Half the clients who call with a Medicare Part D penalty did not realize their coverage had lapsed. The other half had employer drug coverage they assumed was good enough, without ever asking whether it met the creditable coverage standard. Both groups now carry a permanent surcharge on every Part D premium they will pay for the rest of their lives.
Key Takeaways
- The Medicare Part D late enrollment penalty equals 1 percent of the national base beneficiary premium for each full calendar month the client went without creditable drug coverage past their initial enrollment period. For 2026, the national base beneficiary premium is $36.78 per month. The penalty is permanent, added to the monthly Part D premium for life, and recalculated annually.
- Creditable drug coverage is prescription drug coverage that is expected to pay, on average, at least as much as standard Medicare Part D coverage. Employers with 20 or more employees must notify plan participants in writing by October 15 each year whether their coverage is creditable. The notice must also be sent when the plan year ends or when coverage changes.
- The seven-month Initial Enrollment Period (IEP) is the penalty-free window: three months before, the month of, and three months after the month the client turns 65. A client who misses the IEP without creditable coverage begins accruing the penalty the month after IEP ends. The only penalty-free path back is a qualifying Special Enrollment Period.
- Low-Income Subsidy (Extra Help) recipients do not accrue a Part D late enrollment penalty, regardless of how long they went without Part D coverage. Medicare and Medicaid dual eligibles are also exempt. These groups are enrolled in benchmark plans at no cost.
- TRICARE and most Federal Employee Health Benefits Program plans are creditable for Part D purposes. VA drug coverage is creditable if the client is enrolled in VA pharmacy benefits. Employer-sponsored retiree drug coverage and most group health plan drug benefits are creditable as long as the plan sponsor provides a timely CMS attestation.
How the penalty calculation actually works
The Medicare Part D late enrollment penalty equals 1 percent of the national base beneficiary premium for each full calendar month the beneficiary went without Part D or creditable drug coverage after the end of their Initial Enrollment Period. For plan year 2026, CMS set that base beneficiary premium at $36.78 per month.
A client who missed the IEP and went 24 months without coverage accumulates a 24 percent penalty: $36.78 times 0.24 equals approximately $8.83 per month added to whatever Part D plan premium they eventually enroll in. That amount is not capped, does not expire, and recalculates every January as CMS publishes the new base premium. The percentage is locked when the client enrolls; the dollar amount floats annually.
Example: a client assessed a 30 percent penalty in 2025 paid approximately $10 per month extra that year. In 2026, the same 30 percent penalty recalculates against $36.78 to produce a slightly different dollar amount. The broker explaining this to a client needs to distinguish between the locked penalty rate (the percentage) and the variable premium impact (the dollar amount that changes annually).
| Months without creditable coverage | Penalty rate | 2026 monthly penalty amount |
|---|---|---|
| 6 months | 6% | ~$2.21 |
| 12 months | 12% | ~$4.41 |
| 18 months | 18% | ~$6.62 |
| 24 months | 24% | ~$8.83 |
| 36 months | 36% | ~$13.24 |
Illustrative examples. Dollar amounts based on the 2026 national base beneficiary premium of $36.78. The base premium changes annually; the penalty percentage is locked at enrollment.
The Initial Enrollment Period and when the clock starts
Every Medicare-eligible individual gets a seven-month IEP: three months before the month they turn 65, the birthday month itself, and three months after. Enrolling in Part D during the IEP carries no penalty regardless of whether the client had drug coverage before. Enrolling after the IEP without a qualifying Special Enrollment Period starts the penalty accumulation the first full month after IEP ends.
The IEP clock is not intuitive. A client who turns 65 in July has an IEP running April through October. If they do not enroll in Part D by October 31 and have no creditable coverage, November is their first uncovered month. The next opportunity to enroll without a SEP is the Annual Enrollment Period (October 15 through December 7), with coverage starting January 1. A client who misses their IEP in October may not get Part D coverage until January, accumulating two uncovered months before they are even eligible to enroll.
The two relevant SEPs for Part D enrollment without penalty:
- Loss of creditable coverage SEP: two months from the date creditable drug coverage ends. Applies when an employer plan terminates, COBRA expires, or a retiree plan is discontinued.
- LIS/Extra Help SEP: any month for clients who gain or lose Low-Income Subsidy eligibility, or when a LIS-benchmark plan exits the county.
What counts as creditable coverage
CMS defines creditable coverage as drug coverage that is expected to pay, on average, at least as much as standard Medicare Part D. The key phrase is "on average": the test is actuarial, not plan-design-specific. A plan can have a higher deductible than Part D but still pass the test if it has lower cost sharing on high-cost drugs.
Coverage types that generally qualify:
- Employer and union group health plan drug benefits that pass the actuarial equivalence test and provide the annual October 15 notice.
- TRICARE (pharmacy benefits for active duty, retiree, and dependent beneficiaries).
- Federal Employee Health Benefits Program plans, which are all deemed creditable by CMS by statute.
- VA pharmacy benefits for veterans enrolled in the VA health care system.
- Indian Health Service drug benefits.
- COBRA continuation of a group plan that otherwise qualifies.
Coverage that does not qualify: excepted benefit plans, short-term health plans, standalone prescription drug discount cards, and most Medicare Supplement (Medigap) plans, which do not provide drug coverage at all. Medicare Advantage plans with Part D drug coverage (MAPD plans) satisfy the creditable coverage standard, but the client is already enrolled in Part D, so the question of credibility does not arise.
The employer notice requirement: what brokers must ask for
An employer with 20 or more employees that offers drug coverage must notify plan participants and Medicare-eligible dependents in writing by October 15 each year whether the coverage is creditable or non-creditable. The same notice is required within 30 days of the plan year start and within 30 days of a material coverage change that affects creditable status. CMS provides model notice language on its website.
The broker's task is straightforward: at every intake for a client who is over 65 or approaching 65 and has employer drug coverage, ask for the most recent creditable coverage notice. If the employer has not provided one, that is a compliance gap on the employer's end, not proof of creditable status. The client cannot benefit from coverage they cannot document.
Connecture and other broker platforms often prompt for this in the T65 workflow. QuoteTurbo surfaces the IEP timeline during plan comparisons for clients near 65 so the enrollment window is visible before it closes. Quotit does not flag this as part of its quoting output, which is a gap for brokers relying on it exclusively.
Clients exempt from the penalty
Two groups never accrue a Part D late enrollment penalty regardless of how long they went without drug coverage:
- Low-Income Subsidy (Extra Help) recipients: CMS auto-enrolls LIS-eligible beneficiaries in a benchmark Part D plan at no premium cost. The penalty clock does not run for LIS beneficiaries.
- Medicare and Medicaid dual eligibles: automatically enrolled in a D-SNP or a benchmark Part D plan. The penalty does not apply.
Beyond these two groups, the penalty runs without exception. There is no income-based waiver, no hardship waiver, and no grandfather clause for clients who "didn't know" they needed to enroll. The broker who tells a client the penalty can be waived later is creating future liability for themselves.
See employer group coverage and the Medicare secondary payer rules at 65 for how the employer size threshold intersects with Part B enrollment timing, a related decision that affects the same cohort of clients.
Appealing an incorrect penalty
The LEP can be appealed if CMS calculated it incorrectly. Common grounds: the client had creditable coverage CMS was not notified of, the month count in the penalty calculation is wrong, or the client qualified for LIS status that was not applied retroactively. The appeal path runs through the Part D plan's coverage determination process, escalating to the plan's redetermination, then a Qualified Independent Contractor (QIC), then the Medicare Appeals Council.
Successful appeals require documentation. The standard evidence is the creditable coverage notice from the prior employer or plan sponsor. Without it, the appeal is difficult to sustain. Brokers who document the notice at intake are positioned to help a client appeal successfully if the plan misapplies the penalty. Brokers who do not are in the same position as the client: appealing with nothing to show.
See Medicare broker compensation and CMS fair market value caps for context on the Medicare broker workflow that this Part D conversation typically sits inside.
Medicare Part D late enrollment penalty: broker FAQs
Common questions brokers encounter when clients learn about the Part D LEP for the first time.
How is the Medicare Part D late enrollment penalty calculated?
The penalty equals 1 percent of the national base beneficiary premium multiplied by the number of full calendar months the client went without creditable drug coverage. For 2026, the national base beneficiary premium is $36.78 per month. A client who went 18 months without creditable coverage owes an 18 percent penalty, or approximately $6.62 per month added to their Part D plan premium. Because the penalty is tied to the base beneficiary premium, which CMS sets annually, the dollar amount of the penalty changes every plan year even though the penalty percentage is locked at enrollment. A client assessed an 18 percent penalty in 2026 will owe a slightly different dollar amount in 2027 when the base premium updates.
What coverage counts as creditable for Medicare Part D purposes?
CMS defines creditable drug coverage as coverage that is expected to pay, on average, at least as much as standard Medicare Part D. The following types generally qualify: employer-sponsored group health plan drug benefits (if the plan passes the CMS actuarial equivalence test), TRICARE, the Federal Employee Health Benefits Program, VA pharmacy benefits for enrolled veterans, Indian Health Service, and CHAMPVA. Coverage that does not qualify includes coverage from excepted benefit plans, short-term health plans, and standalone drug discount cards. The plan sponsor is responsible for running the actuarial equivalence test and issuing the annual creditable coverage notice to participants. The broker's role is to ask for that notice and document whether the client was given one.
What happens if a client claims they had creditable coverage but has no documentation?
CMS requires a Part D plan sponsor to assess whether the penalty applies based on available information. If the client asserts they had creditable coverage but cannot produce the annual notice or employer attestation, the plan may still apply the penalty. The client can file a coverage determination request and appeal, but the burden of proof is on the client to demonstrate creditable coverage existed. Brokers should advise any client approaching Medicare to retain their annual creditable coverage notices from the prior employer or group plan. Retroactive proof is difficult to obtain once several years have passed. Keeping a copy of the October 15 notice is the single most important documentation step for this scenario.
Is the Part D penalty waived if the client had COBRA coverage?
COBRA continuation coverage that includes prescription drug benefits and meets the creditable coverage standard does not trigger the Part D penalty while the client maintains it. The critical issue is what happens when COBRA ends. When a client's COBRA coverage terminates, they have a two-month Special Enrollment Period to enroll in Part D without a penalty. If they miss that SEP window, the months after COBRA ends and before Part D enrollment count toward the penalty calculation. The SEP following COBRA termination is the same SEP available after losing any creditable drug coverage, but brokers frequently miss the trigger because the client does not know COBRA termination opens an enrollment window separate from AEP.
Can the Part D late enrollment penalty be appealed or waived?
CMS allows appeals of the Part D LEP through the plan's coverage determination and redetermination process, escalating to a Qualified Independent Contractor if needed. Grounds for appeal are limited: the client had creditable coverage CMS was not notified of, the months used to calculate the penalty are incorrect, or the client was exempt due to LIS status or dual eligibility that was not applied. Successful appeals result in the penalty being reduced or eliminated retroactively. Waivers outside the appeal process are not available. A client who simply forgot to enroll, and has no creditable coverage to document, does not have appealable grounds. The penalty is permanent absent a successful appeal.
