Hyperbaric Oxygen denied for missing prior authorization by Aetna?

Aetna's specific coverage criteria for hyperbaric oxygen are defined in its own published medical/coverage policy and the FDA-approved prescribing label. A successful appeal documents that your medical records satisfy each criterion those sources list — confirmed diagnosis, any required prior treatments (with dates and outcomes), and clinical severity. If the exact criteria weren't included with your denial, request them in writing; your appeal then maps each requirement to the matching fact in your chart.

## Why Aetna Requires Prior Authorization for Hyperbaric Oxygen — and How to Appeal a Denial

Aetna requires prior authorization (PA) for hyperbaric oxygen therapy (HBOT) because it is a resource-intensive treatment with a specific list of covered indications and qualifying criteria. A PA denial does not mean HBOT is inappropriate for you — it means the authorization request did not contain the information Aetna's reviewers needed to confirm that each criterion in their clinical policy is satisfied.

The good news: PA denials for HBOT are among the most reversible denial types when a complete, well-documented appeal is submitted. The clinical evidence for HBOT in its cleared indications is well-established, and your prescribing physician is usually the key to building a winning record.

## Your Federal Appeal Rights

• Internal appeal: ERISA §503 and ACA §2719 require Aetna to provide a full-and-fair internal review. File within the timeframe on your denial letter (commonly 180 days from the denial date).
• External review: After exhausting internal appeals, ACA §2719 entitles most plan members to review by an Independent Review Organization (IRO). You generally have four months (180 days) from the final adverse determination to initiate external review.
• Expedited review: If the urgency of your condition means waiting for a standard review would cause serious harm — for example, an acute non-healing wound with signs of infection — request expedited internal and external review simultaneously. Aetna must respond to an expedited internal appeal within 72 hours.

## Documentation to Gather

1. Diagnosis confirmation — complete chart documentation of the specific diagnosis with ICD-10 code, including relevant clinical workup (wound assessment, vascular study results, imaging, biopsy, or specialty evaluation) that establishes the diagnosis and its severity. 2. Prior treatment failure documentation — a chronological record of all treatments attempted before HBOT was recommended, including dates, agents or interventions used, and the clinical outcome of each. Aetna's policy typically requires documentation of inadequate response to standard care. 3. Prescriber medical-necessity letter — a detailed letter from the referring and/or hyperbaric physician addressing each criterion in Aetna's HBOT PA criteria, confirming the diagnosis, prior treatment history, and clinical rationale for HBOT. 4. Treatment plan — a proposed treatment plan specifying the number of sessions planned and the clinical goals, which helps Aetna's reviewer understand the scope of the requested authorization. 5. Aetna's PA criteria — request the exact prior authorization criteria from Aetna's current HBOT clinical policy so your appeal can address every listed requirement.

## Criteria-Mapping Structure

Mirror Aetna's PA criteria in your appeal letter: list each requirement verbatim, then cite the specific chart evidence that satisfies it. For example: "Criterion: [per Aetna policy] — Met: wound care note dated [date] confirms [prior intervention] attempted with [documented outcome]; prescriber letter dated [date] confirms [diagnosis and severity]." This one-to-one mapping is the most effective way to convert a PA denial into an approval and, if external review is needed, gives the IRO a clear record to work from.