If keeping premiums low is the top priority and your providers are in-network, HMO is usually the right pick.
Can I see a specialist without a referral on a PPO or EPO?
Yes on both. PPOs and EPOs let you book specialists directly with no referral required. HMOs and POS plans require your primary care physician to refer you first. If you manage a chronic condition with multiple specialists and want direct access, PPO or EPO gives you that.
