The CMS-20027 form: a family walkthrough
CMS-20027 is CMS's own standard way to ask your Medicare Administrative Contractor (MAC) to redetermine a denied claim — the Level 1 request on the claims ladder.CMS
It's a short, one-page form, and most families can fill it out themselves — the field that actually decides most cases is the plain-language statement of why you disagree, not any of the identifying fields around it.
Beneficiary and claim information
The beneficiary's name, Medicare number, the specific item or service, the date it was received, and the date on the Medicare Summary Notice or redetermination notice — the exact facts that let the MAC find your claim.CMS
The MAC's own name goes here too, if you know it — printed on the MSN itself.
Who's appealing
The form asks specifically whether the person appealing is the beneficiary, a provider or supplier, or a representative — not just a name. This matters because it can affect what evidence-preclusion rules apply later in the process.CMS
Why you disagree
This is the field that actually does the work — a plain statement of why the denial is wrong, ideally naming the specific rule and the facts that meet it, not just "I disagree."
A generic, one-line disagreement statement is one of the most common reasons a redetermination request doesn't succeed — the MAC's own reviewer needs something specific to actually respond to.
Evidence and the overpayment question
The form asks whether you have evidence to submit, and separately whether this appeal involves an overpayment (money Medicare is trying to recover) rather than an ordinary denied claim — a different track with its own rules.CMS
If you're filing late
There's a specific field for the reason a request is being filed after the 120-day deadline — a real, honest explanation (a serious illness, a death in the family, not receiving the notice) is what the good-cause standard asks for.CMS
Contact and signature information
The form also asks for the appealing party's own mailing address, phone number, and an optional email — where the MAC's own decision, and any request for more information, actually gets sent.CMS
A signature and date at the bottom are required — an unsigned form is treated as incomplete, the same as if key fields were left blank.
Where CMS-20033 fits in later
If the MAC's redetermination is unfavorable, the next level uses a near-identical form — CMS-20033, the Reconsideration Request — sent instead to the Qualified Independent Contractor named in the redetermination notice. The two forms share the same 20 fields, just addressed to a different reviewer.
Questions people ask
- Do I have to use this exact form?
- No — a clear written request with the same information generally works too. The form just makes sure nothing gets left out, which is why CaseWhy Appeals fills it in for you alongside a real argued letter.
- What if I'm not sure which box to check for 'who's appealing'?
- For most families, that's the beneficiary — check that box unless a provider, supplier, or formally appointed representative is the one actually filing.
Sources
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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.
