Once a year your benefits portal — or HealthCare.gov — hands you a list of plans with names like Silver PPO and Bronze HMO and asks you to pick one for the next twelve months. The labels look like code, but they encode just three things: how the plan splits costs with you, which doctors you can see, and how much of a bad year lands on you.
When the window opens, and what happens if you miss it
| Where you get coverage | Open enrollment | If you miss it |
|---|---|---|
| Your employer's plan | Your employer sets the window; the dates are in your benefits portal | You keep this year's plan until the next window, unless a qualifying life event (marriage, a baby, losing other coverage) opens a special enrollment window of at least 30 days |
| HealthCare.gov marketplace | November 1 to January 15 | A qualifying life event gives you 60 days to enroll; losing Medicaid or CHIP gives you 90 days |
Outside those windows you cannot switch plans, so the choice you make in the window is the one you live with. If your state runs its own marketplace, its dates are on the state site. Everything below is about making that choice with numbers instead of guesses; how health insurance actually works covers what happens to a bill once you are enrolled.
Metal tiers: how the plan splits the cost
Marketplace plans, and many employer menus, sort into metal tiers. The tier is not a quality rating — HealthCare.gov says it plainly: the name of a plan category has nothing to do with its quality of care. It tells you, averaged across everyone on the plan, how the bills split between the insurer and you.
| Tier | Plan pays | You pay | Premium |
|---|---|---|---|
| Bronze | 60% | 40% | Lowest |
| Silver | 70% | 30% | Moderate |
| Gold | 80% | 20% | Higher |
| Platinum | 90% | 10% | Highest |
Two marketplace details matter here. Income-based cost-sharing reductions — extra savings that shrink your deductible and copays — apply only if you enroll in a Silver plan. And a fifth category, Catastrophic, is open only if you are under 30 or hold a hardship or affordability exemption.
Plan types: HMO, PPO, EPO
The second label is about which doctors you can see and whether you need permission first.
| Type | Referral to see a specialist? | Out-of-network care covered? | What you get |
|---|---|---|---|
| HMO | Yes, from your primary care doctor | Emergencies only | Lower cost, a coordinating doctor, a narrower network |
| PPO | No | Yes, at a higher cost to you | The most freedom, the highest premium |
| EPO | No | Emergencies only | PPO-style freedom inside an HMO-style network |
Pick by how you use care. If you see the same in-network doctors every year, an HMO's lower premium costs you nothing in freedom you would use. If you have a specialist you will not give up, confirm the plan covers them before the tier or the premium enters the picture.
In-network vs. out-of-network
Insurers negotiate prices with a specific list of doctors, hospitals and labs — the network. In-network care is billed at the negotiated rate and split the way the plan promises. Out-of-network care is either not covered at all (HMO and EPO, outside emergencies) or covered at a worse split (PPO) — and the provider is free to bill you the full sticker price.
The four numbers on every plan
Every plan comes down to four figures, and you need all four to compare anything.
- Premium — what you pay every month whether or not you see a doctor. Put it in your monthly budget with the budget calculator; it is a fixed bill like rent.
- Deductible — what you pay for care each year before the plan starts paying its share.
- Copay or coinsurance — your share after the deductible: a flat amount per visit (copay) or a percentage of the bill (coinsurance), such as 20%.
- Out-of-pocket maximum — the most you pay for covered, in-network care in a year. Once you reach it, the plan pays 100%.
A lower premium comes with a higher deductible and a higher out-of-pocket maximum, and the other way round. You pay either steadily (premium) or when you get sick (deductible and coinsurance); the plan only changes the timing and the ceiling. The way to compare plans is to total all four numbers for a light year and a heavy one.
Is the cheaper plan a high-deductible health plan?
For 2025 a plan counts as a high-deductible health plan (HDHP) when its deductible is at least $1,650 for self-only coverage or $3,300 for family coverage, and its out-of-pocket maximum is no higher than $8,300 for self-only coverage or $16,600 for family coverage. Plan A above qualifies (a $3,500 deductible and a $7,500 out-of-pocket maximum); Plan B's $1,500 deductible does not.
That label unlocks a health savings account: on an HDHP you can put up to $4,300 (self-only) or $8,550 (family) into an HSA for 2025, and the money rolls over forever. If Maria takes Plan A, the premium she saves has somewhere useful to go, and it skips income tax and FICA on the way in. HSAs, FSAs and tax-advantaged health money shows that math.
Reading the Summary of Benefits and Coverage
Every plan comes with a standardized document, the Summary of Benefits and Coverage (SBC), built so you can compare plans field by field. Read the same lines on each one: premium, deductible, out-of-pocket maximum, the copay for a primary care visit and a specialist visit, the coinsurance percentage, and whether your doctors and prescriptions are in the network. The SBC also includes sample scenarios, such as having a baby or managing a chronic condition, priced out for that plan — a ready-made version of Maria's heavy-year math.
Line the SBCs up, fill in a two-column table like Maria's, and the wall of names turns into a decision with a number on it.