Health insurance is a contract that requires an insurer to pay some or all of a person's healthcare costs in exchange for a premium. Its main purpose is to protect you from high, unexpected medical bills. Think of it like a financial safety net. You pay a predictable amount regularly, and in return, you get help paying for expensive care when you need it.

To understand your health plan, you need to know the language. These key terms define how you and your insurance company share the costs of your care.

After you pay your deductible, you usually only pay a copayment or coinsurance for covered services, and the insurance company pays the rest.

This limit doesn't include your monthly premiums. It's the ceiling on what you'll pay for your share of care during the year.

Health insurance plans are structured in different ways, primarily based on how you can access doctors, specialists, and hospitals. This structure is often called the plan's "network."

Let's break down the most common types:

• HMO (Health Maintenance Organization): These plans often have lower premiums. They require you to use doctors and hospitals within their network and choose a Primary Care Physician (PCP). To see a specialist, you typically need a referral from your PCP.

• PPO (Preferred Provider Organization): These plans offer more flexibility. You don't need a PCP or referrals. You can see providers both in and out of the network, but your costs will be lower if you stay in-network.

• EPO (Exclusive Provider Organization): This is a hybrid. Like a PPO, you don't need a PCP or referrals. But like an HMO, you must use doctors in the network (except in emergencies).

• POS (Point of Service): This plan combines features of HMOs and PPOs. You may need a PCP and referrals, but you have the option to go out-of-network for care, usually at a higher cost.

• Indemnity (Fee-for-Service): This is the most flexible and often most expensive type. You can see any provider without referrals. The plan pays a percentage of the charges, and you pay the rest.

The government also provides health insurance programs for specific populations. These are funded by federal and state taxes.

Medicare is a federal program primarily for people aged 65 or older, as well as some younger people with certain disabilities or diseases.

Medicaid provides health coverage to millions of Americans, including eligible low-income adults, children, pregnant women, elderly adults, and people with disabilities. It's funded jointly by states and the federal government.

CHIP (Children's Health Insurance Program) offers low-cost health coverage for children in families who earn too much to qualify for Medicaid but cannot afford to buy private insurance.

Understanding these core concepts is the foundation for making informed decisions about your healthcare.