PSG In Lab denied for missing prior authorization by Aetna?

Aetna's specific coverage criteria for psg in lab 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 In-Lab PSG

Aetna requires prior authorization (PA) for in-lab polysomnography as a utilization-management step — it wants to confirm that an attended lab study is clinically indicated before the service is rendered, rather than reviewing after the fact. Denials labeled "prior-auth required" after the service has already been performed are among the most common and most frequently overturned, because they are often administrative rather than clinical in nature.

If the study was ordered and performed without pre-authorization, the appeal argument centers on retrospective medical necessity: demonstrating that, had PA been sought, it would have been granted based on the clinical facts existing at the time of the order.

## Your Federal Appeal Rights

• Internal appeal: ACA §2719 and ERISA §503 entitle you to a full internal review. For a retrospective PA denial, the internal reviewer must evaluate whether the service was medically necessary — not simply whether a form was filed.
• External review: Independent external review is available after internal exhaustion, typically within approximately four months of the final internal denial.
• Expedited track: If your medical situation is urgent and requires a prompt decision on ongoing or follow-up care, request expedited review.

## Documentation to Gather

1. Prescriber order with clinical rationale — the original order from your physician should include the clinical basis for requesting an attended study. 2. Chart notes at time of order — document the presenting symptoms, relevant comorbidities, and any prior diagnostic workup that existed when the study was ordered. 3. Prior home sleep test results, if any — if a home study was previously done and was inconclusive or technically inadequate, include those results. 4. Physician medical-necessity letter — a retrospective letter confirming that the clinical indications met Aetna's PA criteria as of the date of service. 5. Aetna's PA criteria — obtain the clinical criteria Aetna uses for PSG authorization (available in its clinical policy bulletins) and map your chart facts to each requirement.

## Criteria-Mapping Structure

| Aetna PA Criterion | Evidence in Chart at Time of Service | |---|---| | [Paste each criterion from Aetna's policy] | [Quote chart note, date, and ordering clinician] |

## Next Step

If the PA was not obtained due to an administrative oversight by the ordering provider or facility, note this in the appeal and ask Aetna whether a peer-to-peer clinical review is available. Many retrospective PA denials are resolved through the peer-to-peer process without requiring a formal written appeal.