Aetna Plan Coverage Policies
Aetna Plan Coverage Policies: Overview
Aetna's coverage decisions follow medical necessity standards tied to published policy guidelines. The carrier denies 22% of claims (KFF 2024), primarily for lack of medical necessity, non-covered services, or billing discrepancies. Pre-service authorizations return decisions in 15 days; post-service claims resolve within 30 days. Network filing deadlines: 90 days from service for in-network providers, 180 days for out-of-network. Aetna uses Availity for provider access to eligibility, authorization requests, and claim tracking.
Key Requirements
- Medical Necessity Documentation: Clinical evidence supporting diagnosis, treatment plan, and clinical outcomes. Aetna compares requests against evidence-based guidelines and medical literature.
- Authorization Before Service: Elective procedures require pre-approval. Submit authorizations 15+ days before treatment with procedure code, clinical justification, and supporting records.
- Correct Coding: Use current CPT/ICD-10 codes. Unbundling, incorrect modifiers, or component billing trigger denials (CO-45, CO-50).
- Network Status Verification: Confirm provider contract with Aetna. Non-contracted providers face claim delays and higher denials.
- Member Eligibility: Verify coverage active on service date. Check member ID, plan type, and coverage effective date via Availity or phone.
- Timely Filing: Network: 90 days from DOS. Out-of-network: 180 days. Late claims are not reviewed.
Timeline & Process
Pre-Service (Planned Treatment): Submit authorization 15+ days before service. Aetna reviews within 15 days and issues approval letter or denial with reason code. Emergency requests (24-hour turnaround) require verbal notification.
Post-Service (Claims): File within 90 days (network) or 180 days (OON). Aetna processes claims within 30 days of receipt. Denials include CARC code and explanation.
Appeal Timeline: 180 days from denial date to file first appeal. Second level review: 60 days. Expedited appeals available for urgent cases.
Common Denials
| CARC Code | Reason | Prevention |
|---|---|---|
| CO-16 | Not medically necessary | Include clinical evidence, prior treatment history, physician justification |
| CO-45 | Not covered | Verify coverage under member's specific plan. Confirm service is covered benefit. |
| CO-50 | Services not rendered as billed | Verify codes, units of service, and place of service match actual delivery. |
Appeal Process
File appeal within 180 days of denial. Include denied claim details, new clinical evidence, and written explanation. Send to Aetna's appeals department via Availity or mail. Response time: 60 days for peer-to-peer review. If overturned, Aetna reprocesses claim within 30 days. Consider external review for large denials or patient safety disputes.
Common Questions
What is Aetna's denial rate?
Aetna's denial rate is 22% according to KFF data, higher than industry average. Common denial codes: CO-16 (not medically necessary), CO-45 (not covered), CO-50 (services not rendered as billed).
How long does Aetna take to review claims?
Pre-service decisions: 15 days. Post-service decisions: 30 days. Network providers may file claims up to 90 days from service date. Out-of-network: 180 days.
Where do I access Aetna's provider portal?
Aetna uses Availity for provider access. Log in to check eligibility, submit authorizations, track claims, and manage prior auth requests.
Altair checks Aetna requirements before submission . flagging missing authorizations and coding mismatches in real time. See how Altair works.
This reference is for informational purposes. Payer policies change frequently. Always verify against Aetna's current provider documentation. Last updated: 2026-03-16.
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