Why this deserves its own checklist
Enrollments fail quietly. The application goes in, a confirmation screen appears, and something downstream never completes — a first premium that was never billed, a Medicare handshake that didn't clear, a form that needed a signature nobody chased. Nothing tells you. You find out at a pharmacy counter in January.
People who enroll through an agent are partly protected by the agent noticing. If you did it yourself, spend ten minutes doing the noticing.
Check 1: your own account
Create a free account at [medicare.gov](https://www.medicare.gov) if you don't have one. It shows what Medicare has on file for you — Part A and Part B effective dates, and which Medicare Advantage or Part D plan you're recorded as being in. This is the authoritative record, not the plan's letter.
For Marketplace coverage, log in at healthcare.gov and open the application for the coverage year. It shows the plan you selected and its status. A status of "enrolled" from the Marketplace still doesn't mean the insurer has been paid — that's check 3.
Check 2: call the plan and ask a specific question
Call the member services number on your card or letter and ask precisely this: "Am I active as of [date], and has my first premium been received?" Vague questions get vague answers. Ask for the effective date they have on file and compare it to what you expected.
Write down the date, who you spoke with, and any reference number. If a dispute comes later, that note matters.
Check 3: the first premium
This is the most common silent failure, especially on Marketplace plans. Selecting a plan does not start coverage — the first premium payment does, and the insurer sets a deadline that often falls before the coverage start date.
If no bill has arrived within about two weeks of enrolling, do not assume you owe nothing. Call the insurer and ask how to pay. People lose January coverage every single year because a bill went to spam, went to an old address, or simply never went out.
Check 4: use it, deliberately, early
The most convincing test is a real transaction. Fill one prescription in the first days of coverage and see whether the pharmacy processes it at the price you expected. Or book a routine appointment and let the office verify your eligibility while you're standing there.
If either comes back wrong, you've found the problem with weeks to fix it rather than discovering it during something urgent.
If it didn't go through
Call the plan first — many failures are administrative and get fixed on the call. If the plan can't help, call 1-800-MEDICARE (1-800-633-4227, TTY 1-877-486-2048), which is staffed 24 hours a day, or the Marketplace at 1-800-318-2596 for ACA coverage.
If you have evidence you enrolled on time and the failure was not yours, ask specifically about reinstatement or an equitable relief request. This is also a fair moment to bring in help — your State Health Insurance Assistance Program does exactly this for free, and a call with us costs nothing either.
Frequently Asked Questions
How can I check whether I'm actually enrolled in Medicare?
Log in to your account at medicare.gov. It shows your Part A and Part B effective dates and which Medicare Advantage or Part D plan you're recorded in — that's the authoritative record.
I enrolled in a Marketplace plan but got no bill. What now?
Call the insurance company and ask how to pay the first premium. Coverage does not start until that payment is received, and a missing bill does not remove the deadline.
What if I find out my enrollment never went through?
Call the plan first, since many failures are administrative. If that fails, call 1-800-MEDICARE or the Marketplace at 1-800-318-2596, and ask about reinstatement or equitable relief if you enrolled on time.
How soon should I check?
Within two weeks of enrolling, and again in the first days of coverage. Filling one prescription early is the most convincing test there is.
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