How to write a claim appeal letter that gets read

What goes in a claim appeal letter, and in what order?

Put the identifiers first, the ask second and the proof third. A reviewer reads dozens of these a day, so the letter has to answer "what is this, what do you want and where is the proof" in the first ten lines.

1. Re line: patient name, member ID, claim number, date of service, billed amount, rendering provider and your NPI.
2. The denial: the date of the notice, the CARC and RARC if you have them, and the reason quoted in the payer's words.
3. The request: one sentence, such as "reprocess the claim for payment of the allowed amount" or "overturn the denial and pay line 2."
4. The facts: three to six dated sentences in time order, each pointing to an exhibit number.
5. The basis: the policy, contract term or rule that supports you, quoted by number.
6. The exhibit list: numbered, in the same order as the facts.
7. The signature: a name, a title and a direct phone number of someone who can discuss the claim.

The packet contents for a medical necessity denial, including the crosswalk of policy to chart, are in how to appeal a CO-50 medical necessity denial. This post covers the letter that sits on top of any packet.

What should you check before you write it?

Confirm the route and the clock, then confirm the denial is not a form problem. A letter cannot fix a claim that was rejected for missing data, and a missed window cannot be fixed by a good letter.

• The route. The denial notice or the payer manual names the address, portal or fax and says whether a form is required. Send to that place, in that way.
• The deadline. Calendar it from the date on the notice. The timely filing limits by payer page shows where payers publish their terms.
• The type of denial. A CO-16 is fixed with a corrected claim. A CO-50 or CO-197 needs an appeal with evidence. See the CO-50 code page and the CO-16 code page.
• Who may file. A provider often needs the patient's written authorization or an assignment of benefits to appeal for a plan member. Check the plan's rules.

For Medicare the letter is a request for redetermination. Under 42 CFR 405.944(b) it must be in writing and should use the standard CMS form, but a written request is accepted if it has the beneficiary's name, the Medicare number, the specific services and dates, and the name of the party or its representative. Section 405.946(a) adds that you must explain why you disagree and should include the evidence. The five levels and their deadlines are in the five levels of Medicare appeals.

Should you ask the plan for its file first?

Yes, when the denial letter does not give you the reason or the criteria. For an employer-sponsored health plan under ERISA, 29 CFR 2560.503-1(h)(2)(iii) says a claimant gets, upon request and free of charge, reasonable access to and copies of all documents, records and other information relevant to the claim for benefits.

The denial notice itself has required content. Under 29 CFR 2560.503-1(g)(1), a notice of an adverse benefit determination must give the specific reasons, reference the plan provisions it rests on, describe any additional material needed to perfect the claim, and explain the review procedure and its time limits. For a group health plan, it must also name the internal rule, guideline or protocol relied on, or say a copy is available free on request.

A one-line request in the letter or a short earlier note does the job: "Please send the claim file, the clinical criteria applied and the plan provision cited." Then your appeal can answer the stated reason point by point. Plans under ERISA are described on the ERISA glossary entry; confirm in the denial notice or the plan document whether the plan is one.

What does a good letter look like?

Keep sentences plain and the order fixed. The sample below is made up to show the structure, and the numbers are illustrative.

What gets an appeal letter set aside?

• More than one ask. A letter that asks for payment, an apology and a policy change gets none of them. Make one request per claim.
• Missing identifiers. A letter without the claim number or date of service goes to the back of a queue while someone matches it.
• Arguing from the heading. Quote the exact reason on the notice, then answer that reason. Do not answer a different denial.
• Facts without proof. Every sentence in the facts section needs an exhibit number. Say what page and what line.
• Late additions. Medicare adds up to 14 calendar days to its decision time for each evidence submission after the request (42 CFR 405.946(b)), so send everything at once.
• Heat. Do not describe the reviewer or the payer. Describe the claim.

Batching is a judgment call. If one policy issue denied many claims, one letter with a schedule of claims can work if the payer allows it, but each claim still needs its own identifiers. Confirm the payer accepts batched appeals before you send one.

How do you send it and track the answer?

Send it in a way that produces a dated receipt, then put the decision date on the calendar the same day. A portal submission with a confirmation number or a trackable delivery beats a plain envelope.

For an employer-sponsored group health plan that provides one level of appeal, 29 CFR 2560.503-1(i)(2)(iii)(A) requires a decision on a post-service claim within 60 days after the plan receives the request for review. Medicare gives its contractor 60 calendar days to decide a redetermination under 42 CFR 405.950. Plans can extend in set circumstances, and the regulation counts from the plan's receipt of the request, so the receipt date matters.

Log every contact with the date, the channel and the reference number. If the first answer is a denial, the next level, the deadline and the evidence rules differ by payer. For Medicare, the next stage is a QIC reconsideration within 180 calendar days under 42 CFR 405.962.

How Nucleus Align handles appeal letters

We work denials within 48 hours, and our denial management team writes the letter to the denial reason, attaches numbered exhibits and tracks the payer's decision date. The wider method is in the denial management playbook. Book a call to review a set of denials, or read more on the blog.