Cgm Dexcom denied as not medically necessary 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 Not Medically Necessary

A medical-necessity denial from Aetna means the plan reviewed your prior-authorization request and concluded that the clinical information submitted did not satisfy every criterion in Aetna's CGM coverage policy for your particular situation. This is the most common denial type for Dexcom CGM and is routinely overturned when the appeal includes complete, well-organized clinical documentation.

Medical-necessity criteria for CGM typically focus on diagnosis type, current treatment regimen, and clinical indicators that make real-time glucose trending relevant to your management. If your submission was missing any piece — a note about your insulin regimen, frequency of hypoglycemic episodes, or your prescriber's explicit statement linking CGM to your care plan — the denial may have nothing to do with whether CGM is truly appropriate for you.

## Your Federal Appeal Rights

• Internal appeal: You must file within the timeframe stated on your denial notice. Aetna must decide within 30 days for standard requests or 72 hours for urgent/expedited appeals.
• External review (ACA §2719 / ERISA §503): If Aetna upholds its denial internally, you are entitled to independent external review — generally available for roughly four months from the final internal decision. The IRO's decision is binding on Aetna.
• Expedited review: If your condition is urgent, request expedited status in writing when you file.

## Documentation to Gather

1. Diagnosis confirmation: Chart notes, lab results, and ICD codes confirming your diabetes diagnosis and type. 2. Current treatment regimen: A complete medication list or prescriber summary showing your current insulin or non-insulin diabetes therapy, including start dates. 3. Clinical severity indicators: Office visit notes documenting any hypoglycemic episodes, glucose variability, A1c trends, or other clinical findings your prescriber considers relevant. 4. Prior monitoring history: Records of prior fingerstick testing, any prior CGM use, and outcomes or limitations encountered. 5. Prescriber medical-necessity letter: A letter — not a form — in which your prescriber explains in their own clinical language why CGM is necessary for your management and what specific clinical goals it serves. 6. Applicable guideline reference: Your prescriber should note the relevant professional society guideline organization (e.g., American Diabetes Association) that supports CGM in a patient with your profile.

## Criteria-Mapping Structure

Download Aetna's current CGM medical policy from Aetna's website or request it by name from member services. List every coverage criterion verbatim. For each one, write a one-sentence response citing the exact chart evidence (note date, lab date, medication list entry) that satisfies it. Attach that mapping as a cover page to your appeal. Medical reviewers work faster and more favorably when the documentation directly answers every policy question.

Medical-necessity appeals with complete documentation succeed at a high rate. Do not delay — the appeal deadline is firm.