Quick Explanation
Denial code CO-27 indicates that the medical services were rendered after the patient's health insurance policy was officially terminated. Because no active coverage existed on the date of service, the insurance payer is not responsible for the costs incurred. To resolve this, providers must verify if a new active policy exists or transition the account to self-pay status.
Common Causes for CO-27
Denials with code CO-27 typically happen for the following specific reasons:
- The patient experienced a loss of employment or changed employers, resulting in the termination of their group health coverage prior to the date of service.
- The policyholder failed to pay their insurance premiums, leading the payer to terminate coverage retroactively after any applicable grace periods expired.
- The front desk staff relied on outdated insurance information on file without performing a real-time eligibility check on the day of the patient's visit.
- The payer retroactively terminated the plan membership after initially showing an 'active' status during the provider's pre-service verification inquiry.
How to Prevent CO-27 Denials
To avoid receiving this denial in the future, implement these specific checks:
- Implement automated real-time eligibility (RTE) verification for every patient at check-in on the exact date of service.
- Require front-desk staff to physically inspect and scan the patient's current insurance card at every visit, confirming any changes to employment or coverage.
- Run automated batch eligibility checks 24 to 48 hours prior to all scheduled appointments to identify terminated coverage before the patient arrives.
- Train scheduling staff to secure updated secondary insurance or signed self-pay financial responsibility waivers during the pre-registration process.
Appeal Letter Template for CO-27
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-27 - Expenses incurred after coverage terminated
Dear Appeals Department,
I am writing to appeal the denial of the above-referenced claim, which was denied with code CO-27: "Expenses incurred after coverage terminated".
We are appealing the denial for claim [Claim Number] under code CO-27 (Expenses incurred after coverage terminated). On the date of service, [Date of Service], our staff verified active eligibility through the electronic HIPAA 270 transaction portal, which confirmed active coverage under Member ID [Member ID] with no indication of pending termination. Relying in good faith on the payer's verified eligibility response, we provided medically necessary services. Under CMS guidelines and industry-standard prompt payment regulations, payers must maintain accurate, real-time electronic eligibility databases. Because the retroactive termination of the patient's policy occurred after our verified check on the date of service, we respectfully request that the payer honor the initial eligibility affirmation and process this claim for 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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