Medicare Denied Prescription Drug (Part D)

What This Means

Your Medicare Part D drug plan has decided not to cover a prescription drug your doctor prescribed. You may have received a notice at the pharmacy titled “Medicare Prescription Drug Coverage and Your Rights,” or you may have received a denial letter from your plan.

This is not the end of the road. Part D plans have a specific process for requesting exceptions, and your doctor can play a key role in getting the decision reversed.

Why This Happens

• The drug is not on your plan’s formulary. Every Part D plan has a list of covered drugs called a formulary. If your drug isn’t on the list, the plan won’t cover it unless you get a formulary exception.
• Prior authorization was required. Your plan requires advance approval for certain drugs. If your doctor prescribed the drug without getting prior authorization, the pharmacy claim will be denied.
• Your prior authorization expired. If your medication previously required and received prior authorization, that approval typically lasts 12 months. When it expires, your refill will be denied until the authorization is renewed. Neither the plan nor the prescriber proactively renews it — you find out at the pharmacy counter. Ask your doctor’s office to submit a renewal right away, and ask your plan for a temporary 30-day emergency supply while it’s being processed.
• Step therapy requirements weren’t met. Your plan requires you to try a less expensive or preferred drug first. If you haven’t tried the required drug (or your plan doesn’t have records showing you did), coverage is denied.
• The drug is on a higher cost tier. Your drug may be on the formulary but placed on a higher cost-sharing tier, making it more expensive than you expected. You can request a tiering exception.
• Quantity limits were exceeded. Your plan may limit the amount of a drug you can get in a given time period. Prescriptions that exceed these limits will be denied.

Should You Appeal?

What To Do Next

1. Check if your drug has new cost protections. Before appealing, make sure the denial isn’t a billing error for a drug that should now be cheaper or free:
   • Insulin is capped at $35 per month for all Part D plans (as of 2025, under the Inflation Reduction Act).
   • Adult vaccines recommended by the CDC (ACIP) are covered at $0 cost-sharing under Part D.
   • Weight loss GLP-1s (Wegovy, Zepbound): The Medicare GLP-1 Bridge program has covered these drugs at a $50 copay for eligible beneficiaries since July 1, 2026, and runs through December 31, 2027. This is a separate CMS program — your doctor submits prior authorization to CMS’s central processor, not to your Part D plan. See our GLP-1 coverage guide for eligibility details.
   • If your out-of-pocket drug costs are high, ask your plan about the Medicare Prescription Payment Plan, which lets you spread your annual out-of-pocket costs into monthly installments instead of paying everything at the pharmacy counter.
2. Don’t leave the pharmacy empty-handed if you need the medication urgently. Ask your pharmacist about paying out of pocket for a short supply, or ask your plan about a temporary transition supply.
3. Contact your prescribing doctor. Tell them the drug was denied and ask them to submit a supporting statement to your plan. This is the single most important step — plans require a prescriber’s statement for exception requests.
4. Request a coverage determination or exception. You, your doctor, or someone you authorize can call or write to your Part D plan to request:
   • A formulary exception (to cover a drug not on the formulary)
   • A tiering exception (to pay less for a drug on a higher cost tier)
   • A step therapy exception (to skip the requirement to try another drug first)
   • A prior authorization (to get advance approval for a restricted drug)
5. Request an expedited decision if your health is at risk. If your doctor states that waiting could seriously harm your health, the plan must decide within 24 hours instead of the standard 72 hours.
6. If your request is denied, appeal — and watch the deadlines, because Level 2 does not happen on its own. Your denial notice will include instructions. The first appeal (called a “redetermination”) goes back to your plan, and you have 65 days from the date on the denial notice to ask for it. If the plan upholds its denial, you must file the next appeal yourself — you have 60 days from the date you receive the plan’s redetermination decision to file a written reconsideration request with the Independent Review Entity (IRE). Your plan’s decision letter will tell you where to send it. Cases move to the IRE automatically only in narrow circumstances: when your plan misses its own decision deadline, and for certain drug-management (“at-risk”) determinations. Do not wait for a case that will not move.
7. Get free help. Contact your State Health Insurance Assistance Program (SHIP), call 1-800-MEDICARE (1-800-633-4227), or visit Medicare.gov.

Part D Appeal Timeline

Every level after the first requires you to file — the case does not advance by itself. The exceptions are narrow: if your plan misses its own decision deadline, the request is forwarded to the IRE for you, and certain drug-management (“at-risk”) determinations are auto-forwarded as well. If you miss the 65-day redetermination deadline, you can still file late by giving a reason for the delay — but do not count on it.

Sources

• Medicare.gov: Appeals in a Medicare Drug Plan — the 65-day redetermination deadline and the 60-day deadline to file with the Part D IRE
• 42 CFR 423.600 — the enrollee (or prescriber) must file a written reconsideration request with the IRE within 60 calendar days of receiving the plan’s redetermination
• 42 CFR 423.590 — when a plan misses its own redetermination deadline, that failure is itself an adverse decision and the plan must forward the request to the IRE
• CMS: Part D Coverage Determinations
• CMS: Part D Exceptions
• Medicare.gov: Drug Plan Rules

Frequently Asked Questions