Insurance companies don't write their paperwork to be understood. They write it to be unfalsifiable, which is a different problem.
Sections
- The terms that affect what you pay out of pocket
- The terms that affect what’s actually covered
- The terms that affect where you can go
- The paperwork terms
- The federal and regulatory terms
- The plan-type acronyms
- The terms that don’t matter, and the terms designed to look like they do
- The list you actually need to memorize
Insurance companies don’t write their paperwork to be understood. They write it to be unfalsifiable, which is a different problem. Every page of an explanation of benefits, every plan summary, every “welcome to your coverage” packet uses about forty terms that all sound like they matter, when really only six or eight of them actually change what happens to you when you walk into a doctor’s office or pick up a prescription. The rest is functional noise, padding, regulatory language that exists because some lawyer thirty years ago decided it had to, or marketing copy designed to make a plan sound generous when it isn’t.
What follows is the subset of insurance vocab that actually moves the needle for you as a patient. Memorize these, ignore the rest. Or read them all, the noise is interesting in the way watching the gears of a slot machine is interesting, but if you want the short version, scroll to the closer.
The terms that affect what you pay out of pocket
This is the wallet bucket. Four words, and if you understand them you understand the math of every plan you’ll ever look at.
Deductible. The amount you pay yourself before the insurance company pays anything. If your deductible is $3,000, the first $3,000 of medical bills in a calendar year come out of your pocket. After that the insurance starts kicking in, but only partially, which is where the next term comes in. Deductibles reset every January 1st, which is why dentists and elective surgeries get suddenly busy in December (everyone’s already cleared their deductible and wants to use it before it resets).
Coinsurance. The percentage you keep paying after the deductible is met. A typical plan might be 80/20 coinsurance, meaning the insurance pays 80%, you pay 20%, of whatever the bill is. The bill in question is the negotiated rate, not the sticker price, which is one of the rare ways insurance actually does work in your favor. The sticker price for a single therapy session might be $350. The negotiated in-network rate is $130. Your 20% is $26, not $70. Good. But coinsurance keeps adding up, session after session, until…
Out-of-pocket maximum (OOP max). The ceiling. Once you’ve spent this much in a year, including your deductible and all your coinsurance, the insurance pays 100% of in-network costs for the rest of the calendar year. This is the most important number on any plan, more important than the monthly premium for anyone who actually uses healthcare. If you’re young and healthy and going to use your insurance twice a year, premium matters more. If you’re starting a course of therapy, or you take a medication that costs real money, or you’re getting any kind of consistent care, the OOP max is the number that decides what your year actually costs. Pay attention to it.
Copay. A flat fee for a specific service, usually instead of coinsurance for that service. $30 for a primary care visit, $50 for a specialist, $15 for a generic prescription. Copays sometimes count toward your deductible and sometimes don’t, depending on the plan, which is the kind of detail that is exactly as annoying to figure out as it sounds. Read your plan documents or call the number on the back of the card. The phone agents actually do know this stuff.
The terms that affect what’s actually covered
This is where insurance companies do most of their quiet rationing. The plan technically covers therapy or covers a medication, but covered doesn’t necessarily mean you can get it without a fight.
Formulary. The list of drugs your plan will pay for. Every insurance plan has one. If your medication is on the formulary, the plan covers it. If it isn’t, you either pay out of pocket (which can be hundreds or thousands a month for newer drugs) or get your prescriber to file paperwork begging the insurance to cover it as an exception. Formularies change every year. The medication that was covered in December might not be covered in January, which is one of the genuine annoyances of insurance-mediated medicine.
Tier. Within the formulary, drugs are sorted into tiers. Tier 1 is usually generics, cheapest. Tier 2 is preferred brand-name drugs, more expensive. Tier 3 is non-preferred brand-name, more expensive still. Tier 4 and 5 are specialty drugs, often biologics, often very expensive even with insurance. Most psychiatric medications you’d actually take are tier 1 or tier 2.
Prior authorization (PA). The insurance company requires your prescriber to submit paperwork justifying why you need this specific medication before they’ll pay for it. PA is genuinely useful in a couple of cases (it stops sloppy prescribing of expensive drugs when a cheaper one would work fine) and a pain in the ass in most cases. For psychiatric meds, PA shows up most often for stimulants, newer antidepressants, and any branded medication where a generic exists. Your prescriber’s office handles the paperwork, you mostly just wait. Two days to two weeks is typical.
Step therapy. The insurance won’t pay for medication B until you’ve tried medication A first and it didn’t work. This is a real thing that affects real care. If your prescriber wants to put you on Vyvanse but step therapy requires you try generic Adderall first, you try generic Adderall first. Sometimes this is fine, sometimes it costs you three months of feeling like garbage on a med that wasn’t right for you. It’s one of the more legitimate frustrations with managed care.
Medical necessity. The phrase that means “the insurance company agrees this is needed, not optional.” Almost everything has to clear a medical-necessity bar to be covered. The bar is usually low for routine stuff and high for anything expensive. Denials almost always cite a lack of medical necessity, which is mostly insurance-speak for “we don’t want to pay for this and we have a paragraph that lets us not.”
The terms that affect where you can go
This is the geography of your plan. Who you can see, where you can be seen, and what happens when you go somewhere outside the lines.
In-network. A provider or facility that has a contract with your insurance company to accept their negotiated rates. In-network is almost always cheaper, sometimes dramatically so. The list of in-network providers is on your insurance company’s website, although the lists are notoriously out of date and providers come and go from networks regularly. Always confirm with the provider’s office directly that they take your specific plan, not just your insurance company. Aetna has dozens of plans and a provider can be in-network for some and out-of-network for others.
Out-of-network (OON). Everyone else. If you see an out-of-network provider, you may pay full sticker price, or you may have OON benefits that cover a percentage of an “allowed amount” that’s usually less than the actual bill, and you owe the rest. Out-of-network deductibles and OOP maxes are usually separate from your in-network ones, and they’re usually higher. OON care can absolutely make sense in some cases (a specific therapist you click with, a specialist who actually takes time with you) but the math is real and worth running before committing.
Single case agreement (SCA). A one-off contract between your insurance and an out-of-network provider that lets you see them at in-network rates for a specific course of treatment. SCAs exist mostly for situations where the insurance can’t find an in-network provider with the right specialty within a reasonable distance, which happens regularly in mental health. If your insurance directory has three child psychiatrists in your state and all of them are full, you can sometimes argue for an SCA with someone out-of-network. The provider’s billing office is usually the one who knows how to file it.
Balance billing. The provider bills you for the difference between what they charged and what the insurance paid. Used to be common with out-of-network ER doctors, anesthesiologists, that kind of thing. Mostly illegal now for emergency care.
No Surprises Act. Federal law that took effect in 2022. Protects you from balance billing in most emergency situations and from getting hit with out-of-network bills when you go to an in-network facility and the anesthesiologist or radiologist happens to be out-of-network. Good law, actually does what it says, doesn’t get talked about enough. If you ever get a surprise bill from an emergency room or an in-network hospital stay, look it up before you pay.
The whole game is that the plan documents are written so that “covered” can mean five different things depending on which paragraph you’re reading. Covered before the deductible. Covered after prior authorization. Covered if you tried something cheaper first. Covered at out-of-network rates. Covered as long as it’s deemed medically necessary by a reviewer at a desk in another state. The word “covered” by itself promises you almost nothing.
The paperwork terms
Insurance generates a lot of paper, most of which looks like a bill, isn’t, but is designed to look that way. Knowing which ones are real bills matters.
EOB (explanation of benefits). This is the most-misunderstood document in healthcare. An EOB looks exactly like a bill. It has dollar amounts, your name, dates of service, a “patient responsibility” line. It is NOT a bill. It’s a statement from your insurance company explaining what they paid, what they didn’t, and what you might owe. The actual bill comes separately from the provider’s office. If you get an EOB saying you owe $400, don’t pay it. Wait for the actual bill from the doctor’s office, which is the real one and is sometimes lower than the EOB suggests because of billing adjustments. The EOB will literally say “this is not a bill” somewhere on it, usually in a place you have to squint to find.
CMS-1500. The standard claim form that providers (outpatient, mostly) submit to insurance companies to get paid. You’ll never fill one out yourself. You’ll occasionally see the form number referenced in plan documents. It’s worth knowing the name exists so the term doesn’t intimidate you when it shows up.
ICD-10 code. The diagnosis code your provider attaches to your visit. F33.1 is recurrent major depression, moderate. F90.0 is ADHD, inattentive type. There are about 70,000 ICD-10 codes covering every possible diagnosis. The code matters because it’s how the insurance company decides whether the visit is covered. Some plans cover treatment for F33 codes but require extra paperwork for F90 codes. Most patients never have to think about ICD-10 codes, but they show up on EOBs and bills and it’s nice to be able to translate them.
CPT code. The procedure code. What was actually done at the visit. 99213 is a standard follow-up office visit. 90834 is a 45-minute psychotherapy session. 90838 is a 60-minute therapy session added onto a medication visit. CPT codes determine how much the provider gets paid and therefore how much shows up on your EOB. If you ever look at a bill and the dollar amount seems wrong, the CPT code is the place to start, occasionally a wrong code gets submitted and a quick call to billing fixes it.
The federal and regulatory terms
These are the laws that govern what insurance can and can’t do to you. Most patients never need to invoke them. A couple are worth knowing because they’re real protections you might need to enforce.
Mental Health Parity Act (MHPAEA, 2008). Federal law requiring that mental health and substance use coverage be “no more restrictive” than medical/surgical coverage. In practice, this means your plan can’t have a separate (worse) deductible for therapy, can’t limit therapy visits in a way it doesn’t limit physical therapy visits, can’t require prior auth for psychiatric meds without also requiring it for comparable medical meds. Insurance companies routinely violate parity in small ways. Enforcement is uneven. If you’re getting denied for mental health care and your physical health care of comparable cost goes through without issue, parity is the law to mention when you appeal.
HIPAA. Health Insurance Portability and Accountability Act. The privacy law. HIPAA controls what your providers and your insurance can do with your medical information. The thing most people get wrong about HIPAA is what it doesn’t do. It doesn’t prevent your employer from finding out you used your health insurance, it doesn’t prevent insurance from sharing records with other insurance companies in certain circumstances, and it doesn’t apply to non-medical entities like your gym or your fitness tracker app. It’s a useful privacy floor, not a wall.
ERISA. A 1974 federal law that governs employer-sponsored health plans. Mostly relevant because ERISA plans get sued in federal court, not state court, and have specific appeal procedures you have to follow. If your insurance through work denies a claim and you want to fight it, the appeal process is dictated by ERISA. You probably won’t need to know this name unless you’re appealing a denial, but when you are, knowing the word saves you time.
ACA marketplace. The Affordable Care Act exchanges where you buy individual insurance if you don’t get it through work. The marketplace at healthcare.gov in most states, or your state’s own exchange. ACA plans have to cover the ten “essential health benefits,” which include mental health and prescription drugs. This is real coverage, not optional add-ons. ACA plans also can’t deny you for pre-existing conditions, which used to be the default for individual insurance and was genuinely terrible.
The plan-type acronyms
HMO, PPO, EPO, POS, HDHP. Five letters that determine the entire structure of how you access care. Most people learn these the hard way after switching jobs.
HMO (Health Maintenance Organization). You pick a primary care provider. To see a specialist you need a referral from your PCP. In-network only, no out-of-network coverage except emergencies. Cheaper monthly premiums, more friction to actually use. HMOs are common with Kaiser and some employer plans in Oregon and Washington.
PPO (Preferred Provider Organization). You can see anyone, no referrals needed. In-network is cheaper, out-of-network is covered but at a worse rate. More expensive monthly premiums, way less friction. Most “good” employer plans are PPOs.
EPO (Exclusive Provider Organization). Like a PPO but with no out-of-network coverage at all, except for emergencies. Cheaper than a PPO, more flexible than an HMO. Common in ACA marketplace plans.
POS (Point of Service). A hybrid. You pick a PCP like an HMO, but you can see out-of-network providers like a PPO. Rare these days.
HDHP (High Deductible Health Plan). A plan with a deductible above a federal threshold (around $1,600 individual in recent years). HDHPs come paired with HSAs, which is where the real benefit is.
HSA (Health Savings Account). A tax-advantaged savings account you can only open if you have an HDHP. Money goes in pre-tax, grows tax-free, comes out tax-free for qualifying medical expenses. It is, honestly, one of the best tax-advantaged accounts available in the U.S. tax code, and if you’re young and healthy and have an HDHP, maxing the HSA out is a financial cheat code. Another tick in the HDHP-might-be-fine column if you’re not a heavy healthcare user.
The terms that don’t matter, and the terms designed to look like they do
Two categories worth grouping together because they’re both noise, just different flavors of noise. The first batch describes how the system runs in the background. You can safely ignore them as a patient. ACO (Accountable Care Organization) is a group of providers that get paid based on outcomes and cost containment for a population of patients. Capitation is a payment model where the insurance pays the provider a flat monthly amount per patient regardless of visit count. Fee-for-service is the opposite, provider gets paid per visit. MIPS is a Medicare quality reporting program. All four of these affect what your clinic does behind the scenes and change nothing about your visit, so you can let them slide past you.
The second batch is marketing dressed up as benefits. Watch for these because they sound like value and often aren’t.
This is the marketing layer. Watch for these because they sound like benefits and often aren’t.
“Preferred provider” without specified better rates. Some plans label certain in-network providers as “preferred” with vague promises of better service or shorter waits. If there’s no specific dollar savings attached, the label is decorative. Ignore it.
“Wellness benefit” as a category. Often this turns out to be a discount on a gym membership, a free pedometer, or an app subscription, not actual medical coverage. The wellness category exists mostly so the plan can advertise it. Real benefits are in the medical and prescription sections.
“100% covered preventive care.” True for a specific list of preventive services defined by the ACA, things like annual physicals, certain screenings, vaccinations. Not true for anything diagnostic. If your doctor finds something at the annual visit and orders a follow-up test, that follow-up isn’t preventive anymore and isn’t free anymore. This catches people every year.
“Covered” by itself. Always ask: covered before or after deductible, with or without prior auth, in-network or out-of-network, at what coinsurance rate. “Covered” without those modifiers is marketing.
“Free 24/7 nurse line.” Usually exists, usually fine, occasionally useful, never a substitute for actual care. Listed as a benefit to fill space.
The list you actually need to memorize
If you only retain six terms from this whole piece, retain these. Everything else you can look up when it comes up. These six come up constantly.
- Deductible. What you pay first.
- Out-of-pocket maximum. The ceiling. The most important number.
- In-network vs. out-of-network. Where you can go and what it costs.
- Formulary. Whether your medication is on the list.
- Prior authorization. Whether your provider has to file paperwork before treatment.
- EOB. Not a bill. The actual bill comes later, from the provider.
That’s the working set. The rest of the vocabulary in your plan documents is either rare, regulatory, or marketing, and you can deal with it when and if it shows up. The point of knowing the working set is that when an insurance person says “your medication isn’t on the formulary so we need a prior auth before we can cover it at out-of-network rates after you meet your deductible,” you can translate that in real time instead of nodding and hoping. Consider this the translation key.
