Dexa Scan denied for missing prior authorization by Medicare?

Medicare's specific coverage criteria for dexa scan 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 Medicare Denies a DEXA Scan for Prior Authorization

Traditional Medicare Part B generally does not require prior authorization for DEXA bone density scans. When a prior-authorization denial appears, it almost always means one of the following: (1) the patient is enrolled in a Medicare Advantage plan, which may impose prior-authorization requirements that traditional Medicare does not; (2) a non-participating or out-of-network facility was used and the plan's network rules triggered a PA requirement; or (3) a billing or routing error caused the claim to process under the wrong benefit segment. Identifying which scenario applies is the first step in the appeal.

## Why This Denial Is Appealable

If the authorization requirement was not adequately disclosed to the patient at the time of scheduling, or if the ordering provider reasonably believed authorization was not required, the appeal can succeed on equity and notice grounds in addition to clinical grounds. Medicare Advantage plans are also subject to federal rules limiting the use of prior authorization — CMS has issued guidance specifically restricting PA use for services with strong coverage evidence — and an improper PA requirement is itself appealable.

## Federal Appeal Framework

• Medicare Advantage plans must follow CMS prior-authorization rules and provide internal appeal rights.
• Internal appeal deadlines: typically 60 days for standard post-service appeals, 72 hours for pre-service expedited appeals.
• If the internal appeal is denied, ACA §2719 external review by a CMS-contracted Independent Review Organization is available — generally within four months of the internal denial.
• For traditional Medicare Part B claims routed incorrectly to a PA requirement, file a Redetermination within 120 days.

## Concrete Appeal Steps

1. Confirm whether the patient has traditional Medicare or Medicare Advantage, and identify the specific plan. 2. Obtain the plan's Evidence of Coverage or Summary of Benefits and locate the prior-authorization requirement for bone density studies. 3. Determine whether authorization was sought, whether the ordering provider received adequate notice of the requirement, and whether any urgency exception applies. 4. If authorization was not obtained, submit a retrospective authorization request simultaneously with the appeal, supported by medical-necessity documentation. 5. If the PA requirement itself is improper under CMS rules, cite the applicable CMS guidance in the appeal.

## Documentation Checklist

• Denial notice specifying the PA requirement and the date of service
• Plan's Evidence of Coverage or Summary of Benefits showing the PA policy
• Ordering provider's medical-necessity letter with clinical rationale
• Clinical notes documenting the indication for the scan
• Any communications between the ordering provider and the plan regarding authorization
• Applicable NCD/LCD confirming coverage for the clinical indication

## Criteria-Mapping Structure

Address the appeal on two tracks. First, the procedural track: demonstrate either that authorization was properly sought, that the requirement was not clearly disclosed, or that the requirement exceeds CMS-permitted PA use. Second, the clinical track: map each coverage criterion from the applicable NCD/LCD or plan policy to the corresponding chart documentation. Winning on either track should result in coverage.