Healthcare Claims Appeals Resource Center
65% of denied claims are never appealed — and up to 90% of denials are recoverable. This resource center covers everything you need to file effective appeals: types, timelines, documentation, and how to write letters that win.
Quick Answer
A claim appeal is a formal request to a payer to reconsider a denied claim. The appeal process involves gathering clinical documentation, writing an appeal letter citing payer policy, and submitting within the payer's deadline (typically 90–180 days from the remittance date). Medicare has a 5-level appeal process; commercial payers have their own multi-step processes.
Key Takeaways
Appeals are for disputing denials you believe are incorrect — not for fixing claim errors (use corrected claims for those).
Always submit appeals within the payer's deadline (typically 90–180 days from remittance).
Strong clinical documentation is the #1 factor in appeal success.
Medicare has a 5-level appeal process: Redetermination → Reconsideration → ALJ → DAB → Federal Court.
Track appeal outcomes by denial code and payer to identify patterns.
Step-by-Step
Review the denial reason
Read the CARC and RARC codes to understand why the claim was denied. Determine if an appeal is appropriate or if a corrected claim would resolve the issue.
Gather supporting documentation
Collect clinical notes, operative reports, payer policy citations, prior authorization records, and any other documentation that supports your position.
Write the appeal letter
Include patient info, claim number, date of service, denial reason code, and a clear explanation of why the denial should be overturned. Reference specific payer policies.
Submit within the deadline
File the appeal within the payer's deadline (typically 90–180 days from the remittance date). Keep proof of submission.
Monitor and follow up
Track the appeal status. Payers typically respond within 30 days for standard appeals. If denied, review the rationale before escalating.
Common Mistakes
Filing an appeal when a corrected claim would resolve the issue — appeals take longer.
Missing the appeal deadline — late appeals are automatically denied.
Submitting appeals without clinical documentation — weak appeals rarely succeed.
Not referencing the specific payer policy that supports coverage.
Not keeping proof of submission.
FAQ
Related Resources
Appeal Types
The 4 Levels of Healthcare Appeals
First-Level Appeal
Filed directly with the payer. Uses the payer's standard appeal form or letter. Must include the original claim information, denial reason, and supporting documentation. Most payers require first-level appeals within 30–180 days of the denial date.
Second-Level Appeal
Filed after a first-level appeal is denied. Often reviewed by a different clinical reviewer or appeals committee. May require additional medical records, peer-to-peer review request, or independent medical review submission.
External Appeal
Reviewed by an independent review organization (IRO) outside the payer. Required under ACA for commercial plans. IRO decisions are binding on the insurer. Used for medical necessity denials and experimental/investigational treatment denials.
Grievance
A formal complaint to the plan about service, access, or quality issues — distinct from a clinical appeal. Grievances address issues like network access, customer service, or discriminatory treatment.
How to Appeal
6-Step Denial Appeal Process
Identify the Denial Reason
Read the CARC and RARC codes on the ERA/EOB. Understand exactly why the claim was denied before taking any action.
Determine Appealability
Not all denials are appealable. Timely filing denials, duplicate claims, and non-covered services often cannot be successfully appealed. Prioritize denials where clinical documentation can overturn the decision.
Gather Supporting Documentation
Collect clinical notes, physician orders, prior authorization records, medical necessity documentation, and any payer-specific forms required for the appeal type.
Write the Appeal Letter
Address the specific denial reason. Cite the relevant clinical criteria, payer policy, or coverage guideline. Include policy numbers, dates of service, and all claim identifiers.
Submit Within the Deadline
Appeal deadlines vary by payer and appeal level — typically 30–180 days from the denial date. Missing the deadline forfeits your appeal right in most cases.
Track and Follow Up
Document submission dates, confirmation numbers, and expected decision timelines. Follow up if you don't receive a decision within the payer's stated turnaround time.
Appeal Deadline Reference
Always verify current deadlines against the payer's provider manual — these are general benchmarks.
| Payer Type | Appeal Level | Typical Deadline | Decision Timeline |
|---|---|---|---|
| Medicare Part A/B | Redetermination (Level 1) | 120 days from RA date | 60 days |
| Medicare Part A/B | Reconsideration (Level 2 — QIC) | 180 days from redetermination | 60 days |
| Medicare Advantage | First-Level Appeal | 60 days from denial | 30–60 days |
| Commercial (ACA) | Internal Appeal | 180 days from denial | 30–60 days |
| Commercial (ACA) | External Appeal | After internal exhausted | 45–60 days |
| Medicaid | State Fair Hearing | Varies by state (30–90 days) | Varies |
Frequently Asked Questions
Healthcare Claims Appeals Resource Center FAQ
How long does a healthcare provider have to appeal a denial?
Appeal deadlines vary by payer and plan type. Commercial plan first-level appeal deadlines are typically 30–180 days from the denial date. Medicare Part A and Part B appeals must be filed within 120 days of the Remittance Advice date for redeterminations. Medicare Advantage plans must receive appeals within 60 days. Medicaid appeal deadlines vary by state — typically 30–90 days. Always check the payer's provider manual for the specific deadline.
What documentation should be included in a medical necessity appeal?
A medical necessity appeal should include: (1) the original claim with all supporting codes and modifiers, (2) clinical notes from the date of service and relevant prior visits, (3) physician order or referral, (4) relevant diagnostic test results, (5) treatment plan showing why the denied service was required, (6) the payer's own coverage criteria or clinical policy bulletin, and (7) relevant peer-reviewed clinical literature if the service deviates from standard protocols.
What is a peer-to-peer review and when should I request one?
A peer-to-peer review is a clinical conversation between the treating provider and the payer's medical reviewer to discuss a medical necessity denial. It is most effective for complex clinical cases, inpatient or outpatient surgical procedures, high-cost medications, and advanced imaging. Peer-to-peer reviews must typically be requested within 14–30 days of the denial.
What is the difference between an appeal and a resubmission?
A resubmission corrects a claim that was denied for an administrative or correctable billing error — wrong modifier, missing information, incorrect code — and resubmits it as a corrected claim. An appeal is a formal challenge to a payment decision that the payer made correctly based on the information they had — typically a medical necessity denial, authorization denial, or coverage dispute.
What is an external appeal and when is it available?
An external appeal is a review by an Independent Review Organization (IRO) that is completely independent of the payer. The ACA requires all non-grandfathered commercial health plans to provide an external appeal option after the internal appeal process is exhausted. IRO decisions are binding on the insurer.