GetFastRates.com

Medicare Late Enrollment Penalty Avoidance Checklist

A timing-focused checklist for confirming your Medicare Part B and Part D enrollment dates before a gap turns into a lifetime penalty.

Medicare4 min readReviewed 2026-09-22

Call 855-367-1095 Make an appointment

Short answer

Avoiding a Medicare late-enrollment penalty starts with knowing your exact Initial Enrollment Period dates, confirming whether any coverage you had during a gap was truly creditable, and enrolling before your window closes -- or documenting the exception if one applies.

Use this before you call.

Not sure if a penalty applies to you? Call GetFastRates.com before you enroll or dispute anything.

Confirm your exact Initial Enrollment Period start and end dates.

List every source of coverage you had during any gap, and its exact dates.

Check whether that coverage was creditable for Part B and separately for Part D.

If a gap exists, estimate the potential penalty before assuming it doesn't apply.

Call for help confirming an exception or filing a reconsideration if one may apply.

Part B and Part D penalties are calculated separately

A gap in medical coverage and a gap in drug coverage are evaluated independently, using different formulas -- it's possible to owe one penalty, both, or neither, depending on your specific coverage history for each.

Creditable coverage is the detail worth double-checking

Not every type of coverage counts as creditable for avoiding these penalties -- confirming this in writing, rather than assuming, is the single most common way to catch a mistake before it becomes a lifetime cost.

Active employer group coverage (generally 20+ employees) is the most common qualifying exception for Part B
COBRA and retiree coverage generally don't count as creditable for this purpose

Common questions about this topic

How do I know if I already have a penalty?

Your Medicare premium statement will show it as an added amount -- comparing your current premium to the standard published premium for the year is a quick way to check.

Can a penalty be corrected after the fact?

In specific, documented situations -- like proving qualifying employer coverage existed during the gap -- a penalty can potentially be reconsidered. It generally requires documentation, not just a request.

Tools that can help

Medicare Enrollment Period CalculatorFind your Medicare enrollment window and what it means for your timing.Medicare Part B Late Enrollment Penalty CalculatorEstimate whether a Part B late enrollment penalty could apply to you.Medicare Plan Ending FinderCheck your carrier and ZIP code against current, verified plan-ending records.

Trusted public sources

These links are provided for general public information. They do not replace a personal coverage review.

Call now or request a callback.

Calling is fastest. If you cannot call right now, send a request and keep your coverage questions handy for the callback.

GetFastRates.com is free to use. There is no cost to call 855-367-1095, request help, or speak with a licensed insurance agent through this service. "Free" describes GetFastRates' help -- not the price of insurance, coverage, premiums, or a plan.