Core Costs
- Premium
- The monthly fee you pay to have the insurance plan, regardless of whether you use it. Why it matters: This is the sticker price of coverage; the true cost includes deductible, copays, and coinsurance too.
- Deductible
- The amount you pay out of pocket for covered services before your plan starts paying. Resets annually. Why it matters: A high-deductible plan can look cheap on premium but expensive on the first illness of the year.
- Copay
- A fixed dollar amount you pay at the time of a covered service, e.g. $30 for a primary care visit. Why it matters: Copays typically apply even before the deductible is met.
- Coinsurance
- A percentage of the covered cost you pay after your deductible is met, e.g. plan pays 80%, you pay 20%. Why it matters: A $10,000 procedure at 20% coinsurance is a $2,000 bill even after the deductible.
- Out-of-pocket maximum
- The most you will pay in a plan year for covered in-network services. After you hit it, the plan pays 100% of covered costs. Why it matters: This is your true financial ceiling; know the number.
- Allowed amount
- The maximum amount your insurance considers reasonable for a covered service. Providers in-network agree to this amount; out-of-network providers can balance-bill you for the difference. Why it matters: This is why in-network is cheaper.
- Balance billing
- When an out-of-network provider bills you for the difference between their charge and the insurance allowed amount. Why it matters: Federal No Surprises Act (2022) limits this for emergency and certain non-emergency out-of-network care, but not all of it.
Network Terms
- In-network
- Providers who have a contract with your insurance plan at a discounted rate. Why it matters: Always cheaper. Confirm status before every visit.
- Out-of-network
- Providers without a contract with your plan. You typically pay more, sometimes 100%. Why it matters: Emergencies at out-of-network hospitals are protected by the No Surprises Act, but scheduled care is not.
- Provider directory
- The list of in-network providers your plan publishes. Why it matters: Often out of date. Confirm in-network status by calling both the practice AND the insurance member line before scheduling.
- Primary care physician (PCP)
- The doctor who coordinates your overall care and is often required to refer you to specialists on HMO plans. Why it matters: On HMO plans, no PCP referral = no coverage for the specialist.
- Referral
- Formal approval from your PCP for you to see a specialist. Why it matters: Required on most HMO plans. Not required on most PPO plans.
Plan Types
- HMO (Health Maintenance Organization)
- Requires a PCP and referrals to see specialists. Usually only in-network care is covered (except emergencies). Lower premiums, tighter rules. Why it matters: Cheapest for people who stay in-network and use a PCP.
- PPO (Preferred Provider Organization)
- No PCP requirement, no referrals for specialists, and out-of-network care covered at a higher cost-share. Higher premiums, more flexibility. Why it matters: Best for people who want to see specialists without PCP gatekeeping.
- EPO (Exclusive Provider Organization)
- Like a PPO but with no out-of-network coverage. Why it matters: Middle-ground option.
- POS (Point of Service)
- Hybrid of HMO and PPO: requires a PCP but allows some out-of-network care at a higher cost. Why it matters: Uncommon; read the specifics.
- High-Deductible Health Plan (HDHP)
- A plan with a high deductible (2026: $1,650 individual / $3,300 family minimum) and lower premium, HSA-eligible. Why it matters: Only makes sense if you rarely use care OR you can fully fund an HSA.
- HSA (Health Savings Account)
- Tax-advantaged savings account paired with an HDHP. Contributions are pre-tax; withdrawals for qualified medical expenses are tax-free. Why it matters: The most tax-advantaged account in the US tax code.
- FSA (Flexible Spending Account)
- Employer-sponsored pre-tax account for medical expenses. Use-it-or-lose-it by year-end (small carryover allowed). Why it matters: FSA is different from HSA; do not confuse them.
Claims and Approvals
- Explanation of Benefits (EOB)
- A statement from your insurance company after a claim showing what was billed, what was covered, and what you owe. Why it matters: NOT a bill. The bill comes separately from the provider.
- Claim
- A request for payment submitted by your provider (or you) to your insurance company. Why it matters: If a claim is denied, you can appeal.
- Prior authorization (pre-auth)
- Approval from your insurance required BEFORE certain services or medications, or the plan will not pay. Why it matters: MRI scans, surgeries, expensive drugs commonly require this. Confirm before the service.
- Medical necessity
- The insurance standard that a service must meet to be covered; usually "appropriate for diagnosis and treatment following accepted standards." Why it matters: The reason most claim denials happen.
- Denial
- Insurance decision not to pay a claim. Why it matters: 40-60% of appealed denials are overturned. Always appeal.
- Appeal
- The formal process to challenge a denial. First-level appeals go back to the insurer; external appeals go to a third party. Why it matters: Federal law requires insurers to allow appeals; you have a right to this.
- Coordination of benefits
- Rules for how two insurance plans divide the bill when you are covered by both. Why it matters: Common for children of divorced parents or spouses with separate insurance.
Pharmacy Terms
- Formulary
- The list of drugs your plan covers, usually organized into tiers by cost. Why it matters: Non-formulary drugs are typically not covered or covered at highest tier.
- Tier
- A category in the formulary (tier 1 = generic, tier 4 = specialty) that determines your copay. Why it matters: Same drug can cost $10 or $250 depending on tier.
- Generic drug
- Same active ingredient as brand-name drug, sold under the chemical name. Why it matters: 80-90% cheaper than brand; identical clinical effect for most drugs.
- Step therapy
- Insurance requirement that you try a cheaper drug first before they will cover a more expensive one. Why it matters: Can delay effective treatment; ask your doctor to appeal if the step-therapy drug is not appropriate.
- Specialty drug
- High-cost drugs for complex conditions (biologics, cancer drugs). Why it matters: Often require prior authorization AND special pharmacy.
Programs and Legal Terms
- Medicare
- Federal insurance for people 65+ and some under 65 with disabilities. Parts A (hospital), B (medical), C (Medicare Advantage), D (drugs). Why it matters: Enrollment rules and windows are strict; miss a window and face lifetime penalties.
- Medicaid
- State-federal insurance for low-income adults, children, pregnant women, elderly, and disabled. Why it matters: Coverage rules vary by state.
- CHIP (Children's Health Insurance Program)
- Low-cost coverage for kids in families that earn too much for Medicaid but cannot afford private insurance. Why it matters: Free or low-cost in most states.
- Marketplace / Exchange
- The Affordable Care Act (ACA) websites where individuals buy insurance (healthcare.gov or state site). Why it matters: Subsidies available up to 400% of federal poverty level.
- Open enrollment
- Annual window (usually Nov 1 - Jan 15) to enroll or change ACA marketplace plans. Why it matters: Miss it and you cannot enroll until next year unless you qualify for a special enrollment period.
- Special enrollment period (SEP)
- 60-day window after certain life events (marriage, job loss, having a baby) to enroll outside open enrollment. Why it matters: Do not miss the 60-day clock.
- HIPAA
- Health Insurance Portability and Accountability Act; the federal law that protects patient health information. Why it matters: You have a right to your own records and to know how your PHI is shared.
- EMTALA
- Federal law requiring hospitals to stabilize any patient with an emergency medical condition, regardless of insurance status or ability to pay. Why it matters: You cannot be turned away from an ER for lack of insurance.
- No Surprises Act
- 2022 federal law protecting patients from most surprise out-of-network bills for emergency care and certain non-emergency care at in-network facilities. Why it matters: Dispute a surprise bill under this law; you have rights.