Quick Explanation
Denial code CO-143 indicates that the insurance carrier has deferred or postponed payment on a portion of the claim rather than issuing a final denial. This typically occurs when specific line items require manual review, coordination of benefits (COB) verification, or additional supporting documentation before a final determination can be made.
Common Causes for CO-143
Denials with code CO-143 typically happen for the following specific reasons:
- The claim involves potential third-party liability, such as Workers' Compensation or an auto accident, requiring verification of coverage responsibility.
- A coordination of benefits (COB) issue exists where the primary payer's Explanation of Benefits (EOB) was not properly submitted or matched for secondary payment.
- Specific high-cost or complex line items on the claim have been flagged for manual medical necessity review or clinical audit.
- The payer requires additional clinical documentation, such as operative reports or office notes, to adjudicate a specific portion of the multi-line claim.
How to Prevent CO-143 Denials
To avoid receiving this denial in the future, implement these specific checks:
- Verify patients' Coordination of Benefits (COB) and primary/secondary insurance status during the pre-registration and eligibility verification process.
- Proactively submit complete clinical documentation, including operative reports and medical charts, when billing for complex or high-cost procedures.
- Establish a clear workflow for identifying and routing claims involving third-party liability (Workers' Compensation or auto liability) with the correct accident indicators.
- Monitor clearinghouse and payer portals daily to quickly identify deferred claims and respond to requests for information within the required timely filing window.
Appeal Letter Template for CO-143
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-143 - Portion of payment deferred
Dear Appeals Department,
I am writing to appeal the denial of the above-referenced claim, which was denied with code CO-143: "Portion of payment deferred".
We are writing to appeal the deferred payment decision (CO-143) regarding the enclosed claim for services rendered. The services billed are medically necessary, fully supported by the attached clinical documentation, and coded in strict compliance with AMA CPT and CMS guidelines. All coordination of benefits (COB) requirements have been satisfied, and the primary payer's remittance advice is attached to facilitate the prompt adjudication of this secondary claim. We request that you review the attached medical records and immediately release the deferred portion of the payment to resolve this claim.
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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