Is This Denial Appealable?
Not all denials should be appealed. Start by identifying the reason code:
- Appeal-worthy: Medical necessity (CARC 50, 51), timely filing with proof (CARC 29), authorization issues where auth exists (CARC 4, 197), coding/modifier errors
- Write off: Contractual adjustments (CARC 45, CO group), expired timely filing with no proof
- Bill patient: Non-covered services (PR group), deductibles, copays
Step 1 — Gather Supporting Documentation
Before writing the appeal, collect:
- Copy of the Explanation of Benefits (EOB) or ERA with the denial reason
- The original claim (CMS-1500 or 837P)
- Prior authorization documentation
- Behavioral intervention plan (BIP)
- Progress notes for the service date(s) in question
- Diagnostic records supporting medical necessity
- Clinical practice guidelines (BACB, ABAI) supporting ABA for autism
Step 2 — Meet the Appeal Deadline
Most payers allow 60–180 days from the denial date to file an appeal. Check the payer's appeal policy carefully — missing the deadline typically waives your appeal rights. Track all denial dates in your practice management system.
Step 3 — Write the Appeal Letter
A strong ABA appeal letter includes:
- Patient name, date of birth, member ID, claim number, date of service
- Clear statement: "We are appealing the denial of claim [#] for [code] on [date]"
- The denial reason code and the payer's stated reason
- Your clinical argument refuting the denial (cite the BIP, DSM-5 diagnosis, state mandate for ABA coverage)
- Reference to any applicable state law (many states have autism insurance mandates)
- List of all attached documentation
- Contact information for follow-up
Step 4 — Submit and Track
Submit via certified mail (for paper) or through the payer's portal (recommended for tracking). Note the submission date and receipt confirmation. Set a follow-up reminder for 30 days.
Step 5 — Escalate If Needed
- Level 1 Appeal: Internal review by payer
- Level 2 Appeal: External/independent review (required by ACA for certain denial types)
- State Insurance Commissioner: File a complaint if the payer violates state autism insurance mandate
- Legal options: For large amounts, consult a healthcare attorney about ERISA remedies
Pro Tips
- Always cite the payer's own clinical policy criteria in the appeal — show that you meet their published standards
- For "medical necessity" denials, include peer-reviewed literature (JABA, Behavior Analysis in Practice) supporting ABA efficacy
- Keep a template for common denial types to improve efficiency
- Track appeal outcomes to identify systemic payer issues
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