Medicare Mental Health Claim Denied: Appeal Guide

Mental health coverage under Medicare has expanded significantly over the past two decades, but denials remain common — often based on outdated assumptions about what Medicare covers or inappropriate application of coverage criteria. If your Medicare mental health claim was denied, you have strong appeal rights and a solid legal foundation to stand on.

What Medicare Mental Health Covers

Outpatient Mental Health (Part B) Medicare Part B covers a wide range of outpatient mental health services, including:

• Psychotherapy (individual, group, and family)
• Psychiatric evaluation and medication management
• Depression screening
• Substance use disorder counseling
• Crisis intervention services

After the ACA, Medicare eliminated the prior "50 percent coinsurance" rule for outpatient mental health services. Today, Medicare covers outpatient mental health at the same rate as other medical services — 80% after the Part B deductible, with 20% coinsurance. Crucially, there are no session limits for outpatient mental health under Medicare Part B. A plan that imposes session limits is violating Medicare parity rules.

Inpatient Psychiatric Care (Part A) Medicare Part A covers inpatient psychiatric hospital stays, but with an important limitation: Medicare covers a 190-day lifetime maximum of inpatient psychiatric care in freestanding psychiatric hospitals. This lifetime limit does not apply to psychiatric units within general hospitals.

This means if you have previously used a significant amount of inpatient psychiatric care in freestanding facilities, you may be approaching or have exceeded the 190-day limit. However, care in a general hospital's psychiatric unit is not subject to this cap.

Medicare Advantage and Mental Health Parity

Medicare Advantage plans must comply with the Mental Health Parity and Addiction Equity Act (MHPAEA), which requires that mental health and substance use disorder benefits be offered on terms no more restrictive than comparable medical and surgical benefits.

If your Medicare Advantage plan requires more Prior Authorization Denied: How to Appeal" class="auto-link">prior authorization steps for psychiatric care than for equivalent medical services, or imposes more stringent utilization management for mental health, that may be a parity violation. You can raise parity as a legal argument in your appeal and file a CMS complaint.

Common Denial Reasons for Mental Health Claims

• Medical necessity denial: The plan argues the level of care is not medically necessary (e.g., denying residential treatment when outpatient is available)
• Prior authorization not obtained: The plan required PA for an ongoing therapy relationship without proper notice
• Out-of-network provider: Mental health networks are frequently inadequate; see network adequacy rules below
• Level of care mismatch: The plan argues inpatient or intensive outpatient care is not warranted
• Non-covered provider type: The plan denies claims from certain licensed mental health professionals

Network Adequacy and Out-of-Network Exceptions

Mental health provider shortages make it especially difficult to find an in-network therapist or psychiatrist. CMS requires Medicare Advantage plans to maintain adequate networks of mental health providers. If in-network providers are unavailable with reasonable wait times or within reasonable geographic distance, the plan must provide out-of-network care at in-network cost-sharing.

If you sought out-of-network mental health care because in-network providers were unavailable, document your attempts to find in-network care (call logs, provider directories showing no availability) and include this in your appeal.

The 5-Level Medicare Appeal Process for Mental Health

Level 1 — Redetermination by the plan (MA) or MAC (Original Medicare): File within 60 days (MA) or 120 days (Original Medicare).

Level 2 — Reconsideration by IRE/QIC: File within 60 days of the redetermination. The independent reviewer applies Medicare coverage criteria without deference to the plan.

Level 3 — ALJ Hearing at OMHA: File within 60 days. Amount in controversy threshold applies.

Level 4 — Medicare Appeals Council: File within 60 days of ALJ decision.

Level 5 — Federal District Court: For qualifying disputes.

What to Include in Your Appeal

• Clinical notes from your treating mental health professional documenting diagnosis, treatment plan, and progress
• A letter from your psychiatrist or therapist explaining why the level of care provided was medically necessary
• Documentation of prior treatment attempts (for step therapy disputes)
• Evidence of mental health parity violations if applicable
• Documentation of failed attempts to find in-network providers for out-of-network cases

Substance Use Disorder Coverage

Medicare covers substance use disorder treatment, including opioid treatment programs (OTPs) under a bundled payment system. Medication-assisted treatment (MAT) with methadone or buprenorphine is covered. If your substance use disorder treatment was denied, these specific Medicare coverage rules apply and should be cited in your appeal.

Get Free Help

SHIP counselors (shiphelp.org) can help you navigate mental health denials, especially for Medicare Advantage plans where parity issues are most common. Call 1-800-MEDICARE to start.

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Related Reading:

• How to Write an Insurance Appeal Letter
• What Is Medical Necessity?
• Internal vs External Insurance Appeal