Medicare Appeals Process: How to Challenge a Denied Claim

Medicare beneficiaries have a federally established right to challenge coverage and payment decisions through a five-level administrative appeals system. A denied claim does not represent a final outcome — the appeals process provides structured pathways to seek reconsideration, independent review, and ultimately judicial hearing. Understanding the mechanics, deadlines, and classification of each level is essential for beneficiaries, providers, and representatives navigating disputes over Original Medicare, Medicare Advantage, and Part D prescription drug coverage.

• Definition and scope
• Core mechanics or structure
• Causal relationships or drivers
• Classification boundaries
• Tradeoffs and tensions
• Common misconceptions
• Checklist or steps (non-advisory)
• Reference table or matrix

Definition and scope

The Medicare appeals process is a formal administrative adjudication system codified under Title XVIII of the Social Security Act and governed by regulations at 42 C.F.R. Part 405 (Original Medicare), 42 C.F.R. Part 422 (Medicare Advantage), and 42 C.F.R. Part 423 (Part D). An "appeal" in Medicare terminology is any request to review a determination about whether Medicare will cover an item or service, or about the amount Medicare will pay.

The scope of the process extends to:

• Initial determinations — the first coverage or payment decision issued by Medicare contractors or plans
• Redeterminations and reconsiderations — the first two administrative review steps
• Independent adjudication — review by a Qualified Independent Contractor (QIC) or Independent Review Entity (IRE), depending on program type
• Administrative Law Judge (ALJ) hearings — federal quasi-judicial proceedings
• Medicare Appeals Council review — board-level review within the Department of Health and Human Services (HHS)
• Federal district court review — Article III judicial review available after exhausting administrative remedies

The Centers for Medicare & Medicaid Services (CMS) administers the program and sets the dollar thresholds, timeframes, and procedural requirements that govern each level.

Core mechanics or structure

Level 1 — Redetermination

The first appeal is filed with the Medicare Administrative Contractor (MAC) that processed the original claim. Beneficiaries and providers have 120 calendar days from receipt of the initial determination to file a redetermination request. The MAC must issue a written decision within 60 days of receiving the request (CMS Medicare Claims Processing Manual, Chapter 29).

Level 2 — Reconsideration by a Qualified Independent Contractor

If the redetermination is unfavorable, the appellant may request reconsideration by a QIC within 180 calendar days of receiving the redetermination notice. The QIC operates independently from the MAC. For Part C (Medicare Advantage) and Part D, the independent review is conducted by a CMS-contracted Independent Review Entity (IRE), not a QIC. The QIC must issue a decision within 60 days for fee-for-service claims.

Level 3 — Administrative Law Judge Hearing

An ALJ hearing is available when the amount in controversy (AIC) meets a minimum dollar threshold — CMS adjusts this threshold annually; for calendar year 2024, the ALJ hearing AIC threshold is $180 (CMS Office of Medicare Hearings and Appeals). Requests must be filed within 60 days of the QIC reconsideration decision. The Office of Medicare Hearings and Appeals (OMHA) manages this level.

Level 4 — Medicare Appeals Council

The Medicare Appeals Council (MAC Council), housed within the HHS Departmental Appeals Board (DAB), reviews ALJ decisions. Requests must be filed within 60 days of the ALJ decision. The Council may affirm, reverse, or remand the ALJ decision.

Level 5 — Federal District Court

Federal district court review is available after the Medicare Appeals Council issues a final decision. The AIC threshold for this level is $1,870 for 2024 (CMS). This is Article III judicial review and follows the Federal Rules of Civil Procedure.

Causal relationships or drivers

Claim denials triggering appeals arise from a defined set of administrative and clinical determinations:

• Medical necessity determinations — the most common denial basis; a contractor or plan concludes the service was not medically necessary under Medicare coverage rules
• Non-covered services — items or services explicitly excluded from Medicare coverage under statute or regulation (see what Medicare does not cover)
• Coding and billing errors — incorrect procedure codes, mismatched diagnosis codes, or coordination of benefits errors addressed through the Medicare claims and billing process
• Duplicate claim submissions — automated edits that flag identical or overlapping claims
• Prior authorization denials — particularly in Medicare Advantage, where plans require pre-approval for specified services
• Skilled care level disputes — disagreements about whether inpatient hospital or skilled nursing facility stays met the standard for covered skilled care

The volume of ALJ hearings fluctuates with enforcement and audit activity. When CMS-contracted Recovery Audit Contractors (RACs) increase post-payment audits, the downstream appeal volume at OMHA rises, creating processing backlogs that have historically extended decision timeframes well beyond the statutory 90-day target (HHS Office of Inspector General, OEI-02-17-00310).

Classification boundaries

The appeals pathway differs materially based on the type of Medicare coverage involved:

Original Medicare (Parts A and B): The five-level pathway described above applies. The MAC, QIC, ALJ, Appeals Council, and federal court sequence is mandatory; levels cannot be skipped.

Medicare Advantage (Part C): Plans must follow CMS-approved appeals procedures. The Level 1 equivalent is an "organization determination" review by the plan itself, followed by IRE reconsideration (not QIC), then ALJ, Appeals Council, and federal court. Expedited appeals — with 72-hour decision timelines — are available for urgent medical situations (42 C.F.R. § 422.570).

Part D (Prescription Drugs): The Part D appeals process begins with a coverage determination by the plan, followed by a redetermination by the plan, IRE reconsideration, ALJ hearing, Appeals Council review, and federal court. Expedited redeterminations must be resolved within 72 hours for urgent requests (42 C.F.R. § 423.584).

Medicare Secondary Payer (MSP) disputes follow a separate administrative track governed by 42 C.F.R. Part 411, relevant when Medicare coordination with employer or liability insurance is in question (see Medicare as secondary payer).

Tradeoffs and tensions

Speed versus thoroughness

The five-level structure prioritizes exhaustion of administrative remedies before judicial review. This protects the administrative record and allows technical correction at lower levels, but introduces cumulative delay. OMHA reported average ALJ decision times of approximately 31.4 months for fiscal year 2022 (OMHA Adjudication Statistics, FY 2022), far exceeding the 90-day statutory target — a tension that Congress has addressed through workload consolidation pilots without fully resolving.

Expedited versus standard appeals

Expedited appeals are available when standard timing would seriously jeopardize health or life, but invoking the expedited pathway shifts the burden to demonstrating urgency — and an unfavorable urgency determination itself can be appealed, adding a procedural layer.

Beneficiary versus provider standing

Both beneficiaries and providers may file appeals, but their standing differs. Providers who "accept assignment" may appeal on behalf of beneficiaries, while non-participating providers face different procedural rights. This creates asymmetries in who bears the cost and complexity of pursuing higher-level appeals.

Amount-in-controversy thresholds as access barriers

The AIC thresholds required to access ALJ hearings and federal district court review effectively screen out low-dollar disputes from higher-level adjudication. For individual beneficiaries disputing a single service, the $180 ALJ threshold is often reachable, but the $1,870 federal court threshold is a practical barrier for all but the most significant claims.

Common misconceptions

Misconception: An Explanation of Benefits (EOB) is itself an appealable determination.
An EOB is a summary document explaining what Medicare paid. The appealable document is the Medicare Summary Notice (MSN) for Original Medicare or the Remittance Advice for providers. The MSN includes specific language about appeal rights and deadlines.

Misconception: The 120-day filing window for a redetermination is strict and cannot be extended.
The 120-day period can be extended "for good cause" under 42 C.F.R. § 405.942(b). Documentation supporting good cause — such as a serious illness preventing timely filing — must accompany the late request.

Misconception: Providers cannot appeal Medicare determinations independently.
Providers have independent appeal rights for claims where they are the "assignee" of benefits or where they have financial liability. Non-participating providers also retain certain appeal rights under 42 C.F.R. § 405.906.

Misconception: Winning an appeal guarantees payment.
A favorable appeals decision establishes that a claim is covered and payable. Separate issues — such as billing errors, coordination with other payers, or unresolved provider enrollment problems — can still prevent or delay actual payment after a successful appeal.

Misconception: Medicare Advantage appeals follow the same process as Original Medicare.
The pathways differ at Levels 1 and 2 and involve plan-internal review and IRE reconsideration, not MAC redetermination and QIC reconsideration. Timelines, expedited rights, and the specific forms differ accordingly.

Checklist or steps (non-advisory)

The following sequence applies to Original Medicare (Parts A and B) fee-for-service appeals:

1. Obtain the initial determination document — the Medicare Summary Notice (for beneficiaries) or Remittance Advice (for providers) stating the denial reason and appeal rights
2. Identify the denial reason code — the specific remark code or claim adjustment reason code indicates the basis for denial and informs which evidence to gather
3. Determine the applicable deadline — 120 calendar days from receipt of initial determination for Level 1 redetermination (receipt presumed 5 days after date on notice)
4. Complete the Redetermination Request Form (CMS-20027) or submit a written request to the MAC that includes: beneficiary name, Medicare number, specific item or service in dispute, and the date(s) of service
5. Attach supporting documentation — medical records, physician statements, prior authorization documentation, or any evidence directly addressing the denial reason
6. Submit to the correct MAC — the MAC jurisdiction depends on the provider's location for Part B claims or the provider's enrollment for Part A claims
7. Track the 60-day response window — if the MAC does not respond within 60 days, the beneficiary may escalate to Level 2 without a written redetermination
8. If unfavorable, file a QIC Reconsideration Request (CMS-20033) within 180 days of the redetermination notice
9. If the AIC meets the threshold ($180 for 2024), file an ALJ hearing request (OMHA-100 form) within 60 days of the QIC decision — submit to OMHA, not to the MAC or QIC
10. If unfavorable at ALJ, request Medicare Appeals Council review within 60 days using the DAB's electronic filing system or written submission
11. If the AIC meets $1,870 and Council review is unfavorable or not completed within 90 days, file a civil action in federal district court within 60 days

For Medicare Advantage and Part D appeals, replace Steps 4–8 with the plan's internal organization determination and IRE reconsideration procedures per 42 C.F.R. Parts 422 and 423.

Reference table or matrix

Medicare Appeals: Five-Level Summary (Original Medicare, Parts A & B)

Part C and Part D Appeals: Key Structural Differences

All AIC thresholds cited are sourced from CMS Medicare Appeals Threshold Adjustments and are subject to annual inflation adjustment under 42 C.F.R. § 405.1006.

Beneficiaries seeking a broader orientation to Medicare program structure — including how Parts A, B, C, and D interact — can review the program overview before engaging the appeals process. The appeals process intersects with Medicare rights and protections, which establish the legal entitlement to appeal, and with Medicare fraud and abuse enforcement, since some denials arise from contractor audits related to suspected billing irregularities.