Aetna CO-204 Non-Covered Denials in OB/GYN
Service/equipment/drug is not covered under the patient's current benefit plan. Copy-paste appeal letter with documented overturn rate and attachment checklist for Aetna in OB/GYN.
Verify before filing
Filing deadlines, appeal addresses, and policy criteria in this template reflect typical payer behavior at publication. Aetna updates policies frequently and plan-level rules vary by employer group, state, and line of business. Always cross-check the specific deadline and filing address on your EOB, and confirm current Aetnamedical-policy language through the payer’s provider portal before submitting an appeal. Overturn-rate language below reflects AAPC-reviewer consensus, not payer-published statistics.
When to use this template
Aetna CO-204 denials in OB/GYN most often involve infertility services (covered by a subset of plans only), elective surgical interventions (tubal ligation outside C-section context, elective hysterectomy for benign disease), and occasionally hormonal treatments that Aetna classifies as cosmetic or elective.
Attachment checklist
- Ordering provider note with clinical indication
- Prior workup or conservative-care documentation
- Payer medical policy reference citing met criteria
- Retroactive authorization request (if applicable)
Missing any one of these is the single largest cause of appeal denials. Build a pre-filing checklist before you submit.
Copy-paste letter template
Swap in your patient details at every [bracketed field]. Attach the documentation listed above. Submit within 180 days of the original adjudication.
[Practice Letterhead] [Date] Aetna Provider Appeals PO Box 14463 Lexington, KY 40512 Re: Appeal of CO-204 Non-Covered Denial Member: [Patient Name] Member ID: [Member ID] Date of Service: [DOS] Claim Number: [Claim #] CPT: [e.g., 58150 - Total abdominal hysterectomy] Aetna CPB: [number] To Whom It May Concern: We appeal the CO-204 denial. The service was medically indicated and meets Aetna CPB [number] criteria. Clinical Indication: Patient, [age] y/o G[x]P[x] with [diagnosis, e.g., menorrhagia, fibroid uterus, ICD-10]. Failed conservative management: - Hormonal therapy: [medication, dose, duration, response] - Endometrial ablation: [date, technique, outcome, persistent bleeding] - [UAE consideration or attempt if applicable] Symptoms persistent despite conservative care: [symptom documentation, bleeding frequency, anemia labs, functional impact]. Hysterectomy is indicated per Aetna CPB [number] criteria: 1. Failed hormonal management: [documented] 2. Failed less-invasive intervention: [ablation documented] 3. Persistent symptoms with functional impact: [documented] Documentation attached: 1. OB/GYN clinical notes 2. Prior treatment documentation 3. Pathology from ablation (if performed) 4. Lab results (CBC showing anemia) 5. CPB [number] criteria worksheet Sincerely, [Surgeon Name]
Verify whether this is a plan-level exclusion (appeal futile) or a specific-indication coverage issue (appeal with correct ICD-10). The EOB or the member's benefit summary will tell you which.
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Related templates
Same code, different payer. Or same payer, different problem
Want the full playbook for this scenario?
The complete playbook page covers why Aetna throws CO-204 specifically in ob/gyn, the exact fix workflow, filing deadlines, high-risk CPTs, and FAQs. Plus this same copy-paste letter.
Read the full playbookCommon questions on this template
How long do I have to file a CO-204 appeal with Aetna?
180 days from the initial adjudication date for most Aetna plans. Corrected claims (for administrative fixes like missing modifiers or auth numbers) have a different and usually longer window. Always confirm the specific deadline on the EOB for your claim.
What is the typical overturn rate for this denial type?
50-65 percent for medical-indication cases; near 0 for elective. Success depends heavily on documentation completeness and whether the clinical criteria in Aetna's medical policy are matched point-by-point in the appeal.
Should I file this as a corrected claim or a formal appeal?
CO-204 denials are usually formal clinical appeals. The template below follows the formal-appeal structure. Use a corrected claim only if the fix is administrative (a missing modifier, wrong NPI) rather than clinical.
Can I reuse this template for other payers?
The structure works for any payer, but the filing address, deadline, and policy references are specific to Aetna. Check our other templates for payer-specific versions; we have 50+ payer/code combinations in the directory.
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