Appeal — TEST-CLAIM-00016

Date: [Date of Submission]

Synthetic Aetna
Appeals and Grievances Department
[Payer Address]

Re: Formal Appeal of Claim Denial
Claim Number: TEST-CLAIM-00016
Internal Claim ID: 8b09ba64-b170-4e98-8360-09b3b9f1387c
Date of Service: 2026-02-14
Denial Date: 2026-04-24
Billed Amount: $3,683.44
Denied Amount: $3,018.08
Appeal Deadline: 2026-10-21

Dear Synthetic Aetna Appeals and Grievances Department,

This letter constitutes a formal appeal on behalf of the undersigned facility regarding the denial of the above-referenced claim. The claim was denied on 2026-04-24 under CARC CO-16: "Claim/service lacks information or has submission/billing error(s)." We respectfully contest this denial and request that the claim be reprocessed and paid in accordance with the applicable contract terms and coverage benefits.

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I. BACKGROUND AND STATEMENT OF DENIAL

On 2026-02-14, our facility rendered medically necessary services to the patient associated with Claim TEST-CLAIM-00016. The claim was submitted with the following procedure and diagnosis codes:

  - CPT 35825 (vascular procedure)
  - CPT 57739 (vaginal procedure)
  - CPT 66531 (ocular procedure)
  - ICD-10 Diagnosis Code: N39.79 (Other specified urinary symptoms and signs)

Synthetic Aetna subsequently denied $3,018.08 of the $3,683.44 billed amount, citing CO-16, which identifies a missing information or submission/billing error as the basis for non-payment. Critically, the denial does not challenge medical necessity, coverage eligibility, or plan exclusions. Rather, it identifies a correctable administrative or coding deficiency — a denial category that is directly addressable through this appeal.

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II. BASIS FOR APPEAL

The facility respectfully asserts that the services billed under Claim TEST-CLAIM-00016 were rendered as documented and that any deficiency identified under CO-16 is correctable and does not reflect a substantive coverage issue. The following points support overturn of this denial:

  • The CO-16 denial reason is administrative in nature, not a coverage or medical necessity exclusion. Synthetic Aetna's own claim submission and billing accuracy requirements provide that a corrected claim or supporting documentation can remedy such a deficiency. Because the services were performed and documented, the denial should be resolved through reprocessing upon review of the enclosed supporting materials.

  • All three procedure codes (CPT 35825, 57739, and 66531) correspond to services performed on the date of service and are supported by the enclosed operative report and clinical documentation. Each procedure code is linked to the documented service, and the itemized claim submission reflects the appropriate modifiers and diagnosis-to-procedure alignment.

  • The diagnosis code N39.79 was accurately reported in accordance with the documented clinical findings and appropriately maps to the procedures rendered. Any perceived discrepancy between the diagnosis code and the procedure codes is addressed and clarified in the enclosed medical records and supporting documentation.

  • To the extent that Synthetic Aetna identified a specific field-level or coding error as the basis for the CO-16 denial, the facility has reviewed the Explanation of Benefits and payer correspondence and has prepared corrected documentation addressing the identified deficiency. The enclosed materials provide complete and accurate information sufficient to satisfy the payer's submission requirements.

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III. SUPPORTING DOCUMENTATION

In support of this appeal, the following documents are enclosed:

  1. The enclosed itemized claim submission, reflecting all procedure codes, modifiers, and billing fields as submitted and, where applicable, corrected.
  2. The enclosed operative report and clinical documentation, linking each CPT code (35825, 57739, and 66531) to the services performed on 2026-02-14.
  3. The enclosed medical records supporting the medical necessity and clinical appropriateness of each procedure billed.
  4. The enclosed Explanation of Benefits and payer correspondence received in connection with the denial dated 2026-04-24, included for reference.
  5. The enclosed letter of medical necessity, further substantiating the clinical basis for the services rendered.

These materials collectively demonstrate that the services were performed as billed, that the claim contained the information necessary to process payment, and that any administrative deficiency has been remedied.

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IV. REQUESTED REMEDY

The facility respectfully requests that Synthetic Aetna:

  1. Conduct a full review of this appeal and the enclosed supporting documentation;
  2. Overturn the CO-16 denial issued on 2026-04-24 for Claim TEST-CLAIM-00016; and
  3. Reprocess the claim and issue payment of the denied amount of $3,018.08 in accordance with the applicable contractual rates and plan benefits.

Should Synthetic Aetna require any additional information or clarification to complete its review, please contact the undersigned at the information provided below. We respectfully request written acknowledgment of this appeal and a response within the timeframe specified under the applicable appeals process.

Thank you for your prompt attention to this matter. We trust that upon review of the enclosed documentation, Synthetic Aetna will agree that the denial of Claim TEST-CLAIM-00016 should be overturned and payment issued accordingly.

Respectfully submitted,

[Authorized Representative Name]
[Title]
[Facility Name]
[Address]
[Phone Number]
[Fax Number]
[Email Address]

Enclosures:
  - Itemized claim submission
  - Operative report and clinical documentation
  - Medical records
  - Explanation of Benefits / payer denial correspondence
  - Letter of medical necessity