Medicare Medical Necessity Denial: How to Fight Back

"Not medically necessary" is the single most common reason Medicare denies claims. Whether it is a diagnostic test, procedure, therapy, hospital admission, or medical equipment, Medicare and Medicare Advantage plans frequently conclude that care does not meet the legal standard for coverage. But these denials are often wrong — and they are among the most frequently overturned on appeal.

What "Medical Necessity" Means Under Medicare

The Medicare statute defines covered services as those that are "reasonable and necessary for the diagnosis or treatment of illness or injury or to improve the functioning of a malformed body member" (42 U.S.C. § 1395y(a)(1)(A)).

Medicare's contractors and plans interpret this standard through:

National Coverage Determinations (NCDs): Policies issued by CMS specifying when certain services are covered nationally (e.g., bone density tests, cochlear implants, bariatric surgery).

Local Coverage Determinations (LCDs): Policies issued by Medicare Administrative Contractors (MACs) governing coverage decisions in their geographic regions. LCDs specify indications, diagnosis codes, and documentation requirements for hundreds of services.

Clinical judgment: When no NCD or LCD addresses a specific service, Medicare relies on its contractors' clinical judgment about whether care meets accepted medical standards.

The Jimmo v. Sebelius Standard

A critical legal clarification: the Jimmo v. Sebelius (2013) settlement established that Medicare coverage does not require a beneficiary to be improving. Coverage is required when skilled care is needed to maintain current function or prevent decline — even if no improvement is expected. This applies across home health, skilled nursing, and outpatient therapy.

Plans and contractors frequently ignore this standard, continuing to deny care as "custodial" or "maintenance." Citing Jimmo in these appeals is essential.

Common Services Denied as "Not Medically Necessary"

• Physical, occupational, or speech therapy
• Home health aide visits
• Skilled nursing facility stays
• Diagnostic imaging (MRI, CT, ultrasound)
• Specialty consultations
• Certain laboratory tests (ordered too frequently or without documented clinical indication)
• Outpatient procedures (surgery, injections, procedures)
• Durable medical equipment (wheelchairs, CPAP, orthotics)
• Inpatient hospital admissions

How Medicare Contractors Review Claims

Medicare does not review every claim in real time. Most claims are paid automatically based on the coding submitted. Post-payment, several audit programs review claims for medical necessity:

• Recovery Audit Contractors (RACs): Private firms paid a contingency fee to identify and recover overpayments. RACs frequently target high-cost services like inpatient admissions, chemotherapy, and DME.
• Zone Program Integrity Contractors (ZPICs): Investigate fraud, waste, and abuse; can suspend payments during investigation.
• MAC pre-payment review: Some MACs conduct prepayment audits on specific service types.

If you receive a retroactive denial from one of these programs, you have the same five-level appeal rights as with any other Medicare denial.

Building Your Medical Necessity Appeal

1. Get the Specific Denial Reason and Criteria

Your denial notice must cite the specific NCD, LCD, or clinical criteria used to deny the claim. Obtain this in writing and review the cited policy carefully — plans often misapply their own criteria.

2. Physician's Letter of Medical Necessity

This is the most important document in any medical necessity appeal. Ask your treating physician to write a detailed letter that:

• States your diagnosis with ICD-10 code
• Explains why the denied service was medically necessary for your specific condition
• Describes your clinical history leading to the decision to order/provide the service
• References applicable clinical guidelines (AMA, specialty society guidelines, peer-reviewed literature)
• Cites the Jimmo settlement if the denial was based on lack of improvement or "maintenance" care
• Explains why alternative, less intensive approaches would be clinically inappropriate

3. Review the Applicable LCD or NCD

Access Medicare's coverage databases at cms.gov (Coverage Center) or the MAC's website. If the service meets the LCD's indications but was still denied, document that discrepancy explicitly in your appeal.

4. Gather Supporting Documentation

• Complete medical records for the relevant treatment period
• Previous treatment history documenting why this service was the next appropriate step
• Diagnostic test results supporting the clinical picture
• Any peer-reviewed literature supporting the service for your condition
• Documentation of prior treatments tried and failed (if the denial cites step therapy)

5. Appeal Through the Five-Level Process

Level 1 — Redetermination: File within 120 days of the denial (Traditional Medicare) or 60 days (Medicare Advantage). The MAC or MA plan must respond within 60 days.

Level 2 — QIC Reconsideration: File within 180 days (Traditional) or 60 days (MA). The QIC responds within 60 days.

Level 3 — ALJ Hearing: File within 60 days. Amount in controversy must meet the minimum threshold.

Levels 4 and 5 — MAC and Federal Court: Continue escalating as warranted.

When the Denial Is a RAC Audit

If Medicare is seeking to recover a payment already made (a RAC audit demand), you still have full appeal rights. File your appeal promptly — do not wait to repay. Payment can be suspended while the appeal is pending.

Fight Back With ClaimBack

Medical necessity appeals require precise clinical and legal arguments. ClaimBack helps you identify the strongest arguments, organize your evidence, and draft a physician-backed appeal letter that directly addresses Medicare's denial reasoning.

Start your appeal with ClaimBack

Related Reading

• What Is Medical Necessity in Insurance?
• How to Write an Insurance Appeal Letter
• Common Reasons Insurance Claims Are Denied