A Medicare appeal letter sample shows the five details a contractor needs to accept a written appeal: the beneficiary's name, the Medicare number, the specific service, the date of service and the name of the party appealing. A good letter then answers the exact denial reason on the notice and lists the attached evidence that supports it.
A Medicare appeal letter sample for a denied claim
A Medicare appeal letter for a denied claim is a written redetermination request that a provider sends to the Medicare Administrative Contractor (MAC) instead of Form CMS-20027. The sample below is a first-level request from a fictional physician practice. Each element the rules require is labelled in brackets.
This letter is an example for illustration, not legal advice. The patient, practice, provider, Medicare number, claim number and amounts are all invented. Schema Care does not write or file appeals.
[Party appealing: provider, with address] Northgate Example Cardiology, 200 Sample Avenue, Suite 4, Springfield, ST 00000
[Date sent] July 20, 2026
[Addressed to the contractor named on the remittance advice] Redeterminations Unit, Sample MAC Jurisdiction 0 (example), PO Box 0000, Springfield, ST 00000
Re: Request for redetermination
[Beneficiary name, required] Walter J. Sample
[Medicare number, required] 1EG4TE5MK73 (example)
[Claim number from the remittance advice] ICN 0000000000001 (example)
[Service, required] Transthoracic echocardiogram, CPT 93306, 1 unit, billed $410.00 (example)
[Date of service, required] 05/11/2026
[Date of initial determination notice] Remittance advice dated 06/01/2026, copy attached
[Statement of dissatisfaction] Northgate Example Cardiology requests a redetermination of the denial of the service above.
[The denial reason, quoted from the notice] The remittance advice denied the line with group code CO and reason code 50, which the X12 code list describes as "These are non-covered services because this is not deemed a 'medical necessity' by the payer."
[Answer to that reason] The ordering physician's note of 05/04/2026 records the reason the test was ordered and the diagnosis code billed on the claim. That note was not sent with the original claim. It is attached, together with the signed order.
[Evidence list] Enclosed: (1) remittance advice dated 06/01/2026; (2) signed order dated 05/04/2026; (3) office note dated 05/04/2026; (4) echocardiogram report dated 05/11/2026.
[Request] Please reverse the denial and process the line for payment.
[Name of the party or representative, required, with contact] Dana Example, Billing Manager, for Northgate Example Cardiology, (000) 555-0100
[Signature] Dana Example
The quoted code text comes from the X12 Claim Adjustment Reason Codes list. Swap in the code and wording printed on your own notice.
The same structure works at level 2, with two changes the rules add: name the contractor that made the redetermination, and attach any document the redetermination notice said was missing.
Which details do Medicare contractors check in an appeal letter?
Medicare contractors check that a written appeal letter contains the beneficiary name, the Medicare number, the specific service or item, the specific date of service and the name of the party or its representative. A provider letter missing any of these is treated as incomplete and dismissed, not decided.
These five items come from 42 CFR 405.944(b), which says a written request that is not on the standard CMS form must contain them. The Medicare Claims Processing Manual, chapter 29, section 310.1, repeats the list and says that when one is missing from a request filed by a provider or other non-beneficiary party, the contractor issues a dismissal notice explaining what must be included.
The manual is lenient about where the details sit. If a required item is missing from the letter itself but appears in an attached document, such as dates of service highlighted on an attached remittance advice, the request substantially complies and should not be dismissed for that reason. Putting every item in the letter is still the safer habit.
A letter also has to read as an appeal. Section 310.1 says a letter counts as a redetermination request if it carries the required items and either asks the contractor to take further action or says the party is dissatisfied with the decision. The "Statement of dissatisfaction" line in the sample covers that.
At level 2, the list grows by one. 42 CFR 405.964(b) adds the name of the contractor that made the redetermination.
For letters to commercial insurers, where no federal list applies, the general structure is in the parts every medical appeal letter needs.
When is a Medicare appeal letter better than the standard form?
A Medicare appeal letter is better than the standard form when the argument needs more room than the form's two text boxes, when one request covers several lines that each need a separate answer, or when your practice already produces letters from a template. The form is better for a short, single-line appeal.
Both routes are valid. The CMS first-level redetermination page offers Form CMS-20027 or a written request with the required details plus an explanation of the disagreement. The CMS second-level reconsideration page does the same for CMS-20033.
The form has one clear advantage: its labelled boxes prompt for every required item, so it is hard to leave one out. Chapter 29, section 310.1, says a completed CMS-20027 means all applicable spaces are filled and all necessary attachments are included. A letter has no such prompts, which is why the sample labels each element.
A letter wins when the case has parts. A denial covering three dates of service with different missing documents is easier to answer in numbered paragraphs than in one box. Some practices attach a short letter to a completed form to get both. Which level you are at, and which form goes with it, is set out in the five Medicare appeal levels and the form for each.
Who drafts these letters is a staffing question. The post on in-house vs outsourced medical billing covers how practices split that work. Chapter 29, section 240.3, notes that a billing company's failure to file on time is not good cause for a late appeal, so the deadline stays the provider's problem either way.
Medicare appeal letters that skip the denial reason
A Medicare appeal letter that skips the denial reason argues in general terms, such as "this service was necessary and should be paid", without answering the specific code and explanation on the notice. Reviewers decide the issue the notice raised, so a letter that never addresses it gives them nothing new to decide on.
The fix starts with the notice. Copy the group code, reason code and any remark code from the remittance advice, and quote what they mean. A CO-50 line says the payer did not consider the service medically necessary. A CO-16 line, which the X12 list describes as "Claim/service lacks information or has submission/billing error(s)", points to missing information. Those two need different letters: the first needs the clinical record that supports the service, the second needs the missing information.
Some denial reasons should not get a letter at all, because the CMS first-level page says MACs do not process corrections of minor errors and omissions through the appeals process. That split is explained under filling in the Medicare redetermination form as a provider.
At level 2, a vague letter costs more: under 42 CFR 405.966, evidence not submitted at reconsideration is generally barred from later levels absent good cause. The rule is covered in what evidence belongs with a Medicare reconsideration.
The supporting records usually come from the chart: orders, notes and reports. The clinical records category covers pulling those documents. Medicare Advantage plans issue their own denial notices and run a different process, set out in Medicare Advantage appeals and grievances.
Getting the denial code right on the remittance is the step before the letter. Schema Care reads EOB service lines and remark codes with a confidence score per field, and sends the low-scoring ones to a reviewer who checks them against the page, as described in how human review works.