Choosing a health insurance plan can feel like deciphering an alphabet soup. EPO, PPO, HMO, POS, HDHP, each acronym describes a fundamentally different way of accessing and paying for care. Understanding what each plan type actually does, and where it falls short, makes the decision far less overwhelming.
This guide covers every major plan type available in the US market, from the most common (HMO, PPO, EPO, POS) to the more specialized options (HDHP with HSA, catastrophic plans, indemnity plans, and short-term coverage). The goal is to help readers understand which plan structure fits their health situation, budget, and provider preferences. If specific plan options are still unclear, a licensed health insurance navigator or broker can help compare options side by side.
Quick-Reference Comparison: All Major Plan Types
Before diving into the details, here is a side-by-side snapshot of the six most common plan structures. According to HealthCare.gov, these plan types differ primarily in how they structure provider networks, referral requirements, and cost-sharing.
| Plan Type | Network Restriction | Referral Required | Out-of-Network Coverage | Typical Premium Level |
|---|---|---|---|---|
| HMO | In-network only | Yes (PCP required) | Emergency only | Lowest |
| EPO | In-network only | No (most plans) | Emergency only | Low to mid |
| PPO | Preferred network | No | Yes (higher cost) | Highest |
| POS | In-network preferred | Yes (PCP required) | Yes (higher cost) | Mid |
| HDHP | Varies | Varies | Varies | Low (high deductible) |
| Catastrophic | Limited | Varies | Emergency only | Very low |
"Understanding your health plan options is essential when choosing a plan for you and your family." -- HealthCare.gov
EPO (Exclusive Provider Organization) Plans
What does EPO mean in health insurance? An EPO, or Exclusive Provider Organization, is a managed care plan that covers services only when members use providers within the plan's designated network, with the exception of genuine medical emergencies.
According to HealthCare.gov's glossary, an EPO is "a managed care plan where services are covered only if you go to doctors, specialists, or hospitals in the plan's network (except in an emergency)."
What is an EPO health insurance plan in practice?
An EPO borrows features from both HMO and PPO structures. Like an HMO, it restricts coverage to a defined network of providers. Like a PPO, most EPO plans do not require members to choose a primary care physician (PCP) or obtain a referral before seeing a specialist. This combination makes EPOs a practical middle-ground option for people who want specialist access without the administrative friction of referrals, while still accepting tighter network boundaries in exchange for lower premiums.
Gated vs. non-gated EPO plans
Some EPO plans are "gated," meaning a PCP must coordinate care and provide referrals to specialists. Non-gated EPO plans allow members to book specialist appointments directly within the network. Plan documents or the insurer's member portal will specify which structure applies.
Prior authorization
EPO plans may require prior authorization, meaning advance approval from the insurance company, before covering certain procedures, imaging studies, or specialist treatments. Members should verify prior authorization requirements before scheduling non-routine care.
Key advantages of an EPO:
- No requirement to select a primary care physician (on non-gated plans)
- Direct specialist access without referrals (on non-gated plans)
- Lower monthly premiums than comparable PPO plans
- Streamlined network structure that reduces administrative complexity
Key limitations of an EPO:
- No coverage for out-of-network providers outside of emergencies
- When a provider leaves the insurer's network, ongoing care may be disrupted
- Out-of-state non-emergency care is generally not covered
- Some plans are gated and do require referrals; plan documents must be checked
An AI healthcare navigator can help members verify whether their current providers are in-network before enrolling in an EPO plan.
PPO (Preferred Provider Organization) Plans
What is a health insurance PPO? A PPO, or Preferred Provider Organization, is a health insurance plan that offers a network of preferred providers at lower cost-sharing rates while still providing partial coverage for out-of-network care at higher cost.
According to the KFF 2024 Employer Health Benefits Survey, 47% of covered workers with employer-sponsored insurance are enrolled in PPO plans, making it the most common plan type in the employer market.
How a PPO works
Members can see any licensed provider without a referral. Visiting in-network providers costs less (lower copays, lower coinsurance). Visiting out-of-network providers is still covered, but members pay a larger share of the bill. PPOs do not require members to choose a primary care physician.
Key advantages of a PPO:
- Maximum provider flexibility, including out-of-network access
- No referrals required for any provider, in or out of network
- Broadly useful for people who see specialists frequently
- Favorable for members who split time between geographic regions or travel often
Key limitations of a PPO:
- Highest monthly premiums of the common plan types
- Out-of-network care carries higher out-of-pocket costs than in-network care
- More complex cost structure (in-network vs. out-of-network deductibles, coinsurance tiers)
NerdWallet's HMO vs. PPO comparison notes that PPO plans are well suited for individuals who have established relationships with specific providers or specialists who are not in a narrower network.
HMO (Health Maintenance Organization) Plans
What is an HMO in health insurance? An HMO, or Health Maintenance Organization, is a plan that restricts coverage to a defined local network of providers and requires members to coordinate care through a designated primary care physician.
HMOs are generally the lowest-cost plan type available, with lower monthly premiums and predictable copays. The tradeoff is less provider flexibility compared to other common plan structures.
What does PCP mean in health insurance, in the context of an HMO?
A PCP, or primary care physician, acts as the care coordinator in an HMO. The PCP handles routine care and issues referrals to in-network specialists when needed. Members cannot typically access specialist care without that referral in an HMO structure. This coordination model is designed to reduce redundant testing and improve continuity of care.
Key advantages of an HMO:
- Lowest monthly premiums of any standard plan type
- Predictable, consistent copays for most services
- Coordinated care through a single PCP reduces gaps in treatment
- Often low or no deductible before coverage begins
Key limitations of an HMO:
- Referrals required for all specialist visits
- No coverage for out-of-network providers except in emergencies
- Network size is typically smaller and more geographically limited than PPOs
- Changing PCPs requires administrative steps
HMOs work well for individuals with predictable, routine health needs who prioritize lower costs over provider choice. Those managing complex or multi-specialty conditions may find the referral process adds friction to care access.
POS (Point of Service) Plans
What is POS health insurance? A POS, or Point of Service plan, is a hybrid plan that combines elements of HMO and PPO structures. Members choose a PCP who coordinates in-network care and manages referrals, but members retain the option to go out-of-network at higher personal cost.
What does POS mean in health insurance in practical terms?
The name reflects the decision made at the "point of service." Each time care is needed, the member chooses whether to stay in-network (lower cost, coordinated through the PCP) or go out-of-network (higher cost, without referral coordination). Unlike a PPO, in-network POS care does typically require a referral from the PCP to see a specialist.
What is a POS health insurance plan best suited for?
POS plans are a reasonable middle ground for people who want the option of out-of-network access but prefer the cost structure of a coordinated-care plan. They tend to have higher premiums than HMOs but lower premiums than PPOs.
Key advantages of a POS:
- Out-of-network access is available when needed
- Lower premiums than a comparable PPO
- Coordinated care through a PCP for in-network services
Key limitations of a POS:
- Referrals are required for in-network specialist visits
- Out-of-network care is reimbursed at a lower rate and involves more paperwork
- More administrative complexity than an EPO or PPO
HDHP + HSA: High-Deductible Plans and the Tax Advantage
What is HDHP health insurance? An HDHP, or High-Deductible Health Plan, is a health insurance plan with a higher annual deductible than traditional plans and lower monthly premiums. HDHPs are typically paired with a Health Savings Account (HSA) that provides tax advantages for out-of-pocket healthcare spending.
According to IRS Revenue Procedure 2024-25, for 2025 a plan qualifies as an HDHP if the deductible is at least $1,650 for individual coverage or $3,300 for family coverage.
How the HSA works
An HSA is a tax-advantaged savings account available only to individuals enrolled in a qualifying HDHP. Contributions are tax-deductible, growth within the account is tax-free, and withdrawals used for qualified medical expenses are also tax-free. Unused funds roll over year to year. For 2025, HSA contribution limits are $4,300 for individual coverage and $8,550 for family coverage, per IRS Revenue Procedure 2024-25.
The tax math in plain terms
A person in the 22% federal tax bracket who contributes the full individual HSA limit of $4,300 saves approximately $946 in federal income tax that year. This figure reflects federal income tax only; state income tax and payroll tax savings, where applicable, would increase the total. Combined with lower monthly premiums, an HDHP with HSA can produce meaningful annual savings for people who do not use significant healthcare services in a given year.
Who benefits most from an HDHP:
- Generally healthy individuals with low expected healthcare utilization
- People who want to build a tax-advantaged fund for future medical expenses
- Self-employed individuals who can deduct both the premium and HSA contributions
- Those approaching retirement who want to accumulate HSA funds for healthcare costs in later years
Who may find an HDHP a less suitable fit:
- Individuals with chronic conditions who require frequent care or expensive medications, such as type 1 or type 2 diabetes or hypothyroidism
- Families with young children who tend to use healthcare services regularly
- Anyone whose savings would not comfortably cover the plan's full deductible in a given year
A doctor can advise on whether a high-deductible plan is appropriate given an individual's anticipated care needs.
Catastrophic Health Insurance Plans
What is a catastrophic health insurance plan? A catastrophic plan is a low-premium, high-deductible health insurance policy designed to provide coverage for major medical events. Catastrophic plans cover three primary care visits and recommended preventive services before the deductible is met, but otherwise require members to pay all costs until the annual out-of-pocket maximum is reached.
Who qualifies for a catastrophic plan
According to HealthCare.gov, catastrophic plans are available to people under 30 and to individuals 30 or older who qualify for a hardship or affordability exemption, meaning they would otherwise be unable to afford any other marketplace plan.
Key features of catastrophic plans:
- Very low monthly premiums compared to metal-tier plans
- High annual deductible (equal to the ACA out-of-pocket maximum: $9,200 for individuals in 2025)
- Cover preventive care and three primary care visits per year with no cost-sharing
- Do not qualify for premium tax credits on the ACA marketplace
Catastrophic plans are designed as a safety net for younger, healthier individuals rather than as a cost-saving alternative for people with ongoing medical needs. A doctor or care navigator can help assess whether the coverage level is adequate for an individual's health situation.
Indemnity (Fee-for-Service) Plans
What is indemnity health insurance? An indemnity plan, also called a fee-for-service plan, is a health insurance structure that allows members to receive care from any licensed provider anywhere in the country, after which the insurance company reimburses a portion of the cost.
Indemnity plans are among the oldest health insurance structures in the US. Unlike managed care plans (HMO, EPO, POS), they do not use a provider network. Members pay providers directly and then file claims for reimbursement.
How indemnity plans work
The insurer reimburses a percentage of the "usual, customary, and reasonable" (UCR) rate for a given service in a given geographic area. If a provider charges more than the UCR rate, the member pays the difference. There are no referral requirements and no network restrictions.
Key advantages:
- Complete provider freedom; any licensed provider in any location
- No referrals, no network directories to check
- Useful for people with highly specific provider relationships
Key limitations:
- Typically the most expensive plan type in terms of premiums
- Administrative burden: members must file claims themselves
- Reimbursement is based on UCR rates, which may be lower than actual charges
- Increasingly rare in the US employer-sponsored market
Indemnity plans are most relevant today as supplemental insurance or for specific populations such as some federal employees or retirees with legacy coverage. According to HealthCare.gov, indemnity plans are one of the older plan structures still available in portions of the market, though they represent a small share of current enrollment.
Short-Term Health Insurance
What is short-term health insurance? Short-term health insurance is a limited-duration policy designed to provide temporary coverage during gaps between comprehensive health plans, for example between jobs, before Medicare eligibility, or during a waiting period for employer-sponsored coverage.
Coverage gaps in short-term plans
Short-term plans are not required to comply with the Affordable Care Act's consumer protections. According to the Kaiser Family Foundation, short-term plans commonly exclude coverage for pre-existing conditions, maternity care, mental health services, and prescription drugs. They do not count as minimum essential coverage under the ACA.
Duration and state restrictions
A 2024 federal rule finalized by the Department of Health and Human Services limits new short-term plans to a maximum initial term of three months, with limited renewability. According to KFF, several states including California, New York, and Massachusetts apply additional restrictions or prohibit these plans entirely. State insurance department websites provide current rules for each state.
When short-term coverage makes sense:
- A very brief coverage gap (under 60 days) between two comprehensive plans
- A healthy person between jobs who cannot afford COBRA continuation coverage
- A transitional period before ACA open enrollment
When short-term coverage may not be sufficient:
- Ongoing prescription needs or chronic conditions, such as ischemic heart disease
- Pregnancy or anticipated family planning
- Anticipated surgical procedures or specialist care
Short-term plans are best treated as a temporary measure rather than a long-term coverage strategy. A licensed navigator can identify whether ACA special enrollment or a marketplace plan is a better option in a given situation.
Other Plan Structures Worth Knowing
What is gap health insurance?
Gap insurance, also called supplemental or gap coverage, is a secondary policy that pays for costs remaining after the primary health insurance plan pays its share, such as deductibles, copays, and coinsurance. It is not a standalone health plan. Gap plans are often offered through employers alongside high-deductible primary plans to reduce employee out-of-pocket exposure.
What is ICHRA health insurance?
An ICHRA, or Individual Coverage Health Reimbursement Arrangement, is an employer-funded benefit that allows employers to reimburse employees tax-free for individual health insurance premiums and qualifying medical expenses. Employees purchase their own ACA-compliant plan and submit expenses for reimbursement. ICHRAs give employers a defined contribution model without the administrative burden of a group health plan.
What is self-funded health insurance?
Self-funded (or self-insured) health insurance is a model in which an employer directly bears the cost of employee healthcare claims rather than paying fixed premiums to an insurance carrier. The employer typically contracts with a third-party administrator (TPA) to manage claims processing and may purchase stop-loss insurance to cap exposure for large individual claims. Self-funded plans are common among large employers and are regulated by ERISA rather than state insurance law.
What is comprehensive health insurance?
Comprehensive health insurance refers to plans that meet ACA minimum essential coverage standards and cover the ten essential health benefits defined in the ACA, including preventive care, emergency services, hospitalization, maternity care, mental health services, and prescription drugs. Most major medical plans (HMO, EPO, PPO, POS) sold on or off the ACA marketplace are comprehensive plans by this definition.
What is commercial health insurance?
Commercial health insurance refers to plans offered by private insurers, as distinguished from government programs like Medicare or Medicaid. Employer-sponsored group plans, ACA marketplace plans, and individually purchased plans are all commercial health insurance. The term is a category descriptor, not a plan type.
How to Pick the Right Plan Based on Your Health Usage
No plan type is universally superior. The right structure depends on how often care is used, which providers must remain accessible, what geographic coverage is needed, and what out-of-pocket cost is acceptable.
Use the following framework as a starting point:
Choose an HMO if:
- Budget is the primary concern and a lower premium matters most
- Care needs are routine and predictable
- There is no need to see out-of-network specialists
- Coordinated care through a PCP is not an obstacle
Choose an EPO if:
- Lower premiums than a PPO are a priority
- Specialist access without referrals is valued (confirm the plan is non-gated)
- All current providers are confirmed to be in-network
- There is no need for out-of-network coverage
Choose a PPO if:
- Provider flexibility is the top priority
- Out-of-state or out-of-network care is a real possibility
- There are established relationships with specific specialists
- The higher premium is affordable
Choose a POS if:
- Coordinated primary care is preferred alongside occasional out-of-network access
- A middle-ground cost is acceptable
- The referral requirement for in-network specialists is not a barrier
Choose an HDHP + HSA if:
- Health needs are minimal and the main concern is coverage for significant medical events
- Building a tax-advantaged medical savings fund is a goal
- The plan's deductible could be covered from existing savings if needed
Before finalizing a plan, confirm that existing providers are in-network using the insurer's online directory, check whether the plan is gated or non-gated (for EPOs), review prior authorization requirements for ongoing treatments, and compare total annual cost (premiums plus expected out-of-pocket costs) rather than monthly premium alone. Finding a doctor already in a plan's network before enrolling avoids disruptions to ongoing care.
Frequently Asked Questions
Is an EPO better than a PPO?
Neither is objectively better; they serve different needs. An EPO offers lower premiums but restricts coverage to in-network providers (except emergencies). A PPO costs more per month but provides out-of-network coverage and broader provider flexibility. An EPO is the stronger choice for someone with all their providers in-network who does not travel frequently; a PPO suits those who need out-of-network access or want maximum provider freedom.
Is EPO covered by insurance?
An EPO is a type of health insurance plan, not a service that insurance covers. Asking whether an EPO is "covered by insurance" typically means whether a specific procedure or visit is covered under an EPO plan. Coverage under an EPO applies to any medically necessary service performed by an in-network provider. Services obtained from out-of-network providers are not covered except in genuine medical emergencies.
Is an EPO plan a good idea?
An EPO plan is a practical option for individuals who prioritize lower monthly premiums over provider flexibility, have verified that their current providers are in-network, and do not anticipate needing out-of-network care. It becomes a less suitable fit when existing providers are outside the network, when out-of-state care is a regular need, or when the plan is "gated" and the member does not realize referrals are required. A doctor can advise on individual cases.
What is better, an HMO or EPO?
An HMO typically has lower premiums and predictable copays, but requires referrals to see specialists and offers no out-of-network coverage. An EPO generally has slightly higher premiums than an HMO but allows direct specialist access without referrals (on non-gated plans), while also restricting coverage to in-network care. For someone who sees specialists frequently and wants to skip the referral step, an EPO is often the more convenient option. For someone focused on the lowest possible monthly cost with minimal specialist needs, an HMO may be the better fit.
