Medicare Part D denied reimbursement for a drug you paid for yourself? What the rule says and how to appeal.
Checked against the current rules on September 23, 2026.
A denial for reimbursement for a drug you paid for yourself isn't the end of the story — Medicare Part D plans have to follow specific coverage rules, and a denial that doesn't square with those rules is exactly the kind of appeal that tends to win.
Here's what the rule actually requires, what evidence usually turns a denial around, and the deadline you're working against.
What the rule requires
Coverage for reimbursement for a drug you paid for yourself under a Medicare Part D plan is governed by§ 423.568 Standard timeframe and notice requirements for coverage determinations.. A Medicare Part D plan generally cannot apply a stricter test than what these rules require.
Questions that decide it
Before you appeal, these are the facts that usually decide whether a denial like this holds up:
Do you have the pharmacy receipt showing what was paid?
Why was it paid out of pocket instead of billed to the plan — the pharmacy said it wasn't covered, or there wasn't time to wait for a coverage determination?
How long ago was the purchase — is the request still within the plan's own filing window for a payment request?
What a winning appeal has to show
An appeal that wins usually includes:
The original pharmacy receipt — §423.568(c) requires the plan to notify the enrollee of its determination and make payment (when applicable) no later than 14 calendar days after receiving the request — the receipt is the request's own evidence of amount and date. (You or your family provide this.)42 CFR 423.568
The prescription itself and any prior communication with the pharmacy — Showing the drug was validly prescribed and that the pharmacy either couldn't process it through the plan or told the family it wasn't covered helps establish why payment happened out of pocket rather than through the plan directly. (You or your family provide this.)
Your deadline to appeal
No deadline to make this first request — it's your initial ask, not yet an appeal. The 65-day appeal clock only starts once the plan denies it.42 CFR 423.566
The plan itself then has its own clock to decide. 72 hours for a standard drug-benefit request (24 hours if expedited). For an exception request, the clock instead runs from receipt of your prescriber's supporting statement — 72 hours standard / 24 hours expedited from that point, or from the end of a 14-day wait if the plan never receives one. Payment requests: 14 calendar days (42 CFR § 423.568, § 423.570, § 423.572).
What to ask your doctor to address
If you're asking the treating physician for a supporting letter, it should speak to:
Questions people ask
- Can the plan just say it's "not medically necessary" with no further explanation?
- The denial notice has to explain the basis for the decision and tell you how to appeal. If it doesn't point to a specific rule or criteria, that's itself worth raising in your appeal — you're entitled to know what standard was applied.
- What if I don't have all the evidence listed above?
- Include what you have. An appeal with partial evidence and a clear explanation of the rule still gets a real review — it doesn't need to be complete to be worth filing.
Sources — last checked September 23, 2026
- § 423.568 Standard timeframe and notice requirements for coverage determinations.as of September 23, 2026
- 42 CFR 423.566as of September 23, 2026
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By CaseWhy Appeals editorial. See how this content is produced. Not legal advice. Not affiliated with or endorsed by Medicare, CMS, or any health plan. A product of CaseWhy LLC.
