Mavacamten HCM denied as not medically necessary by Aetna?

Aetna's specific coverage criteria for mavacamten hcm 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 Denies Mavacamten on Medical-Necessity Grounds — and Why You Can Appeal

Mavacamten is a cardiac myosin inhibitor approved for symptomatic obstructive hypertrophic cardiomyopathy (oHCM). Medical-necessity denials for mavacamten typically occur because Aetna's clinical criteria require documented evidence of: the confirmed oHCM diagnosis, a defined level of symptomatic burden, prior use of standard guideline-directed therapies, and specific echocardiographic or hemodynamic findings. If any one of these documentation elements is missing or ambiguous in the submitted records, the claim is denied — not necessarily because the patient doesn't qualify, but because the file does not clearly demonstrate it.

## Why Medical-Necessity Denials Are Appealable

Medical-necessity determinations are clinical judgments, not just administrative checkboxes. If the treating cardiologist or HCM specialist believes the patient meets all applicable criteria, a well-documented appeal that maps the medical record point-by-point to each criterion Aetna cited will frequently succeed. The key is obtaining the exact denial rationale and the exact criteria applied, then addressing each one with specific chart evidence.

## Federal Appeal Framework

• Internal appeal: Submit within the window stated in your denial notice. Request Aetna's complete clinical criteria for mavacamten in writing as part of the appeal.
• External review (ACA §2719): Available after exhausting internal remedies, generally within four months of the final denial, for most non-grandfathered plan members. An independent clinician reviewer — not Aetna — makes the determination.
• ERISA §503: Employer-plan members are entitled to a full-and-fair review, including the right to review all documents Aetna relied on in denying the claim.
• Expedited review: Request if symptom severity or disease progression creates urgency; insurers must respond within 72 hours.

## Documentation to Gather

• Confirmed oHCM diagnosis: Echocardiographic reports, relevant imaging, and specialist notes confirming obstructive phenotype and symptom status.
• Symptomatic burden documentation: Chart notes documenting functional class, exertional symptoms, and their impact on daily activity.
• Prior therapy history: Records of all previously tried guideline-directed medications for oHCM — with start and stop dates, doses (per the prescribing label), and documented response or reason for discontinuation.
• Prescriber medical-necessity letter: A detailed letter from the treating HCM specialist that directly addresses each of Aetna's stated criteria, confirms the patient meets the FDA-approved indication, and references applicable cardiology society guidelines.
• Objective clinical data: Any relevant hemodynamic, imaging, or functional test results that document disease severity and response to prior therapy.

## Criteria-Mapping Structure

Obtain Aetna's published clinical policy for mavacamten. Build a two-column table:

| Aetna Clinical Criterion | Supporting Chart Evidence | |---|---| | Confirmed diagnosis of symptomatic oHCM | [Echocardiogram date, report summary, ICD code] | | Symptomatic burden (functional class) | [Specialist note date, functional description] | | Prior therapy trial(s) and outcomes | [Drug names, dates, outcomes per chart] | | Prescriber is appropriate specialist | [Cardiologist / HCM center credentials] |

Submit this table as an exhibit with the appeal letter so the reviewer can match every criterion to evidence without having to search the record.