Hyperbaric Oxygen denied as not medically necessary 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 Denied Hyperbaric Oxygen as "Not Medically Necessary" — and How to Appeal

Aetna's medical necessity denials for hyperbaric oxygen therapy (HBOT) almost always come down to insufficient clinical documentation. Aetna maintains a detailed clinical policy listing the conditions and clinical circumstances under which HBOT is considered medically necessary. If the submitted record did not clearly demonstrate that every criterion in that policy is met — the right diagnosis, documented failure of standard wound care or other prior treatments, appropriate staging or severity, and wound-care center involvement — the claim will be denied.

This denial is highly appealable when you can build a complete, criterion-by-criterion response using your actual chart documentation.

## Your Federal Appeal Rights

• Internal appeal: Under ERISA §503 and ACA §2719, Aetna must provide a full-and-fair internal review. Submit your appeal within the timeframe on your denial letter (typically 180 days from the denial date).
• External review: If the internal appeal is upheld, ACA §2719 entitles most members to review by an Independent Review Organization (IRO). You generally have four months (180 days) from the final adverse determination. External review is particularly effective for medical necessity denials because the IRO applies objective clinical evidence standards rather than solely deferring to Aetna's policy.
• Expedited review: Available when delay would risk serious harm — for example, an infected wound with threatened limb loss. Aetna must respond to an expedited internal appeal within 72 hours.

## Documentation to Gather

1. Diagnosis confirmation — chart notes, wound assessment records, or specialist evaluation documenting the confirmed diagnosis (e.g., non-healing diabetic foot wound, radiation injury) with ICD-10 coding aligned to Aetna's covered indications. 2. Prior treatment failure — a dated, chronological record of all standard wound care, antibiotic courses, surgical debridements, or other treatments tried before HBOT was recommended, with documented outcomes for each. 3. Clinical severity indicators — objective documentation of wound characteristics, depth, duration of non-healing, vascular studies, or other severity markers relevant to your condition. 4. Wound care program involvement — evidence that HBOT is being delivered or supervised within a structured wound care program, if Aetna's policy requires it. 5. Prescriber medical-necessity letter — a detailed letter from the treating hyperbaric physician addressing each criterion in Aetna's clinical policy and explaining why HBOT is the clinically appropriate next step. 6. Aetna's HBOT clinical policy — request the exact version used in your denial so your appeal addresses every listed criterion.

## Criteria-Mapping Structure

List each of Aetna's medical necessity criteria verbatim, then cite the specific chart fact that satisfies it: "Criterion: [per Aetna policy] — Met: wound assessment dated [date] documents [characteristic]; wound care note dated [date] confirms [prior treatment] was completed with [outcome]." This format is the single most effective way to convert a medical necessity denial into an approval.