15 Medicare Terms You Need To Know Before You Enroll
If Medicare feels confusing, you’re not alone.
Most people turning 65 (or helping a loved one) run into the same problem: the language. Words like copay, deductible, and formulary get thrown around like everyone already understands them- but no one actually explains them in plain English.
This cheat sheet breaks down the 15 most important Medicare terms so you can feel more confident before choosing a plan.
PREMIUM
This is the amount you pay every month just to have your plan.
Think of it like a membership fee- whether you use the plan a lot or a little, you still pay this.
DEDUCTIBLE
This is what you pay out of pocket before your insurance starts helping,
Example: If your deductible is $500, you pay the first $500 of covered services yourself before your plan kicks in. However, the deductible doesn’t apply to some services.
COPAY
A flat fee you pay when you get care.
Example:
$20 for a doctor visit
$50 for a specialist
COINSURANCE
Instead of a flat fee, this is a percentage you pay.
Example:
You pay 20% of the cost
Insurance pays 80%
OUT-OF-POCKET MAXIMUM
This is the most you can spend in a year on covered services.
Once you hit this number, your plan pays 100% for covered care for the rest of the year.
NETWORK
This is the group of doctors, hospitals, and providers your plan works with.
In-network = lower costs
Out-of-Network = higher cost or not covered (depending on plan type)
HMO (HEALTH MAINTENANCE ORGANIZATION)
A type of Medicare Advantage plan.
Usually:
Requires you to stay in-network
May require referrals to see specialists
Lower monthly costs in many cases
PPO (PREFERRED PROVIDER ORGANIZATION)
Another Medicare Advantage option.
Usually:
More flexibility with doctors
You can go out-of-network (at a higher cost)
Typically, higher premiums or costs than HMO
MEDICARE ADVANTAGE (PART C)
A bundled plan that replaces Original Medicare coverage.
It usually includes:
Part A (hospital)
Part B (medical)
Often Part D (prescriptions)
Sometimes extras like dental or vision
ORIGINAL MEDICARE
This is government-run Medicare:
Part A - hospital coverage
Part B - medical coverage
It does NOT include most prescription drug coverage, or extras like dental or vision.
PART D
This is prescription drug coverage.
It helps pay for medications and can be:
Standalone (with Original Medicare)
Included in many Medicare Advantage plans
FORMULARY
A fancy word for a drug list.
It tells you:
Which medications your plan covers
What tier (cost level) they fall into
TIER
The pricing level of your medications.
Example:
Tier 1 = cheapest generic drugs
Higher tiers = more expensive brand-name or specialty drugs
PRIOR AUTHORIZATION
This means your insurance has to approve a service or medication before they will cover it.
It’s basically a “permission check” from the plan.
OUT-OF-NETWORK
Doctors or providers not contracted with your plan.
Depending on your plan type:
You may pay more
Or it may not be covered at all
What this all really means:
You don’t need to memorize everything - you just need to understand how these pieces affect your costs, doctors, prescriptions.
Most Medicare decisions come down to three things:
What you pay monthly
What you pay when you use care
Whether your doctors and medications are covered
Final Note
If this still feels overwhelming, that’s normal.
Medicare isn’t hard because it’s complicated - it’s hard because it’s new language. Once you understand the terms, the decisions become a lot clearer.
If you want help reviewing your options or making sure your doctors and prescriptions are covered, I can walk you through it step by step.