Medicare Costs People Forget to Check

A premium is like the menu price at a restaurant. The tip, the tax, the upcharge for substitutions, the dish you did not expect to order — those are what show up on the bill. Medicare works the same way.

Why the premium is misleading on its own

Plans with low premiums often shift cost to other places — higher deductibles, higher copays for specialists, narrower networks, prior authorization on more services, tighter drug formularies. Plans with higher premiums often have the opposite pattern. Neither structure is automatically better. What matters is which structure better fits the way you actually use care.

A plan that looks cheaper on the premium line can be more expensive in a year when you need a specialist, a surgery, an MRI, or a brand-name drug. A plan that looks more expensive on the premium can save money in the same year. The premium tells you what you pay whether you use care or not. The other numbers tell you what you pay when you do.

The costs people commonly forget

Part B deductible and the 20% coinsurance. On Original Medicare, after you meet the annual Part B deductible ($283 for 2026), Medicare typically pays 80% of approved charges and you pay 20% — with no annual out-of-pocket maximum unless you have a Medigap policy or other coverage that limits it (Medicare.gov — Part B Costs). For a routine year, that is unremarkable. For a year with surgery, hospitalization, or sustained outpatient care, that 20% with no cap is the single biggest cost variable on Original Medicare without a supplement.

Part A inpatient costs. Part A has its own deductible per benefit period ($1,736 for 2026), plus daily coinsurance amounts after day 60 of a hospital stay (Medicare.gov — Part A Costs). Most years, you do not touch it. The years you do, it matters.

Part D drug costs. The premium is one number. The deductible (up to $615 for 2026), the tier structure, the formulary, and the pharmacy network are four others. Two plans with similar premiums can produce very different annual costs depending on whether your drugs are on Tier 1 or Tier 4, and whether your pharmacy is preferred or standard.

Specialist and outpatient copays on Medicare Advantage. MA plan copays for a primary care visit and a specialist visit can differ substantially. So can copays for outpatient surgery, imaging, urgent care, and emergency room visits. The Summary of Benefits lists these. They are worth reading line by line, not skimmed.

Prior authorization and step therapy. These do not appear on a cost-comparison chart, but they affect cost indirectly. A required prior authorization can delay care. A step-therapy rule can require trying a cheaper drug first. Both can mean changes to the medications you actually receive, which can mean changes to what you actually pay.

Network rules. On an MA HMO, going out of network is usually not covered except in emergencies. On an MA PPO, out-of-network is allowed but at higher cost. On Original Medicare, any provider that accepts Medicare is in-network nationwide. The cost of going out depends entirely on what kind of plan you are on.

Supplemental benefit caps. MA plans often advertise dental, vision, hearing, OTC allowances, transportation, or flex cards. These usually carry annual caps. The headline number often refers to the maximum, not the typical. The fine print is in the Evidence of Coverage.

IRMAA — the income-based surcharge. Higher-income beneficiaries pay more for both Part B and Part D, based on income from two tax years prior (Medicare.gov). This is not on the plan brochure. It is a separate Medicare cost the plan has nothing to do with. People often discover it on their first Medicare bill.

Late enrollment penalties. Part B and Part D each have late enrollment penalties that can attach permanently to your monthly premium. Neither shows up on a typical cost comparison. Both can quietly add to your costs for the rest of your Medicare years.

How this applies to you

If you are comparing plans for the first time. Look beyond the premium column. Pull each plan's Summary of Benefits. Note the deductible, the specialist copay, the hospital copay, the drug deductible, and the out-of-pocket maximum (if any). Make a side-by-side. The cheapest premium is rarely the cheapest plan in a year when you actually use care.

If you are already enrolled. Once a month, glance at what you paid at the pharmacy and any EOBs or MSNs. Once a year — when the Annual Notice of Change arrives in September — read every cost line that changed. Plans can keep the same name and change the deductibles, copays, drug tiers, and supplemental caps for the next plan year.

If you are helping a parent. Ask to see the most recent Medicare Summary Notice or plan EOB. The actual costs paid over the last few months are more useful than the premium on the plan card. Together, you can see what is actually happening.

A short worked example

Two MA plans, same county, plan year 2026:

• Plan A: $0 premium, $0 primary care copay, $45 specialist copay, $395 hospital copay per day for the first 6 days, $5,500 annual out-of-pocket maximum
• Plan B: $35 premium, $0 primary care copay, $25 specialist copay, $295 hospital copay per day for the first 5 days, $4,200 annual out-of-pocket maximum

For a healthy year with two primary care visits and one specialist visit, Plan A is cheaper by about $420. For a year with two specialist visits a month and a five-day hospital stay, Plan B is cheaper by about $1,400. Same county. Same person. Different plan year. The numbers are illustrative — actual plan costs vary by carrier, county, and year. The pattern is the point.

A short pre-enrollment checklist

Before you choose or renew a plan, look at: premium, annual deductible (medical and drug, if separate), primary care copay, specialist copay, outpatient surgery and imaging cost, hospital cost per day, emergency room copay, drug tier placement for every drug you take regularly, preferred pharmacy network, out-of-pocket maximum (where it applies), supplemental benefit caps, and IRMAA bracket if your income is above the threshold.

This is more numbers than most people want to look at. It is also fewer numbers than your annual cost-of-care depends on.

What this is not

It is not a recommendation to optimize every dollar. Some people prefer slightly higher premiums for slightly more predictability, and that is a legitimate trade-off. The point of looking at every cost is to make the trade-off knowingly, not to chase the lowest number.

It is not a substitute for SHIP counseling, a licensed agent, or the official Plan Finder at Medicare.gov. Those tools and people can model your specific situation. This article is the lens to bring to them.

The premium is the menu price. The bill is the bill. Both deserve a look.

The Clearing does not sell insurance, recommend specific plans, or earn commissions. When you are ready to decide, verify the details on Medicare.gov or with a SHIP counselor in your state.