How to Appeal a Level-of-Care Denial: Step-by-Step Guide

Level-of-care denials are among the most frustrating types of insurance denials. Unlike a flat denial, a level-of-care denial means the insurer agrees you need treatment but says it should happen at a lower — and cheaper — setting. The insurer approves outpatient when your doctor recommends inpatient, approves intensive outpatient when your doctor recommends residential, or approves observation status when your doctor recommends full hospital admission. These denials are especially common in mental health, substance abuse treatment, surgical recovery, and rehabilitation — areas where the difference between levels of care can determine whether a patient recovers or deteriorates.

Why Insurers Issue Level-of-Care Denials

Insurers use standardized utilization review criteria — most commonly InterQual (from Change Healthcare) or Milliman Care Guidelines — to assess the appropriate level of care for a given diagnosis. A utilization reviewer applies these criteria to your medical records and determines whether the requested level is justified. Level-of-care denials occur when clinical information submitted does not meet the criteria for the higher level, when the reviewer interprets your condition as less severe than your treating physician does, when key clinical details were missing from the authorization request, or when the insurer's criteria are more restrictive than current clinical standards. For mental health and substance use disorder treatment, the Mental Health Parity and Addiction Equity Act (MHPAEA, 29 U.S.C. Section 1185a) prohibits applying level-of-care criteria more restrictively than would be applied to comparable medical or surgical conditions.

How to Appeal a Level-of-Care Denial

Step 1: Request the Specific Criteria Used

Before you can argue you meet the criteria for the higher level of care, you must know what those criteria are. Under ACA Section 2719 and 45 C.F.R. Section 147.136, you are entitled to the specific clinical criteria applied in the denial. Call your insurer and request the name and version of the criteria (InterQual, Milliman, or proprietary), the specific criteria for the level you requested, the criteria for the lower level approved, and the reviewer's rationale for concluding you did not meet the higher criteria. Write down the reference number, date, and name of each person you speak with.

Step 2: Document Clinical Necessity for the Higher Level

Your treating physician is essential to this appeal. Have them write a detailed letter that addresses the insurer's criteria point by point, explains the specific medical risks of treatment at the lower level of care (risk of self-harm or relapse for mental health, risk of complications for surgical recovery, risk of functional decline for rehabilitation), documents clinical complexity including comorbidities and prior treatment failures at the lower level, and cites specialty guidelines that support the requested level for patients with your clinical profile.

Step 3: Invoke MHPAEA If Mental Health or Substance Use Is Involved

MHPAEA (29 U.S.C. Section 1185a) and its implementing regulations (29 C.F.R. Section 2590.712) require that non-quantitative treatment limitations — including level-of-care criteria — applied to mental health and substance use disorder treatment be comparable to and no more stringent than those applied to analogous medical or surgical conditions. Ask the insurer to demonstrate that the same type of criteria is applied with the same stringency to comparable medical level-of-care decisions. Under the Consolidated Appropriations Act of 2021 (amending 29 U.S.C. Section 1185a(a)(8)), you have the right to request the insurer's comparative analysis documenting MHPAEA compliance. Cite this right explicitly in your appeal.

Step 4: Request a Peer-to-Peer Review

A peer-to-peer review — a direct call between your treating physician and the insurer's medical reviewer — is particularly effective for level-of-care denials. Your physician can explain clinical nuances that written records alone cannot convey. During the call, your doctor should ask the reviewer to identify which specific criteria are not met, present clinical evidence addressing each unmet criterion, describe the risks of the lower level for this specific patient, and ask about the reviewer's specialty. If the insurer's reviewer is not board-certified in the same specialty as your treating physician, note this in your appeal — clinical peer review should be conducted by a physician with relevant expertise.

Step 5: Write Your Appeal Letter

Open by stating you are appealing the level-of-care determination — not the need for treatment itself. Identify the authorization reference number, member ID, dates of service, and the specific level requested versus approved. Present your clinical situation with objective measurements: vitals, mental status findings, functional assessments, lab values, or validated scores (ASAM criteria for substance use, LOCUS for mental health, Barthel Index for rehabilitation). Address each criterion for the requested level with specific documentation. Document prior treatment failure at the lower level, if applicable. For mental health or substance use denials, state the MHPAEA parity argument and request that the insurer demonstrate comparable criteria are applied to medical or surgical cases.

Step 6: Escalate to External Independent Review: Complete Guide" class="auto-link">External Review and Regulatory Complaints

If the internal appeal is denied, request external review. An independent reviewer — typically a physician in the relevant specialty — evaluates whether the level of care meets medical necessity criteria and is not constrained by the insurer's internal criteria. For mental health and substance use denials, simultaneously file a MHPAEA violation complaint with the Department of Labor at askebsa.dol.gov (for ERISA plans) or with your state Department of Insurance (for individual and marketplace plans). If you are currently receiving treatment at the higher level, request continuation of care during the appeal — some states mandate this.

What to Include in Your Appeal

• Insurer's level-of-care criteria with your physician's point-by-point analysis of how you meet each criterion
• Physician letter documenting clinical complexity, comorbidities, and prior treatment failure at the lower level
• Objective clinical measurements (ASAM criteria, LOCUS, Barthel Index, mental status findings, functional scores)
• MHPAEA comparative analysis request (Consolidated Appropriations Act of 2021 language) if mental health or substance use is involved
• Specialty society guidelines supporting the requested level for patients with your clinical profile

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Related Reading

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