Your denials have a solution. Templates, Resolution Kits, and more.

If you have ever wished you had all of your appeals resources in one place, the Appeals Hub is for you. We have compiled appeal templates, resolution kits, denial briefs, comprehensive guides, and other valuable resources to save you time and frustration. This resource is always growing so if there is something you need, check back or let us know. This resource is for you.

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Working denials does not have to be difficult or time consuming. You just need a documented, repeatable process that includes appeal templates for your most common denials, and a resolution process for denials that do not require appeals. Every ROI appeal template follows a seven-part structure that includes all of the fields you need to write the most effective appeal letter. Simply fill in the details, and attach the letter with your supporting documentation. For denials that require corrections rather than an appeal, ROI has created Resolution Kits to guide you towards revenue recovery and help you create your own workflows so messy, fragmented denials management processes are a thing of the past.

Master guide

How to write a medical billing appeal letter

The full 7-part anatomy, the sample letter, the crosswalk of denial types to templates, and the common mistakes that get appeals denied on procedure alone.

Read the master guide →
Templates library

Appeal templates by denial type

Ready-to-send letter templates organized by denial pattern, medical necessity, prior auth, coding, timely filing, and more.

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Denial brief

EDI Code Intelligence Lab

The authoritative CARC and RARC reference. Every code, every combination, the plain-language explanation, the action plan, and whether an appeal is actually the right path.

Browse the Lab →
Resolution Kits

Denials that do not need an appeal

Denials do not always equal appeals. In some cases, the real solution is a corrected claim. For those situations, ROI has created Resolution Kits to help you work through determining what you need, what corrections are required, and how to update the claim for the quickest resolution.

Open the Resolution Kits →

The Anatomy of an Appeal

Every ROI appeal template follows the same structure. This structure is what ensures no detail is left out. Missing any one of these details is often why appeals get denied. Most denied appeals are not denied based on the merit of the appeal. They are denied because the claim or the patient was not easy to find, so the appeal was set aside. You could have a completely justifiable appeal that is denied because your appeal letter did not contain one critical piece of information. Using templates can help you standardize that process so no detail is left out.

The Format

Part 01

Practice and/or Provider Information

On practice letterhead start with:

  • Provider Name and Credentials
  • Practice or Facility Name, NPI and Tax ID
  • Address
  • Contact Information
  • Appeal Date
Part 02

Payer and Patient Information

Accurately provide the following:

  • Payer Name
  • The correct appeals or resolution department*
  • Payer Address*
  • Contact Information
  • Patient Name
  • Member ID/Policy ID
  • Patient's date of birth

*check the payer's website, or look for the correct department on the EOB

Part 03

Claim Details and Appeal Purpose

  • Procedure code(s) denied/being appealed
  • Denial/explanation code(s) with description
  • Payer Claim/ICN number
  • Date of Service

Always open with a clear, concise and direct statement that addresses the reason for the appeal. Example: "We are writing to formally appeal the denial of coverage for..."

Part 04

Detailed Argument

This is the core of your appeal. State plainly why the denial is wrong, whether the argument is clinical (medical necessity, distinct service), policy-based (payer, or LCD/NCD, for example), regulation or guideline based (AMA, CMS, etc.) or contractual. State why the service should be covered based on argument (e.g., if policy based, be prepared to indicate what policy applies, and why the services meets the policy criteria). Use authoritative sources, such as AMA, LCD, NCD, CMS, etc. Cite your sources.

Part 05

Supporting Documentation & Evidence

  • Operative notes, progress notes, or encounter summaries
  • Specialist consult notes/other clinical evidence
  • Diagnostic imaging, labs, or test results
  • Referral or prior authorization (if obtained)
  • Copies of payer policy showing coverage criteria
  • Reimbursement advice/denial notice
  • Literature/Guidelines/other polices supporting medical necessity from authoritative sources
Part 06

Explicit Request for Reconsideration

Tell the payer exactly what you want. Such as: "Reprocess claim [number] with allowed amount reflecting [rate]" or "Overturn the denial and pay the claim at the contracted rate." Ambiguity gives the payer permission to close the file without acting.

Part 07

Signature and Credentials

Provider or authorized representative's name, title, credentials, including the NPI. For clinical or necessity appeals, a clinician's signature carries the most weight. For coding denials, having a certified coder listed as the contact person can help minimize friction in those situations. A named, reachable signer always makes follow-up easier.

Want all of the details?

How to write a medical billing appeal letter.

Read the How to Guide →

Denial-specific how-to guides

Every guide is written from the CARC/RARC perspective, aligned with the ROI EDI Code Intelligence Lab, and links to the exact template and decode. If a denial is rarely appealable (bundling, benefit maximum, plan provision) the guide says so up front and tells you the correct resolution path instead.

Appeal guide

CARC 50, medical necessity

How to appeal a medical necessity denial

Building the clinical argument. LCD and NCD citations. What the reviewer is actually looking for in the chart.

Read the guide →
Appeal guide

CARC 197, prior authorization

How to appeal a prior authorization denial

Retro auth path, urgent-service exceptions, and how to unwind a claim denied for the wrong authorization number.

Read the guide →
Appeal guide

CARC 29, timely filing

How to appeal a timely filing denial

Proof of submission, common payer windows, exceptions in federal, state, and contract, and how to structure the evidence.

Read the guide →
Appeal guide

CARC 4, missing modifier

How to appeal a missing modifier denial

Corrected claim vs. appeal decision. Modifiers 25, 59, X-modifiers, 26, 50 and when each one is defensible.

Read the guide →
Appeal guide

CARC 11, diagnosis/procedure mismatch

How to appeal a Dx/procedure mismatch denial

The LCD test, the specificity fix, and how to distinguish a coding error from a genuine coverage dispute.

Read the guide →
Appeal guide

CARC 97, bundling

How to appeal a bundling denial

Rarely an appeal. NCCI indicator check first, then the modifier and documentation needed when unbundling is genuinely warranted.

Read the guide →
Appeal guide

CARC 18, duplicate claim

How to resolve a duplicate claim denial

CARC 18 is rarely an appeal. Corrected claim first, with modifier 76, 77, or 91 for legitimate repeats. Appeal only in narrow scenarios.

Read the guide →
Appeal guide

CARC 96, non-covered service

How to appeal a non-covered service denial

Reading the paired RARC is what separates a two-minute write-off from a winnable appeal. ABN triggers and coverage-carve-out exclusions.

Read the guide →
Appeal guide

Coordination of benefits

How to appeal a coordination of benefits (COB) denial

Determining primary vs. secondary, correcting the COB file, and appealing when the payer's COB record is wrong.

Read the guide →

Also in the Appeals Hub

Field report

Denial Patterns & Root Causes

A practice-by-practice look at where revenue leaks out of the claim cycle, what drives the denial, and where to look first on the EOB.

Download the guide →
Field report

Appeal Strategy Playbooks

Four appeals cover 80% of the denials you will write this quarter, with the steps and letter templates to adapt quickly.

Download the guide →
Module

The revenue integrity blueprint

The 90-day operational plan that prevents most of these denials from ever hitting the appeal queue.

Read the module →
Library filter

All denial-related content

Filter the ROI Library

See every appeal template, decode, guide, and field report in the ROI Library, filtered to appeal-related content only.

Open filtered library →
Reference

Deadlines and appeal windows

Payer timely filing limits

Filing deadlines and appeal windows for 118 commercial and government payers, sortable and searchable. The 10 largest national payers are free to everyone, with direct links to their published policies.

Open the reference →