Aetna prior authorization denials are rarely about medical necessity on the merits — they're almost always about incomplete documentation. The clinical criteria exist, and in most cases your patient qualifies. The question is whether you've submitted what Aetna actually needs to make that determination on the first pass.
What Aetna Is Actually Evaluating
Aetna uses a combination of its own clinical policy bulletins (CPBs) and InterQual criteria for most PA decisions. When a reviewer opens your request, they're looking for specific elements that map to the CPB for that service. Generic clinical notes don't cut it. You need documentation that directly addresses the criteria in the applicable policy.
The Core Documentation Checklist
For most services requiring PA, Aetna expects the following at minimum:
- Clinical notes from the ordering provider — dated within 90 days, specific to the condition, including relevant history and current symptoms
- Conservative treatment history — documentation that first-line treatments were tried and failed (or are contraindicated)
- Diagnostic test results — labs, imaging, or functional assessments relevant to the service requested
- ICD-10 diagnosis codes — must be specific, not unspecified, and must match the documentation
- CPT/HCPCS codes requested — with units and expected duration
- Ordering provider NPI and DEA number (for medications requiring PA)
Drug Prior Authorizations: Additional Layer
Pharmacy PAs through Aetna require step therapy documentation — proof that preferred/generic alternatives were tried first. For specialty medications like biologics or infusion drugs, Aetna also typically requires a Letter of Medical Necessity (LMN) from the treating physician that specifically addresses why the requested agent is medically necessary over alternatives. The LMN needs to reference the patient's diagnosis, failed prior therapies, and the clinical rationale for the specific drug.
Behavioral Health PA Requirements
Behavioral health services have their own documentation requirements. Aetna generally requires a current DSM-5 diagnosis, a treatment plan, and evidence of outpatient treatment failure before approving higher levels of care. For continuing care authorizations, submit updated clinical notes showing treatment response and continued medical necessity — don't resubmit the initial intake paperwork.
How to Submit for Fastest Turnaround
Aetna's Availity portal allows electronic PA submission with document attachments. Use it. Fax submissions go into a queue that can add 2–3 business days to your turnaround. When submitting electronically, attach documents in a single PDF when possible — multiple uploads on the same request can occasionally create processing delays.
When You Get a Pended Request
A pended status means Aetna needs more information before making a determination. You'll typically have 14 days to respond with additional documentation before the request is closed. Watch for the pend reason carefully — it tells you exactly what's missing. Address that specific gap, not everything you have on file.
Appeals for PA Denials
If Aetna denies a PA, you have the right to a peer-to-peer review with the clinical reviewer — typically within 14 days of the denial. This is the most effective tool in your arsenal. Get the ordering physician on the phone with Aetna's medical director. Approval rates on peer-to-peer reviews are significantly higher than written appeal rates when the physician directly addresses the denial rationale.
Bottom Line
Aetna PA approvals come down to documentation precision. Know the applicable clinical policy bulletin before you submit. Match your documentation to its criteria. Submit electronically. And use peer-to-peer review aggressively when you get denied — that's what it's there for.