Part D is not mandatory, but you may face a penalty if you delay

Part D (prescription drug coverage) is optional — you do not have to enroll when you first become may be able to access at 65. However, if you go without Part D coverage for more than 63 days after you become may be able to access, Medicare will charge you a late enrollment penalty for as long as you have Part D. The penalty amount changes each year and is added to your monthly premium. The only way to avoid the penalty is to have had other creditable drug coverage (from an employer, union, or VA) during the gap.

Whether you should take Part D depends on whether you actually take prescription medications. If you take no regular medications and do not expect to need them, you can skip Part D without penalty — as long as you do not go more than 63 days without coverage. If you take even one medication regularly, the penalty usually costs more over time than the premium itself, so most people come out ahead by enrolling.

Key Takeaways

  • You can refuse Part D when you turn 65, but if you go without coverage for more than 63 days, Medicare adds a permanent penalty to your monthly premium.
  • The late enrollment penalty is roughly 1 percent of the national average Part D premium for each month you were without coverage, and it stays with you for life.
  • You do not owe a penalty if you had creditable drug coverage from an employer, retiree plan, union, or the VA during the time you were not in Part D.
  • You can enroll in Part D during the annual enrollment period (October 15 to December 7) or during your initial enrollment period if you are newly may be able to access.
  • If you take no medications and want to avoid the premium cost, you must keep proof that you had other coverage or enroll within 63 days of losing it.

How the late enrollment penalty works

The penalty is calculated as approximately 1 percent of the national average Part D premium for each full month you were without creditable coverage. In 2024, the national average Part D premium is around $34, so the penalty is roughly $0.34 per month for each month you were without coverage. That amount is rounded to the nearest dollar and added to your monthly premium permanently.

For example, if you go without Part D for 12 months, your penalty would be roughly $4 per month for life. If you go without it for 36 months, your penalty would be roughly $12 per month for life. The penalty does not expire — it stays on your account as long as you have Part D coverage. This is why the 63-day window matters: staying within it costs you nothing, but crossing it locks in a permanent cost.

The exact penalty amount is recalculated each year based on that year's national average premium, so your penalty may increase slightly year to year. Medicare sends you a notice each year showing your penalty amount if you have one.

What counts as creditable coverage during the gap

Creditable coverage means drug coverage that is at least as good as Part D. If you had this kind of coverage while you were not in Part D, you do not owe a penalty, even if you go without Part D for years. The most common sources of creditable coverage are an employer or retiree health plan, a union plan, TRICARE (military coverage), the VA, or Indian Health Service.

Your former employer or plan administrator must send you a notice each year stating whether your coverage was creditable. Keep these notices — you will need them to prove you do not owe a penalty when you enroll in Part D. If you cannot find the notice, you can contact your former employer's benefits office or call the plan directly and ask them to send you a letter confirming the dates your coverage was creditable.

Medicaid alone does not count as creditable coverage for Part D purposes. Neither does a discount card or a program that gives you a percentage off medications. The coverage must be actual insurance that pays for drugs, not just a discount.

When you can enroll in Part D without a penalty

You have a seven-month initial enrollment period centered on the month you turn 65. It starts three months before your 65th birthday and ends three months after. During this window, you can enroll in Part D without penalty, even if you have no other coverage. If you miss this window and do not have creditable coverage, the penalty clock starts.

After your initial enrollment period ends, you can only enroll during the annual enrollment period, which runs from October 15 to December 7 each year. Coverage begins January 1. If you enroll outside these windows and do not have a may have access to life event (such as losing employer coverage), you will have to wait until the next annual enrollment period.

If you lose creditable coverage, you have a 63-day special enrollment period to join Part D without penalty. The clock starts the day your coverage ends. You must enroll within 63 days to avoid the penalty. After 63 days, the penalty applies to any future Part D enrollment.

Deciding whether to enroll if you take no medications

If you genuinely take no regular medications and have no chronic conditions, you can skip Part D. The risk is that if you later need medications, you will owe the penalty. The decision comes down to whether you think you might need drugs in the future and whether the potential penalty is worth avoiding the premium now.

A middle-ground option is to enroll in a low-cost Part D plan just to avoid the penalty. Some plans have premiums under $10 per month, which over several years may cost less than the penalty you would owe if you later need drugs. You can switch plans every year during the annual enrollment period, so you can always move to a cheaper plan if your medication needs change.

If you are certain you will never need prescription drugs, document that decision and keep proof of any creditable coverage you had. If circumstances change and you do need medications later, you will have the documentation to show Medicare.

How to enroll in Part D

You can enroll through Medicare.gov, by phone at 1-800-MEDICARE, or in person at a local Social Security office. You will need your Medicare card and information about any medications you currently take. The plan will ask you which drugs you use so it can show you which plans cover them and at what cost.

When you enroll, you choose a specific Part D plan offered by a private insurance company. Different plans cover different drugs and charge different premiums and copays. You can use the Medicare Plan Finder tool on Medicare.gov to compare plans based on your medications and preferred pharmacies. The tool shows you the estimated out-of-pocket cost for each plan so you can pick the cheapest one for your situation.

Enrollment takes about 15 minutes online or by phone. Coverage typically begins on the first day of the month after you enroll, though if you enroll between the 1st and 15th of a month, coverage may start that same month.

What happens if you enroll late and owe a penalty

If you enroll in Part D after your initial enrollment period and after losing creditable coverage, Medicare will calculate your penalty based on how many months you were without coverage. You will see the penalty amount on your enrollment confirmation and on your Medicare bill each month. You cannot appeal the penalty or have it waived unless you can prove you had creditable coverage during the gap.

If you believe you had creditable coverage but did not report it, you can submit proof to Medicare and request a recalculation. Contact Medicare at 1-800-MEDICARE with your documentation (letters from your former employer or plan confirming the dates and type of coverage). Medicare will review your case and adjust your penalty if the proof is valid.

Frequently Asked Questions

Can I drop Part D and pick it back up later without a penalty?

No. Once you enroll in Part D, if you drop it and go without coverage for more than 63 days, you will owe a penalty when you re-enroll. The only exception is if you have creditable coverage from another source during the gap. If you want to switch plans, do so during the annual enrollment period — that is not considered dropping coverage.

What if I am still working at 65 and have employer drug coverage?

You do not have to enroll in Part D while you have employer coverage, as long as that coverage is creditable. When you retire and lose the employer plan, you have 63 days to enroll in Part D without penalty. Make sure your employer sends you a creditable coverage notice so you can prove you had coverage during the gap.

Does Medicare Part B have a late enrollment penalty like Part D does?

Yes, Part B (medical insurance) also has a late enrollment penalty if you delay past your initial enrollment period. Part D and Part B penalties are separate and calculated differently. Both explore if you miss both enrollment windows.

Can I see what my penalty will be before I enroll?

Medicare does not calculate your penalty in advance. You can estimate it using the formula (roughly 1 percent of the national average premium per month without coverage), but the exact amount depends on the year you enroll and the national average premium that year. Medicare will tell you the exact penalty amount when you enroll or when you call to ask.

If I have Medicaid, do I still need Part D?

Medicaid does not count as creditable drug coverage for Part D purposes, so if you have only Medicaid, you should enroll in Part D to avoid the penalty. However, some state Medicaid programs do cover drugs, so check with your state Medicaid office about what they cover. You can have both Medicaid and Part D at the same time.