Quick Explanation
Denial code CO-107 occurs when a payer receives a claim for a service that requires a primary, qualifying, or related procedure, but that underlying service was not identified or referenced on the claim. This commonly happens with add-on codes, assistant surgeon services, or split-billed procedures that depend on a primary claim to be processed first.
Common Causes for CO-107
Denials with code CO-107 typically happen for the following specific reasons:
- Submitting an add-on CPT code without reporting the corresponding primary procedure code on the same claim form.
- Billing for assistant surgeon services (using modifiers 80, 81, 82, or AS) before the primary surgeon's claim has been submitted or processed.
- Omitting the necessary institutional or professional cross-reference numbers (such as Box 19 on the CMS-1500 or Box 44/80 on the UB-04) that link related claims.
- Failing to report qualifying prior services, such as a prior inpatient stay or diagnostic testing, required under specific payer medical policies.
How to Prevent CO-107 Denials
To avoid receiving this denial in the future, implement these specific checks:
- Establish front-end claim scrubber edits that prevent add-on codes from being billed without their associated primary CPT codes.
- Coordinate billing workflows to ensure assistant surgeon claims are submitted concurrently with or immediately following the primary surgeon's claim.
- Utilize Box 19 on CMS-1500 claims to document the primary claim ID, primary provider name, and date of service for dependent procedures.
- Review payer-specific policies for compound or split-bill services to ensure all related claims are linked with appropriate modifiers or condition codes.
Appeal Letter Template for CO-107
If you believe this claim was denied incorrectly, you can use the following template to submit an appeal.
[Your Practice Header]
[Date]
[Payer Name]
[Appeals Department Address]
RE: Appeal for Claim [Claim Number]
Patient: [Patient Name]
ID: [Patient ID]
Date of Service: [Date]
Denial Code: CO-107 - The related or qualifying claim/service was not identified on this claim
Dear Appeals Department,
I am writing to appeal the denial of the above-referenced claim, which was denied with code CO-107: "The related or qualifying claim/service was not identified on this claim".
We are appealing the denial of the billed service, which was denied under code CO-107 for failing to identify a related or qualifying claim. In accordance with CMS Claims Processing Manual guidelines and AMA CPT coding conventions, the billed service [Insert Procedure Code] is a dependent service that is directly associated with the primary procedure [Insert Primary Procedure Code]. The primary procedure was performed on [Insert Date of Service] and was previously processed under Claim ID [Insert Primary Claim ID]. The attached clinical documentation clearly establishes the relationship between these two services and confirms that all qualifying criteria have been met. We respectfully request that you link this claim to the primary claim and reprocess this service for full payment.
Attached please find:
1. A copy of the original claim.
2. The relevant medical records supporting the service.
3. [Any other supporting documents].
We respectfully request that you reprocess this claim for payment.
Sincerely,
[Your Name]
[Title]
[Practice Name]
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