Medicare Part D is not mandatory, but skipping it can cost you money later

You do not have to sign up for Medicare Part D (prescription drug coverage) when you first become may be able to access at 65. However, if you go without it and later decide you want it, Medicare charges you a late enrollment penalty — a permanent increase to your monthly premium that lasts as long as you have Part D coverage.

The penalty is small each month, but it adds up over years. Whether you should skip Part D depends on your actual prescription costs right now, not on guessing what you might need later. If you take no medications or only cheap ones you pay cash for, you may come out ahead by waiting. If you take even one brand-name drug, the math usually favors signing up now.

Key Takeaways

  • You can decline Part D when you turn 65, but Medicare will charge you a late enrollment penalty if you join later, calculated as 1% of the national average Part D premium for each month you were without coverage.
  • The penalty stays on your premium for as long as you have Part D, so a two-year delay costs you money for years.
  • If you have coverage through an employer or union, you may be protected from the penalty — ask your benefits office whether your plan counts as "creditable coverage."
  • You can join Part D during the annual enrollment period (October 15 to December 7) without penalty only if you never had coverage, or if you had a may have access to life event like losing employer coverage.
  • The decision should be based on what you actually spend on prescriptions now, not on what you might need someday.

How the late enrollment penalty works

If you do not sign up for Part D when you first become may be able to access, and you later join, Medicare calculates your penalty based on how many months passed without coverage. The penalty is 1% of the national average Part D monthly premium for each month you were uninsured. That national average changes each year — it was around $34 in 2024, though it varies by region and plan.

The penalty is added to your monthly premium permanently. If you waited two years (24 months) before joining, you would pay roughly 24% more than someone who signed up on time. That extra cost does not go away when you switch plans or when the national average changes — it stays locked in as long as you have Part D coverage.

There is one exception: if you have creditable coverage through an employer, union, or veteran's benefits, you do not owe a penalty when you eventually join Part D. Creditable coverage means the plan covers prescription drugs at least as well as Medicare Part D does. Ask your employer's benefits office directly whether your plan qualifies — do not guess.

When you can join Part D without a penalty

You can join Part D during the Initial Enrollment Period (the seven months around your 65th birthday) without any penalty, whether or not you have other coverage. You can also join during the Annual Enrollment Period, which runs from October 15 to December 7 each year, but only if you meet certain conditions.

Outside these windows, you can join Part D without a penalty only if you had a may have access to life event — losing employer coverage, moving to a new state, or becoming newly may be able to access for Medicare. If you lost employer coverage, you have 63 days from the date coverage ended to join Part D penalty-free. After 63 days, the late enrollment penalty applies.

If you miss the important date and do not have a may have access to event, you are stuck with the penalty unless you can prove you had creditable coverage the whole time. That is why it matters to keep records of any employer or union drug coverage you had.

The case for skipping Part D now

If you take no prescription medications, or only inexpensive drugs you can afford to pay out of pocket, you may save money by not enrolling. Part D plans have monthly premiums (usually $5 to $15, sometimes more), annual deductibles, and copays. If your actual drug costs are lower than what you would pay in premiums and out-of-pocket costs combined, you come out ahead by waiting.

The math changes the moment you need even one expensive medication. A single brand-name drug can cost hundreds of dollars per month without insurance. Part D coverage, even with a deductible and copays, usually costs far less than paying the full price. Once you factor in the late enrollment penalty, the savings from skipping Part D disappear quickly.

If you are on the fence, call your pharmacy and ask what your actual out-of-pocket costs would be for the medications you take now. Compare that to the premium and deductible of a Part D plan in your area. Medicare's Plan Finder tool (on Medicare.gov) lets you enter your medications and see what different plans would cost you. That real number is more useful than any general rule.

The case for signing up now

Even if you do not take medications today, your situation can change fast. A diagnosis, an accident, or a new medication from your doctor can happen at any time. If you wait until then to join Part D, you will owe the late enrollment penalty on top of your premium for years to come.

The penalty is permanent and compounds. A two-year delay costs you roughly 24% more per month for the rest of your life on Medicare. Over ten years, that adds up to thousands of dollars. The only way to avoid it is to join during your Initial Enrollment Period or to have creditable coverage the whole time.

Many people sign up for Part D even if they do not use it much, straightforward to protect themselves against future costs and to avoid the penalty. The monthly premium is usually modest — often less than $10 — and the peace of mind is worth it to them. If you are unsure, signing up costs less than the penalty would if you change your mind later.

What happens if you have other drug coverage

If you have prescription drug coverage through an employer, a union, or the Veterans Health Administration, you may not need Part D right away. The key question is whether that coverage is creditable — meaning it covers drugs at least as well as Part D does. If it is creditable, you can skip Part D without owing a penalty later.

The problem is that creditable coverage often ends. You might retire, your employer might drop the benefit, or you might lose may be able to access. When that happens, you have 63 days to join Part D without a penalty. If you miss that window, the penalty applies. Many people do not realize this important date exists until it is too late.

Before you skip Part D, get written confirmation from your benefits office that your coverage is creditable and ask them to notify you if that status changes. Keep that letter. If your coverage ends, mark your calendar for 63 days out and contact Medicare to join Part D. Do not wait.

How to make the decision

Start by listing every prescription medication you take right now, including the dose and how often you refill it. Call your pharmacy or use a pharmacy website to find out what you would pay out of pocket for each one without insurance. Add up those costs for a year.

Then go to Medicare.gov and use the Plan Finder tool. Enter your medications and your zip code. The tool will show you Part D plans available in your area and what each one would cost you — premiums, deductibles, and copays combined. Compare that total to what you would pay without insurance.

If the Part D plan costs less, sign up. If paying out of pocket costs less, you can skip Part D for now — but only if you are certain your medications will not change and you have a plan to join during the next Annual Enrollment Period or if your situation changes. Do not skip it and hope you remember to sign up later. The penalty is straightforward to trigger and hard to escape.

Frequently Asked Questions

What is the late enrollment penalty amount in 2024?

The penalty is 1% of the national average Part D premium for each month you were without coverage. The national average was around $34 per month in 2024, so the penalty is roughly $0.34 per month for each month of delay. That amount changes yearly, and your actual penalty depends on when you join and what the average was during the months you were uninsured.

Can I join Part D anytime, or only during certain months?

You can join during your Initial Enrollment Period (seven months around your 65th birthday) anytime without penalty. After that, you can only join during the Annual Enrollment Period (October 15 to December 7) or if you have a may have access to life event like losing employer coverage. Outside these windows, you owe a late enrollment penalty.

Does the penalty ever go away?

No. The late enrollment penalty stays on your premium as long as you have Part D coverage. It does not expire, and it does not decrease over time. If you delay joining by two years, you pay the penalty forever — even if you switch to a different Part D plan or move to a different state.

What counts as creditable coverage?

Creditable coverage is prescription drug insurance through an employer, union, or the VA that covers drugs at least as well as Medicare Part D does. Your benefits office should be able to tell you in writing whether your plan qualifies. Do not assume — ask them directly and keep the answer in writing.

What if I cannot afford a Part D premium?

You may be able to get help paying Part D premiums through the Low-Income Subsidy program if your income and resources are below certain limits. Contact your local Social Security office or call 1-800-MEDICARE to learn whether you may have access to. This program can reduce or eliminate your premium and lower your copays.