Appeal — TEST-CLAIM-00035

Date: [Date of Submission]

Synthetic Cigna
Appeals and Grievances Department
[Payer Address]

Re: Formal Appeal of Claim Denial
Claim Number: TEST-CLAIM-00035
Payer: Synthetic Cigna
Service Date: November 7, 2025
Denial Date: December 25, 2025
Denial Reason: CO-198 – Precertification/Authorization Exceeded
Denied Amount: $1,627.72
Appeal Deadline: April 24, 2026

To Whom It May Concern:

[Facility Name] (hereinafter "the Facility") hereby submits this formal appeal contesting the denial issued on December 25, 2025, for services rendered on November 7, 2025, under Claim Number TEST-CLAIM-00035. The denial was issued under reason code CO-198, asserting that precertification or authorization was exceeded. For the reasons set forth below, the Facility respectfully requests that Synthetic Cigna overturn this denial and reprocess the claim for payment of the denied amount of $1,627.72.

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I. BACKGROUND AND BASIS FOR DENIAL

Services billed under Claim TEST-CLAIM-00035 include CPT 25670 (wrist arthroplasty) and CPT 80236 (clinical chemistry panel), with a total billed amount of $2,022.27. Synthetic Cigna denied $1,627.72 of this amount under CO-198, indicating that the services rendered exceeded the scope or monetary limits of the granted precertification or prior authorization.

The Facility disputes this determination. The enclosed documentation demonstrates that the services provided either (1) fell within the authorized scope and dollar limits of the active prior authorization in effect on the date of service, or (2) constituted medically necessary extensions of the approved treatment plan that should not be subject to denial under Synthetic Cigna's own prior authorization scope and dollar-limit requirements.

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II. GROUNDS FOR APPEAL

A. The Prior Authorization Was Valid and Applicable

The enclosed prior authorization approval letter confirms that a valid precertification was obtained in advance of the November 7, 2025 service date. The Facility submits that the procedures billed — CPT 25670 and CPT 80236 — were performed in accordance with the parameters of that authorization. A review of the enclosed itemized service statement, which provides a detailed breakdown of all charges billed, should confirm that the services rendered did not exceed the authorized scope in a manner that would appropriately trigger a CO-198 denial.

B. Any Alleged Excess Was Medically Necessary and Clinically Justified

To the extent Synthetic Cigna contends that any portion of the billed services exceeded the literal parameters of the authorization, the Facility asserts that such services were medically necessary and clinically required in connection with the authorized treatment plan. The enclosed letter of medical necessity and supporting clinical notes document the medical rationale for all services rendered on November 7, 2025. Denial of medically necessary services that are integral to an authorized procedure on the basis of a technical authorization overage is inconsistent with sound clinical and coverage principles.

C. Payer Policy Permits Coverage of Clinically Necessary Adjunct Services

Synthetic Cigna's own prior authorization scope and dollar-limit requirements should be construed in a manner consistent with the coverage of medically necessary adjunct services that arise in the context of an authorized procedure. The clinical chemistry panel (CPT 80236) and wrist arthroplasty (CPT 25670) are clinically interrelated services. Applying an authorization cap in a manner that excludes medically necessary components of an authorized surgical episode is contrary to the intent of precertification requirements and may constitute a misapplication of the CO-198 denial rationale.

D. The Denial Determination Should Be Reconsidered in Light of Enclosed Documentation

The Facility respectfully requests that Synthetic Cigna's reviewing clinician and appeals staff carefully evaluate the enclosed documentation in its entirety before affirming this denial. The record as a whole — including the prior authorization approval letter, operative report, letter of medical necessity, itemized service statement, and clinical notes — supports the conclusion that the denial was issued in error or based on an incomplete review of the authorization record.

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III. SUPPORTING DOCUMENTATION ENCLOSED

The following documents are enclosed in support of this appeal:

1. Prior authorization approval letter
2. Operative report and procedure documentation for CPT 25670
3. Letter of medical necessity
4. Itemized service statement reflecting the breakdown of all billed charges
5. Clinical notes supporting the services rendered on November 7, 2025
6. Relevant excerpts from Synthetic Cigna's prior authorization guidelines or coverage policy

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IV. REQUESTED REMEDY

The Facility respectfully requests that Synthetic Cigna:

1. Overturn the CO-198 denial issued on December 25, 2025, for Claim TEST-CLAIM-00035;
2. Reprocess the claim in full in accordance with the applicable plan benefits and the valid prior authorization on file; and
3. Issue payment of the denied amount of $1,627.72 promptly upon completion of the appeal review.

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V. CONCLUSION

The services rendered on November 7, 2025, were medically necessary, properly authorized, and billed in accordance with applicable procedure codes and documentation requirements. The CO-198 denial either reflects a misapplication of the prior authorization parameters or a failure to account for the medical necessity of the services provided. The Facility is confident that a thorough review of the enclosed documentation will support reversal of this denial.

Should Synthetic Cigna require any additional information to complete its review, please contact the Facility's Appeals and Billing Department at the contact information below.

Respectfully submitted,

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

Enclosures: As listed in Section III above