Cgm Dexcom denied as non-formulary by Aetna?

Aetna's specific coverage criteria for cgm dexcom 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 Your Dexcom CGM as Non-Formulary

A non-formulary denial means the Dexcom device or its associated supplies are not included on Aetna's preferred device/supply list for your specific plan. Formulary placement is a plan-design decision and does not mean CGM is not medically appropriate for you — it means Aetna has not pre-negotiated preferred pricing for this product on your benefit tier.

There are two parallel paths to pursue: a formulary exception (arguing medical necessity for the non-formulary item) and a standard internal appeal. Plans are generally required under ACA rules to grant a formulary exception when a covered alternative is not clinically appropriate for the enrollee or when a covered alternative has already failed.

## Your Federal Appeal Rights

• Formulary exception request: File simultaneously with or immediately before your internal appeal. Aetna must consider whether a clinically appropriate formulary alternative exists. If the formulary alternative is contraindicated, already tried and failed, or otherwise unsuitable, the exception should be granted.
• Internal appeal: File within the deadline on your denial notice. Standard decisions within 30 days; urgent/expedited within 72 hours.
• External review (ACA §2719 / ERISA §503): After a final internal denial, you may seek independent external review — typically within approximately four months. The IRO decision is binding.
• Expedited review: Available when delay poses a serious health risk.

## Documentation to Gather

1. Formulary alternative comparison: Ask Aetna which CGM device, if any, is on-formulary for your plan. Obtain documentation from your prescriber explaining why that alternative is not clinically appropriate for you. 2. Trial and failure records: If you previously used a formulary CGM and it did not meet your clinical needs, document dates of use, the specific inadequacy, and your prescriber's assessment. 3. Prescriber medical-necessity letter: A letter specifically requesting the formulary exception, explaining the distinct clinical features of the Dexcom system that your prescriber considers necessary for your care. 4. Diagnosis and treatment history: Standard documentation — chart notes, medication list, diagnosis codes — supporting CGM use generally. 5. Applicable guideline reference: Cite the relevant professional society (e.g., American Diabetes Association) to show that CGM use in your profile is guideline-supported.

## Criteria-Mapping Structure

Obtain Aetna's formulary exception criteria (available in your plan documents or from member services). Map each criterion directly to your documentation. If the exception form asks whether a formulary alternative is clinically appropriate, your prescriber's letter should answer that question in plain clinical terms referencing your specific chart findings.

Formulary exception appeals succeed most often when the prescriber letter is specific about why the non-formulary device is medically necessary rather than merely preferred. Pair it with complete chart documentation and submit before the deadline.