Can CO-27 denials be appealed?

Yes, CO-27 denials can be appealed or resolved via corrected claim within the payer's filing window (typically 30 days). Average industry overturn rate is 25%.

CO-27 Patient Eligibility & Benefits Critical Severity

CO-27: Expenses Incurred After Coverage Terminated

Patient insurance coverage was terminated prior to date of service

Appealable?

Yes — Standard

Avg Recovery Rate

25%

Filing Window

~30 Days

Common RARCs

N30, MA04

1. What Does Denial Code CO-27 Mean?

The patient's insurance policy had expired, was cancelled, or was terminated prior to the date of service.

2. Top Root Causes for CO-27

Most CO-27 rejections trace back to one of the following billing or clinical discrepancies:

Patient changed employers or lost coverage prior to the appointment

COBRA continuation coverage was never elected or paid

Front desk failed to re-verify insurance eligibility at check-in

3. Resolution Checklist for CO-27

Interactive Checklist

Step through these concrete audit items before submitting a corrected claim or filing a formal appeal:

Check payer eligibility system for termination effective date

Contact patient to obtain new insurance policy card active on the date of service

If new insurance found, bill new payer within their timely filing window

If patient was uninsured on DOS, transfer balance to patient statement with financial hardship options

4. Appeal Strategy & Letter Template

Only appeal if payer termination date in their system is inaccurate compared to verified proof of coverage on the service date.

RE: Coverage Termination Dispute (CO-27)
Patient: [Patient Name] | Policy ID: [Policy ID] | DOS: [DOS]

We are disputing the coverage termination denial for DOS [DOS]. Enclosed is confirmation from [Employer HR / Plan Administrator] verifying the patient was covered under an active group plan through [Actual Termination Date], encompassing our date of service. Please reprocess for payment.

How ClaimCure Prevents CO-27 Automatically

Rather than reacting to CO-27 on post-adjudication 835 ERAs weeks after service, ClaimCure's pre-submission 4-bucket scrubber audits claims in real-time before electronic dispatch:

Mandate real-time 270/271 eligibility batch verification on the morning of every appointment

Try ClaimCure Claim Scrubber Free →

Free Appeal Toolkit

Get the CO-27 Resolution Kit

Download our customized appeal checklist, CMS citation references, and payer timely filing matrix for CO-27.

Work Email

Practice / Company Name

Practice Size

HIPAA-compliant. Zero PHI collected.

Related Denial Codes

CO-22 Coordination of Benefits / Other Payer

PR-204 Non-Covered Benefit Exclusion

PR-1 Deductible Amount

PR-2 Coinsurance Amount