How to Check Your Own Doctors and Prescriptions Before You Enroll

Build the list first

For prescriptions, you need the exact name, the dose, and how often you take it. A 20 mg tablet and a 40 mg tablet are separate entries on a formulary and can sit on different tiers. Your pharmacy can print a twelve-month history if you'd rather not go through the cabinet.

For providers, list everyone you actually want to keep: primary care, each specialist, your preferred hospital, and any imaging or lab you use regularly. Include the practice name as well as the doctor's — a physician can be in network at one location and not another.

Checking drugs: use the plan year, not today

Every plan publishes a formulary — its list of covered drugs and what tier each sits on. You can search it on the plan's own website, or enter all your drugs at once in [Medicare's Plan Finder](https://www.medicare.gov/plan-compare), which prices your actual list against every plan in your ZIP code.

Check the formulary for the year the coverage starts, not the current one. Plans republish formularies each fall for January, and a drug that's on tier 2 this year can be on tier 3 next year. Also look for the words *prior authorization*, *step therapy*, and *quantity limit* next to your drugs — those don't mean the drug isn't covered, but they mean an extra hoop.

For context on what you're capped at: Part D out-of-pocket drug costs are limited to $2,100 in 2026, and the national base Part D premium is $38.99 a month. See our guide to Part D formulary tiers for how the tiers themselves work.

Checking doctors: don't trust the directory alone

Start with the plan's online provider directory, searching by the doctor's name and your ZIP code. Then — and this is the step that catches the errors — call the doctor's billing office and ask, in these words: "Are you in network for [exact plan name] for 2026?" Not "do you take Medicare," and not the insurance company's name. The plan name.

Provider directories are known to carry stale entries, and the practice's billing office knows what it has actually contracted for. Two phone calls now beats a surprise bill in March. For Marketplace plans the same logic applies — see checking a doctor's network on an ACA plan.

What to do when nothing fits

Sometimes the plan with your drugs doesn't have your doctor, and the plan with your doctor prices a drug badly. That's a real trade-off, not a mistake — and it's the point where a second opinion earns its keep, because comparing that trade-off across a dozen plans is exactly the slow mechanical work an agent does all day.

You can also ask your prescriber whether a therapeutic alternative on a lower tier would work for you. That is a medical question for them, not an insurance question for us or for anyone selling you a plan.