If you delay Medicare Part D because you have drug coverage from a job, a retiree plan or another source, that coverage must be "creditable" to protect you from the Part D late penalty. This guide explains what counts, how to check yours, and how to use the 2-month window to join a plan when the coverage ends.
What "creditable" means
Medicare defines creditable drug coverage as coverage that is expected to pay, on average, at least as much as Medicare's standard Part D coverage. Medicare.gov lists sources that may be creditable:
- A current or former employer or union plan
- TRICARE or the Department of Veterans Affairs (VA)
- The Indian Health Service (IHS)
Not creditable:
- Drug discount cards and manufacturer coupons
- Paying cash at the pharmacy
- Any plan whose notice says its coverage is not creditable
The yearly creditable coverage notice
Employers, unions and other plan sponsors must tell people with Medicare, before October 15 each year, whether their drug coverage is creditable. They must also tell you when the status changes.
- Save every notice. When you join a Medicare drug plan, it may send you a letter asking about past coverage. Return it by the deadline, or you may be charged a penalty you don't owe.
- Read it every year. A plan that was creditable last year may not be this year.
- Ask if you don't get one. Request it from HR or the plan.
Which coverage is usually creditable?
| Coverage | Creditable? | Notes |
|---|---|---|
| Large-employer group plan | Usually | Confirm with the yearly notice |
| Small-employer group plan | Sometimes | Check the notice carefully |
| Retiree plans (including Oregon PEBB, OEBB and PERS Health) | Check the notice | PERS Health Insurance Program Medicare options include a Part D plan, so you don't need a separate one |
| TRICARE | Yes, per Medicare.gov | TRICARE For Life also requires Part A and Part B |
| VA drug coverage | Yes, per Medicare.gov | Only covers drugs from VA pharmacies and prescribers |
| Indian Health Service | Yes, per Medicare.gov | IHS and tribal care is not insurance; enrolling in Medicare helps your clinic bill Medicare; see tribal health and Medicare |
| COBRA | Depends | Creditable only if the plan's drug coverage is; doesn't extend the Part B window |
| Marketplace or individual plan | Depends | Ask the insurer for its creditable coverage status |
| Discount cards and coupons | No | Not insurance |
The 2-month window to join a plan
When you lose creditable drug coverage (or job-based coverage), you have 2 full months after the month the coverage ends to join a Part D plan or a Medicare Advantage plan with drug coverage, without a penalty.
Example: your job's drug coverage ends June 30. You have until August 31 to join, and the new plan can start the first of the month after it gets your request.
Don't mix up the two windows. Part B gives you 8 months after job coverage ends; Part D gives you 2. Many people miss the Part D deadline because they assume it matches Part B.
The Part D late penalty
If you go 63 days or more in a row without Part D or other creditable drug coverage after your Initial Enrollment Period ends, you may owe a late penalty when you join.
- Medicare takes 1% of the national base beneficiary premium ($41.33 in 2027) for each full month you were without coverage, and rounds it to the nearest 10 cents.
- The penalty is added to your monthly Part D premium for as long as you have Part D.
- Because the base premium changes every year, the dollar amount of your penalty changes too.
- People who get Extra Help don't pay the penalty.
Penalty example
Example: your Initial Enrollment Period ended in October 2025. You had no creditable drug coverage and joined a Part D plan during Open Enrollment for coverage starting January 1, 2027.
- Months without coverage: November 2025 through December 2026, 14 months.
- Penalty: 14% of $41.33, about $5.79, rounded to the nearest 10 cents, each month in 2027.
- It is recalculated each year from the new base premium and continues for as long as you have Part D.
If you think the penalty is wrong, for example because you had creditable coverage, you can ask for a reconsideration. Follow the instructions in the letter from your plan, and act quickly: Medicare generally gives you 60 days from the date of the letter.
How to check your coverage
- Find your creditable coverage notice. It comes with your fall benefits materials or separately.
- Read the wording. It will say whether your coverage is creditable or not creditable.
- Ask if you can't find it. Your employer or plan must give it to you.
- Keep every year's notice. They are your proof if a penalty is ever charged.
- Check again when anything changes. A new plan, a merger or a benefit change can change the status.
Oregon notes
- PEBB and OEBB: retiree medical coverage ends when you become eligible for Medicare (OAR 101-050-0010; OAR 111-050-0015), so plan your Part D or Medicare Advantage enrollment for the month Medicare starts. See PEBB and OEBB.
- PERS retirees: the PERS Health Insurance Program's Medicare options include a Part D prescription drug plan. Don't buy a separate Part D plan on top of it.
- Veterans: VA drug coverage is creditable, but it covers only drugs from VA providers and pharmacies. See veterans and Medicare in Oregon.
- OHP members: OHA says most OHP members with Medicare get their drugs through Medicare Part D and get Extra Help automatically. See OHP and Medicare.
- Choosing a plan: for 2027, CMS data show 8 standalone Part D plans in Oregon from 4 companies. You can compare by ZIP code on PlanMatch or Medicare.gov, or you can request a call from a licensed insurance agent to review plans from the companies they work with.
Common mistakes
- Relying on discount cards. They aren't creditable; every month counts toward the penalty.
- Assuming any job plan is creditable. Check the notice every year.
- Missing the 2-month window. It is not 8 months like Part B.
- Throwing away notices. They are your evidence.
- Skipping Part D because you take no drugs now. The penalty can apply for life, so many people join a plan anyway.
Related guides
- Working past 65 in Oregon
- The Part B special enrollment period
- Medicare Part D in Oregon
- Extra Help in Oregon
Sources
- Medicare.gov — Creditable drug coverage
- CMS — Creditable coverage (disclosure to beneficiaries by October 15)
- Medicare.gov — Avoid late enrollment penalties (Part D penalty, reconsideration)
- Medicare.gov — Special Enrollment Periods (2 months after losing coverage)
- CMS — 2027 Part D national average bid and base beneficiary premium (July 28, 2026)
- Oregon PERS — About the PERS Health Insurance Program (Medicare plans include Part D)
- Or. Admin. Code § 101-050-0010, PEBB retiree coverage (via Cornell LII)
- Or. Admin. Code § 111-050-0015, OEBB early retiree coverage (via Cornell LII)
- Oregon Health Authority — OHP and Medicare
- CMS — Medicare Advantage and Part D Landscape files, contract year 2027 (plan counts)
Frequently asked questions
What does creditable mean for prescription drug coverage?
Medicare defines creditable drug coverage as coverage that is expected to pay, on average, at least as much as Medicare's standard Part D coverage. Plan sponsors test their coverage each year.
How do I know if my plan is creditable?
Your plan must tell you each year, before October 15, in a creditable coverage notice. Save every notice; a Medicare drug plan may ask about your past coverage when you join.
How long do I have to join a Part D plan after my coverage ends?
Two full months after the month your creditable coverage ends. This is much shorter than the 8-month Part B special enrollment period.
What is the Part D late-enrollment penalty in 2027?
1% of the national base beneficiary premium ($41.33 in 2027) for each full month you went without Part D or other creditable coverage after your first chance to enroll, rounded to the nearest 10 cents and added to your premium for as long as you have Part D.
Are GoodRx and other discount cards creditable?
No. Drug discount cards and manufacturer coupons are not insurance and don't count as creditable coverage, so months using only them count toward the penalty.
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