Health Insurance Plans Decoded: HMO, PPO, HSA, and What Each One Really Costs You

Roughly 26.7 million Americans under 65 had no health coverage in 2024, and 61.7 percent of the uninsured said the same thing when asked why: they could not afford it.⁶ What that number usually hides is how many people who do have coverage picked the wrong plan, overpaid for years, and never knew it. The premium line on the enrollment form is not the price of health insurance. It is one of three levers, and choosing on premium alone is how a $450-a-month plan turns into a $9,000-a-year surprise.

Let's start with how the machine actually works, then run the actual numbers on three plan types side by side.

The three numbers that determine what you actually pay

Every health insurance plan reduces to three moving parts.

The premium is the monthly cost you pay to keep coverage active, whether you use it or not. According to the 2023 KFF Employer Health Benefits Survey, the average employer-sponsored family plan ran $23,968 per year in total premium, with workers contributing about $6,575 of that.¹ For plans purchased on the individual market the premiums are higher still.

The deductible is what you pay out of pocket before the insurance company begins covering services. The 2023 KFF survey found the average single-coverage deductible at employer plans was $1,735.² Until you clear that number, the insurer sits on the sideline.

The copay (or coinsurance) is what you pay per visit or service after the deductible clears. A $40 copay means you hand over $40 every time you see a primary care doctor, regardless of the underlying bill. Coinsurance is a percentage split instead: 20 percent coinsurance means you cover one-fifth of costs once the deductible is met, and the insurer covers the rest.

The fourth number that completes the picture is the out-of-pocket maximum. Once you have spent enough in deductibles, copays, and coinsurance during the calendar year, the insurer covers 100 percent of in-network costs for the rest of that year. It is your worst-case ceiling.

HMO vs. PPO: the core tradeoff

The two dominant plan structures each make a different bet about how you use healthcare.

A Health Maintenance Organization (HMO) charges a lower premium by restricting you to a specific network of doctors and hospitals. You choose a primary care physician who coordinates your care, and you need a referral to see a specialist. Go outside the network without pre-authorization and the plan covers nothing. HMOs emerged in the U.S. as a cost-control mechanism in the 1970s and have remained the lower-cost option ever since.⁴ In the 2023 KFF survey, about 13 percent of covered workers were enrolled in them.¹ The appeal is cost. The catch is inflexibility, which matters if your specialist sits outside the network or you travel frequently.

A Preferred Provider Organization (PPO) charges a higher premium in exchange for flexibility. You can see any doctor without a referral, in-network or out, though in-network care costs you less. PPOs accounted for 47 percent of covered workers in 2023, making them the most popular plan type by a wide margin.¹ For anyone managing a chronic condition or needing regular specialist access, the higher monthly cost can pay off once you account for avoided referral friction and out-of-network coverage.

The real comparison is not between the two premium lines. It is between the two total-cost equations once you plug in your expected healthcare usage for the year.

Running the numbers: one scenario, three plans

Consider a 35-year-old with roughly $2,000 in typical annual healthcare spending: a couple of doctor visits, some prescriptions, and preventive care. Three plans are on the table.

Plan A is an HMO with a $250 monthly premium and a $3,000 deductible. Annual premium: $3,000. This person's $2,000 in expenses never clears the $3,000 deductible, so the insurer pays nothing on services. Total annual cost: $5,000.

Plan B is a PPO with a $450 monthly premium and a $1,500 deductible. Annual premium: $5,400. The $2,000 in expenses clears the $1,500 deductible. For the remaining $500 above the deductible, the plan covers 80 percent, leaving an out-of-pocket share of $100. Total annual cost: $7,000.

Plan C is an HSA-eligible High-Deductible Health Plan, or HDHP (meaning the plan meets IRS minimums: in 2025, a deductible of at least $1,650 for self-only coverage)³ with a $280 monthly premium. Annual premium: $3,360. The $2,000 in expenses falls under the $2,000 deductible, so the insurer pays nothing on services. But the account holder contributes $3,000 to a Health Savings Account this year. In a 24 percent federal tax bracket, that contribution saves $720 in taxes. After the tax offset, the effective annual cost is $3,360 in premium plus $2,000 in medical spending minus $720 in tax savings, which comes to $4,640.

With average healthcare usage, the HSA plan is cheapest by roughly $360 compared to the HMO and $2,360 compared to the PPO. The tax deduction on HSA contributions is the deciding factor.³

Now run the same three plans with $5,000 in healthcare expenses, as you might expect after a surgery or an ongoing diagnosis. The HMO's lower deductible and out-of-pocket maximum mechanics mean it absorbs costs sooner, and its total lands around $6,400. The PPO's higher premium is a bigger anchor, and its total lands around $7,600. The HSA plan becomes more expensive once high expenses exhaust the HSA balance, landing near $7,640. With heavy healthcare use, the HMO wins. The lesson is that the right plan depends on your expected spending volume, and you have to run both the low-use and high-use scenarios before you enroll.

How the deductible clock works

One detail that catches people by surprise: the deductible resets on January 1 every year, not on your enrollment anniversary.

Take a $2,000 deductible. You accumulate $1,500 in covered expenses between January and July but never clear the threshold, so the insurer has not paid a dollar toward services. Then in September you need a procedure. You pay the remaining $500 to close out the deductible and the insurer covers its share of the rest. Total exposure for the year, managed.

Flip the scenario. The procedure comes in November, and you spend the $2,000 to clear the deductible late in the year. On January 1 the clock resets to zero. Follow-up care in February means you start over toward a fresh $2,000. Where timing gives you a choice, concentrating major non-emergency procedures into the same calendar year after you have already met the deductible can save real money.

Preventive care operates on different rules. Under federal law, plans must cover a defined list of preventive services at no cost to the patient: annual physicals, vaccinations, and certain screenings do not count against the deductible.³ The common mistake is skipping these visits under the impression they will cost money. They do not, and skipping them lets treatable conditions go undetected until they become expensive ones.

The HSA: a tax structure worth understanding

A Health Savings Account is not a plan type. It is an account you can open alongside any qualifying HDHP, and its tax treatment is unusual. Contributions are tax-deductible going in, the money grows tax-free inside the account, and qualified medical withdrawals are tax-free coming out.³ That is three layers of tax protection in one account, which no other savings vehicle in the tax code offers simultaneously.

For 2025, the IRS allows contributions of up to $4,300 for self-only HDHP coverage and $8,550 for family coverage, with an additional $1,000 catch-up for those 55 and older.³

The long-run strategy that healthy contributors often use is to pay routine medical expenses out of pocket, let the HSA balance grow invested in low-cost index funds, and tap it for larger costs in later years. After age 65, HSA funds can be withdrawn for any purpose without the 20 percent early-withdrawal penalty that applies below that age; you would simply owe ordinary income tax on non-medical withdrawals, making the account function much like a traditional retirement account. For a 35-year-old who contributes $4,000 per year and earns a 7 percent average return, the account could reach roughly $190,000 over 20 years, available tax-free for medical costs in retirement.

The trap to watch: the HSA only works if the high deductible is actually funded. People who enroll in an HDHP for the premium savings, never contribute to the account, and then face a $3,000 bill before the deductible clears have the worst of both worlds. The premium savings are real only when the HSA backstops them.

What insurance does not cover

Every plan carries exclusions, and reading the Summary of Benefits and Coverage document before you enroll is worth the time it takes. Cosmetic procedures are almost universally excluded. Alternative treatments like acupuncture are covered under some plans and excluded from others. Experimental treatments generally require prior authorization, and many are denied. Fertility treatments, weight-loss programs, and long-term care beyond short stays are typically not covered. Out-of-country care varies by plan, with most domestic plans offering only emergency coverage abroad.

The IRS allows a deduction for qualifying medical expenses, but only the portion exceeding 7.5 percent of your adjusted gross income, and only if you itemize deductions rather than taking the standard deduction.⁵ For most households the standard deduction is higher, so the medical expense deduction rarely helps, but it can matter in a high-cost year.

Where medical debt actually starts

Four in ten American adults currently carry health care debt, and among the uninsured that figure rises to 62 percent.⁷ Most of that debt traces not to catastrophic events but to the accumulated weight of deductibles, copays, and bills that arrived before anyone ran the annual-cost arithmetic.

The out-of-pocket maximum is the one number that protects you from true financial catastrophe: once you have hit it within the plan year, the insurer covers 100 percent for the remainder. Knowing yours before you face a serious diagnosis is the difference between planning and panic.

Open enrollment comes around once a year. The plan that looked fine last year may have changed its network, adjusted its deductible, or shifted its premium. Running the three-number comparison, premium times 12 plus expected deductible plus expected copays, takes twenty minutes and can save thousands. Most people spend more time researching a television than a health plan that will cost them $6,000 to $25,000 over the next twelve months. Do the math before the window closes.