When to Appeal vs. When to Resubmit

Before writing an appeal, determine whether the denial requires an appeal or a corrected claim:

  • Corrected claim: Use when the denial was due to a billing error (wrong modifier, wrong diagnosis code, wrong place of service). Do not file an appeal for billing errors — file a corrected claim.
  • Appeal: Use when the denial was due to a clinical determination (not medically necessary, experimental, exceeds frequency limits) or when you believe the payor made an error in applying their own policy.

    • The Four Types of ABA Appeals

    1. Prior Authorization Denial Appeal

    The payor denied the initial authorization request. This is the most common type of ABA appeal.

    2. Concurrent Review Denial Appeal

    The payor denied a renewal authorization request, typically citing lack of progress or medical necessity.

    3. Claim Denial Appeal

    The claim was denied after services were rendered, typically for medical necessity or authorization-related reasons.

    4. Retrospective Authorization Appeal

    Services were rendered without authorization (or with expired authorization) and you are requesting retroactive coverage.

    The Medical Necessity Letter Framework

    An effective medical necessity appeal letter has five components:

    Component 1: Clinical Summary (1 paragraph)

    Briefly describe the client's diagnosis, current functional level, and the specific behaviors being targeted. Use objective, measurable language.

    Example: "The patient is a 6-year-old male with a diagnosis of Autism Spectrum Disorder, Level 2 (F84.0), confirmed by [Evaluator Name, Credentials] on [Date]. Current standardized assessments indicate significant deficits in adaptive behavior (Vineland-3 Adaptive Behavior Composite: 62, 1st percentile) and communication (VABS Communication Domain: 58, 0.3rd percentile). Target behaviors include self-injurious behavior (head-banging, averaging 45 incidents per week at baseline), elopement (3–5 incidents per week), and absence of functional communication."

    Component 2: Treatment Justification (2–3 paragraphs)

    Explain why ABA is the appropriate treatment at the requested intensity level. Reference the payor's own clinical policy criteria.

    Example: "Applied Behavior Analysis is the only intervention with Level 1 evidence for improving outcomes in autism spectrum disorder (National Autism Center, 2015; USDHHS, 2017). The requested 30 hours per week of ABA services is consistent with [Payor Name]'s Clinical Policy Bulletin [Number], which specifies that intensive ABA (20–40 hours per week) is medically necessary when the patient presents with severe behavioral challenges that pose a risk of harm to self or others."

    Component 3: Progress Documentation (for renewal appeals)

    For concurrent review denials, document measurable progress toward treatment goals.

    Example: "Since initiating ABA services on [Date], the patient has demonstrated the following measurable progress: (1) Self-injurious behavior has decreased from 45 incidents per week to 12 incidents per week (73% reduction); (2) The patient has acquired 8 of 12 targeted functional communication responses; (3) Elopement incidents have decreased from 4 per week to 0.5 per week."

    Component 4: Consequences of Denial (1 paragraph)

    Explain what will happen if the authorization is not approved. Be specific and clinical.

    Example: "Without continued ABA services at the requested intensity, the patient's self-injurious behavior is likely to return to baseline levels, creating a significant risk of physical harm. The patient's recent progress in functional communication — the primary protective factor against self-injury — is directly dependent on the consistency of ABA intervention. A reduction in services at this stage of treatment would likely result in regression of all acquired skills."

    Component 5: Supporting Documentation List

    List all documents included with the appeal:

  • Functional Behavior Assessment
  • Treatment plan with progress data
  • Session notes from the past 30–60 days
  • Diagnostic evaluation
  • Letter from supervising physician or psychologist (if available)
  • Relevant research citations

    • Appeal Submission Tips

    Submit within the deadline. Most payors have a 30–180 day window for filing appeals. Missing the deadline forfeits your appeal rights.

    Request an expedited appeal when appropriate. If the denial creates an urgent clinical situation (e.g., a client with active self-injurious behavior losing coverage), request an expedited review. Most payors must respond within 72 hours.

    Request a peer-to-peer review. Many payors allow the treating BCBA to speak directly with the payor's medical reviewer. This is often the most effective way to overturn a medical necessity denial.

    Document everything. Keep records of all appeal submissions, confirmation numbers, and payor responses. If you need to escalate to an external review, this documentation is essential.

    Know your external review rights. If an internal appeal is denied, you have the right to request an independent external review in most states. The external reviewer's decision is binding on the payor.