Every open enrollment, someone is handed a form full of words they're expected to already know, asked to pick between three plans in the next ten minutes, and told to call HR if they have questions. HR usually didn't write the plan either. Here's what the words actually mean, in the order you'll hit them.
Premium
What it costs to have the plan at all, paid whether or not anyone uses it. Usually split between what your employer pays and what comes out of your paycheck. This is the number on the enrollment form. It is not the number that determines how expensive the plan actually is to use — that's everything below.
Deductible
What you pay out of your own pocket for covered care before the plan starts paying its share. A $2,000 deductible means the first $2,000 of most covered services in a plan year comes from you. Preventive care (an annual physical, for instance) is typically exempt from this and covered before the deductible, but check the plan document rather than assuming.
Coinsurance
Once you've met your deductible, this is the percentage split between you and the plan on covered costs. "80/20 coinsurance" means the plan pays 80% and you pay the remaining 20%, until you hit your out-of-pocket maximum.
Copay
A flat fee for a specific type of visit — $30 for a primary care visit, $60 for a specialist — instead of a percentage. Copays and coinsurance can exist on the same plan for different services, which is a common source of confusion when comparing two plan documents side by side.
Out-of-Pocket Maximum
The absolute ceiling on what you'll pay in a plan year for covered care, combining deductible, coinsurance, and copays. Once you hit it, the plan covers 100% of covered costs for the rest of the year. This is the number that matters most in a genuinely bad year, and the one most people never look at until they need it.
Network (In-Network vs. Out-of-Network)
The list of doctors, hospitals, and facilities that have a negotiated rate with your plan. In-network care uses that negotiated rate and counts toward your deductible and out-of-pocket maximum at the lower cost. Out-of-network care may not be covered at all, or may be covered at a much lower percentage with a separate, higher out-of-pocket maximum. Always confirm network status before a planned procedure, not after the bill arrives.
HSA (Health Savings Account)
A tax-advantaged account available only when paired with a qualifying high-deductible health plan. Money goes in pre-tax, grows tax-free, and comes out tax-free for qualified medical expenses. Unlike an FSA, unused funds roll over every year and the account stays with you if you change jobs.
FSA (Flexible Spending Account)
Similar tax treatment to an HSA, but available regardless of plan type, and generally subject to "use it or lose it" rules at the end of the plan year (some plans allow a small rollover or grace period — check yours). Funds are typically owned by the employer's plan, not portable if you leave the job, unlike an HSA.
Evidence of Coverage / Summary Plan Description
The actual legal document describing what your plan covers, in far more detail than the one-page comparison chart handed out at enrollment. If a claim gets denied and the reasoning doesn't make sense, this is the document to request and read, not the marketing summary.
None of these words are complicated on their own. They're only confusing because nobody sits down and goes through them before asking you to choose.
That sit-down conversation is, in our view, not an optional add-on to running a benefits program. It's the actual point of having one. If your team has never had it, that's worth fixing before the next enrollment window, not during it.