What the appeal letter must contain
Checked against the current rules on September 23, 2026.
Unlike a Medicare Advantage reconsideration, Part D has real CMS model forms for both the first request and the redetermination — but the form alone rarely wins an appeal. The form gets your request in the right format; the letter is where you actually argue from the rule.42 CFR 423.582
CaseWhy Appeals prepares both together: the filled model form, and a letter that names the specific rule and connects it to your case's own facts.
A plan reviewer reads a lot of these. A letter that names the rule and connects it to the specific facts of the case reads as something that has to be taken seriously and answered on the merits — a letter that just restates disagreement is easy to uphold with the same boilerplate language as the original denial.
The identifying information
The enrollee's name, Medicare number, the plan name, the specific drug, and the date and reference number on the denial notice — so the plan can find the case immediately, not search for it.
If someone else is filing on the enrollee's behalf, that's also where the Appointment of Representative form comes in — without it attached, the plan isn't required to talk to anyone but the enrollee directly.
The rule it argues from
The strongest letters name the specific exceptions or coverage-determination rule that applies and explain how the facts of the case meet it — not just "this should be covered," but why, under the rule the plan is bound by.
This is exactly where a generic template falls short — it has no way to know which specific rule governs a given denial (a formulary exception, a tiering exception, step therapy, a quantity limit each turn on the same section but a different showing), so it either omits this section entirely or fills it with something too vague to actually engage with.
The prescriber's supporting statement
This is the one piece Part D's own rule genuinely requires that Medicare Advantage doesn't: for most exceptions, the plan's own clock to decide doesn't start until your prescriber's written statement arrives — a letter without it is, procedurally, an incomplete request.42 CFR 423.568
The facts that meet the rule
Whatever specific facts the applicable rule turns on — prior treatments tried, dosage history, why a preferred alternative wouldn't work — stated plainly, tied to the rule point they support.
A fact that isn't tied to a specific part of the rule reads as background, not evidence. The letter should make the connection explicit rather than leaving the reviewer to make it.
The request itself
A clear statement of what's being requested — that the plan grant the exception or reverse its denial — and, if it applies, a request for expedited review.42 CFR 423.584
The enclosures
The filled model form (if this level has one) plus a list of what else is attached — the prescriber's statement and any other evidence the specific rule calls for.
Questions people ask
- Do I need both the form and a letter?
- The model form alone gets your request in the right format, but it has no place to argue why the facts of your case meet the rule — that's what the letter adds, and it's usually what actually turns a denial around.
- Do I need a lawyer to write it?
- No — a redetermination request doesn't require legal representation. It does need to cite the right rule and the right facts, which is what CaseWhy Appeals' free preview shows you before you decide anything.
Sources — last checked September 23, 2026
- 42 CFR 423.568as of September 23, 2026
- 42 CFR 423.582as of September 23, 2026
- 42 CFR 423.584as 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.
