A note on how health insurance works: Health insurance pays only on eligible medical expenses — services, treatments, and items your plan recognizes as covered under its terms. Not every healthcare cost you incur will qualify. Understanding what is and isn't eligible is one of the most important things to know before you need care.
Deductible
Annual ResetThe amount you pay out-of-pocket for covered services before your insurance plan begins to share costs. Once you hit this amount in a plan year, coinsurance or copays take over.
Note: Preventive care visits (like annual checkups) are usually covered before you meet your deductible.
Copay (Copayment)
Fixed AmountA fixed dollar amount you pay each and every time you use a specific covered service — the same amount, every single visit, regardless of what the actual bill is. Whether it's your first appointment of the year or your fifteenth, your copay for that service doesn't change.
In-network copays are typically lower than out-of-network copays. Specialist visits often carry a higher copay than primary care.
Coinsurance
Percentage SplitYour share of the cost of a covered service, expressed as a percentage — paid after you've met your deductible. Your insurance pays the rest.
Unlike a copay (which is always the same dollar amount), coinsurance scales with the size of the bill.
Allowed Amount
Pricing BasisThe maximum amount your insurance will pay for a covered service. Also called "eligible expense," "payment allowance," or "negotiated rate." If your provider charges more than this, you may owe the difference (called balance billing) unless your provider is in-network.
Out-of-Pocket Limit
Annual CapThe most you will ever pay in a single plan year in eligible medical expenses for covered, in-network services. Once you reach this limit, your insurance pays 100% for the rest of the year. This limit includes your deductible, copays, and coinsurance — but generally not your monthly premium.
Coinsurance
Reached
Premiums, balance billing charges, and costs for services your plan doesn't cover don't count toward this limit.
Eligible Medical Expenses
What Insurance Pays OnThe services, treatments, and health care costs that your insurance plan recognizes as covered under its terms. When your plan pays its share — and when your deductible, copays, and coinsurance count toward your out-of-pocket limit — it is always based on eligible medical expenses only.
Most medically necessary care from licensed providers is considered eligible. However, every plan is different, and certain types of care are commonly excluded. Services that are often not considered eligible medical expenses include:
- Experimental or investigational treatments — therapies not yet accepted as standard medical practice
- Homeopathic and naturopathic remedies
- Many holistic or alternative therapies (though some plans may cover certain options like acupuncture or chiropractic care)
- Cosmetic procedures not related to illness or injury
- Elective services deemed not medically necessary
- Over-the-counter items, vitamins, and general wellness products
Important: This list is general. What counts as an eligible expense varies by plan. Always check your Summary of Benefits and Coverage (SBC) — or ask me — before assuming a service is covered.
Network
Provider AccessThe group of doctors, hospitals, clinics, and other health care providers that have a contract with your insurance company. These providers agree to accept negotiated rates, which typically means lower costs for you.
In-Network Provider
Preferred ProviderA doctor, specialist, hospital, or other health care provider who has a contract with your insurance plan. Going in-network means you pay less — your copays, coinsurance, and deductible amounts will all be lower than if you went out-of-network. Also called a "preferred provider."
Out-of-Network Provider
Provider AccessA provider who does not have a contract with your insurance plan. You can often still see them, but you'll pay significantly more — and some plans (like HMOs and EPOs) won't cover out-of-network care at all except in emergencies.
Preventive Care
ACA-Required BenefitRoutine services designed to prevent illness or detect problems early — before you have symptoms. Under the ACA, most health plans are required to cover a defined list of preventive services at $0 cost to you, even before your deductible is met.
Common examples include annual wellness visits, recommended vaccinations, certain screenings (like blood pressure, cholesterol, and cancer screenings), and preventive medications. The specific list varies by age, sex, and risk factors.
Important: "Preventive" has a specific definition. If your doctor addresses a new symptom or existing condition at the same visit, part of that visit may be billed as diagnostic — and cost-sharing may apply.
Diagnostic Test
Cost-Sharing AppliesA test or service ordered because you have a symptom, a known condition, or a risk factor your doctor wants to investigate. Unlike preventive care, diagnostic services are subject to normal cost-sharing — meaning your deductible, copay, or coinsurance will typically apply.
Example: A routine colonoscopy at age 45 with no symptoms is preventive — $0. If you have symptoms and your doctor orders the same test to investigate, it becomes diagnostic — and you may owe a portion of the cost.
Primary Care Physician (PCP)
Your Main DoctorYour go-to doctor for general health care — annual check-ups, common illnesses, chronic condition management, and referrals to specialists. PCPs include family medicine doctors, internists, general practitioners, and sometimes OB-GYNs or pediatricians.
On some plan types (like HMOs), you are required to choose a PCP, and you must get a referral from them before seeing a specialist. On other plans (like PPOs), you can see any provider without going through a PCP first.
Specialist
Provider AccessA doctor with advanced training in a specific area of medicine — such as cardiology, dermatology, orthopedics, or oncology. Specialist visits often have a higher copay than PCP visits.
Depending on your plan type, you may need a referral from your PCP before you can see a specialist and have your insurance cover it. Always verify before scheduling.
How Plan Types Compare
Quick ReferenceThe four most common plan structures each handle provider networks and referrals differently. Here's a quick overview:
| Plan Type | See Any Doctor? | Need a Referral? | Out-of-Network Covered? |
|---|---|---|---|
| HMO | In-network only | Yes — PCP required | Emergency only |
| PPO | In- or out-of-network | No | Yes, at higher cost |
| EPO | In-network only | Usually no | Emergency only |
| HSA / HDHP | Varies by underlying plan | Varies by underlying plan | Varies by underlying plan |
HMO — Health Maintenance Organization
Plan TypeAn HMO requires you to choose a Primary Care Physician (PCP) from within the plan's network. Your PCP manages your care and provides referrals when you need to see a specialist. In most cases, you must stay within the network — out-of-network care is not covered except in a true emergency.
Trade-off: HMOs tend to have lower premiums and predictable copays, but less flexibility. They work best if you have a trusted doctor in the network and don't expect to need specialists frequently.
Example: You visit your PCP for a persistent cough. They refer you to a pulmonologist in the network. Your HMO covers the specialist visit at the in-network rate. If you had gone directly to an out-of-network specialist, it would likely not be covered.
PPO — Preferred Provider Organization
Plan TypeA PPO gives you the most flexibility. You can see any doctor or specialist — in-network or out-of-network — without a referral. You'll pay less when you stay in-network, but the plan still provides some coverage for out-of-network providers.
Trade-off: PPOs typically come with higher premiums than HMOs. The flexibility is the selling point — if you have existing relationships with specific doctors or specialists, a PPO may be worth the extra cost.
Example: You want to see a specialist at a well-known medical center that isn't in your plan's network. With a PPO, you can go — you'll just pay more out-of-pocket than if you stayed in-network.
EPO — Exclusive Provider Organization
Plan TypeAn EPO is a hybrid: like a PPO, you typically don't need a referral to see a specialist. But like an HMO, you must stay within the plan's network — out-of-network care is not covered (except emergencies).
Trade-off: EPOs often fall between HMOs and PPOs in price. They offer more freedom than an HMO (no referral required) but less than a PPO (no out-of-network coverage). They're a good fit if you're comfortable staying in-network and want direct specialist access.
Example: You want to see a dermatologist without going through your primary care doctor first. With an EPO, you can — as long as the dermatologist is in your plan's network.
HSA-Eligible Plan — Paired with a High Deductible Health Plan (HDHP)
Plan Type + Savings AccountWhen you see "HSA" in a health plan name, it means the plan is structured as a High Deductible Health Plan (HDHP) — one that qualifies you to open a Health Savings Account (HSA).
An HDHP has a higher deductible than traditional plans, which typically means lower monthly premiums. In exchange for that higher deductible, the IRS allows you to open an HSA — a special tax-advantaged savings account you can use to pay for eligible medical expenses.
Do you have to open an HSA? No. You can enroll in an HSA-eligible (HDHP) plan and choose not to open an HSA bank account. You won't get the tax savings, but the plan itself may still make sense if the premium and benefit structure works for your situation. You're simply not required to use the savings account feature.
HSA funds roll over year to year — they never expire. After age 65, you can use HSA funds for any purpose (not just medical) without penalty, though non-medical withdrawals are subject to income tax.
Example: You're healthy, rarely use medical care, and want to lower your monthly premium. An HSA-eligible plan might fit well — you pay less each month, and if you do open an HSA, you can save that money tax-free for future health expenses or retirement.