Creditable prescription drug coverage allows you to delay Part D enrollment without penalty. If you lose creditable coverage, you have only 2 months to enroll in Part D before penalties begin accruing at 1% of the national base premium per month - permanently. FEHB, TRICARE, VA, and large employer plans are typically creditable; COBRA and marketplace plans usually are not.
What "Creditable Coverage" Means for Part D
If your prescription drug coverage from an employer, union, TRICARE, VA, or other source is at least as good as standard Medicare Part D coverage, it's considered "creditable coverage." Having creditable coverage allows you to delay Part D enrollment without facing the late enrollment penalty.
Your prescription drug plan must mail you a "Notice of Creditable Coverage" every year, typically in September before the October 15 Annual Enrollment Period. This notice tells you whether your coverage is creditable.
Keep these notices! If you ever need to prove you had creditable coverage to avoid the Part D penalty, you'll need them. File them in your Medicare records.
The Part D Late Enrollment Penalty
If you go 63 or more consecutive days without creditable prescription drug coverage after your Initial Enrollment Period, you'll face a permanent Part D late enrollment penalty when you eventually enroll.
How the penalty is calculated:
- 1% of the "national base beneficiary premium" for each month without creditable coverage
- 2026 national base premium: approximately $38.99/month
- So each month without coverage adds about $0.39/month to your Part D premium - permanently
Example: If you went 36 months (3 years) without creditable coverage, your Part D premium would be 36% higher - approximately $14.04/month extra - for the rest of your life.
The 2-Month Part D SEP After Losing Creditable Coverage
When you lose creditable prescription drug coverage (job ends, plan loses creditable status, etc.), you get a 2-month Special Enrollment Period to join a Medicare Part D plan or Medicare Advantage plan with drug coverage.
The 2-month clock starts:
- The month after you lose creditable coverage, OR
- The month after you receive notice that coverage is ending
- Whichever is LATER
If you don't enroll in Part D during this 2-month window, you'll need to wait until the next Annual Enrollment Period (October 15 - December 7) and you'll start accumulating Part D penalty months.
Common Creditable Coverage Sources
FEHB (Federal Employees Health Benefits)
FEHB prescription coverage is virtually always creditable. Federal retirees with FEHB can delay Part D indefinitely without penalty. The FEHB Open Season notice each year confirms this.
TRICARE
TRICARE prescription coverage is creditable, including TRICARE For Life for Medicare-eligible retirees. Many military retirees never need Part D because TFL provides drug coverage.
VA Prescription Coverage
VA prescription benefits are creditable coverage for Part D purposes. Many veterans use VA pharmacies for prescriptions and never enroll in Part D.
Employer Group Health Plans
Most large employer plans (20+ employees) include creditable prescription drug coverage, but verify with your benefits administrator. The plan must annually certify and notify enrollees.
Union Health Trusts
Most union health and welfare funds offer creditable coverage. Check your annual benefits statement.
Indian Health Service (IHS)
IHS prescription coverage is creditable for Part D purposes for AI/AN beneficiaries.
Non-Creditable Coverage Sources
- COBRA: Verify with your plan. Some COBRA plans are creditable, some aren't.
- Marketplace plans: Most ACA marketplace plans are NOT creditable for Part D.
- Catastrophic-only plans: Generally NOT creditable.
- High-deductible health plans (without separate Rx coverage): May not be creditable.
How to Verify Your Coverage Is Creditable
- Look for the Notice of Creditable Coverage mailed each fall (usually September)
- Check your Summary Plan Description or benefits handbook
- Call your plan's member services and ask: "Is my prescription coverage creditable for Medicare Part D?"
- Get the answer in writing (email or letter) for your records
Strategic Considerations for New Mexicans
LANL, Sandia, Kirtland Federal Retirees
Your FEHB plan includes creditable drug coverage. You don't need to enroll in Part D unless you switch from FEHB to Medicare Advantage. Many federal retirees keep FEHB precisely because it provides excellent drug coverage at low retirement premiums.
State Government Retirees (PEBB)
New Mexico's Public Employees Benefits Bureau retiree plan typically includes creditable drug coverage. Verify with your retiree benefits office.
Veterans with VA Coverage
If you use VA pharmacies for prescriptions, you may not need Part D at all. Your VA coverage is creditable.
Don't Get Caught With a Permanent Penalty
The Part D penalty is permanent and adds up over time. A licensed Medicare agent can verify your coverage status and help you avoid unnecessary penalties.