Health Insurance, Explained

Health insurance might be the single most confusing thing in personal finance. It comes loaded with words nobody defines: deductible, copay, coinsurance, network. And the stakes feel high because they are. But it's really just a few moving parts, and once you see how they fit together over a year, the whole thing clicks. (If you haven't read how insurance works in general, start there; this builds on it.)

Picture a single year of having a health plan. Here's what each term means and when it kicks in:

• Premium: what you pay every month just to have the plan, whether or not you see a doctor.
• Deductible: the amount you pay out of pocket for care before the plan starts sharing the cost. Early in the year, you're often paying this down yourself.
• Copay: a flat, fixed fee for a specific service, like a set amount for a doctor visit or a prescription. You know it in advance.
• Coinsurance: your share of a bill as a percentage, once you've met your deductible. If your coinsurance is 20%, you pay 20% and the plan pays the rest.
• Out-of-pocket maximum: the most you'll have to pay in a year for covered care. Once you hit it, the plan covers 100% of covered costs for the rest of the year. This is the safety net under everything.

Put it together: you pay your premium every month no matter what. When you need care, you first work through your deductible, then split costs with the plan through copays and coinsurance until you reach your out-of-pocket maximum. After that, the plan covers the rest of the year. That ceiling caps how bad a year can get.

The out-of-pocket maximum is the most important number on a health plan. It's the worst-case price tag for a terrible health year, and capping that worst case is exactly what insurance is for.

Insurers strike deals with certain doctors, hospitals, and pharmacies. That group is the plan's network. Staying in-network means you pay the lower, agreed-on prices. Going out-of-network can cost dramatically more, and sometimes the plan won't cover it at all. Before you book anything non-urgent, check that the provider is in your network.

That difference shows up in the two most common plan types:

• HMO: usually cheaper, but you generally have to stay in-network and often pick a primary doctor who refers you to specialists. Less flexibility, lower cost.
• PPO: usually pricier, but you get more freedom to see specialists directly and to use out-of-network providers (still at a higher cost).

You don't buy health insurance just anywhere. It tends to come from one of a few places:

• A job. Many employers offer a health plan and pay part of the premium for you. If you have this option, it's usually the easiest place to start.
• The government marketplace. At HealthCare.gov (or your state's own marketplace), you can shop for a plan on your own. Many people qualify for help that lowers the cost, so it's worth checking even if you assume you can't afford it.
• Medicaid. If your income is low, you may qualify for Medicaid, which provides coverage at little or no cost. Eligibility and how to apply vary by state.
• A parent's plan. Young adults can stay on a parent's health plan until they turn 26, which can be the simplest and cheapest option while it lasts. Turning 26 covers the hand-off when that clock runs out.

It's tempting to skip insurance when you're young and healthy, because the premium feels like money for nothing. But a single accident or serious illness can produce a bill larger than most people earn in years, and being uninsured doesn't make that bill disappear. It leaves you facing it alone.

Because low-cost and free options exist for a lot of people, being uninsured is often a choice you don't have to make. Spend ten minutes finding out what you qualify for, then use How to Choose a Health Plan to compare your options.