Can CO-22 denials be appealed?

Yes, CO-22 denials can be appealed or resolved via corrected claim within the payer's filing window (typically 60 days). Average industry overturn rate is 65%.

CO-22 Patient Eligibility & Benefits High Severity

CO-22: Coordination of Benefits / Care May Be Covered by Another Payer

Payment adjusted because care may be covered by another primary insurer

Appealable?

Yes — Standard

Avg Recovery Rate

65%

Filing Window

~60 Days

Common RARCs

N255, N256

1. What Does Denial Code CO-22 Mean?

The payer believes another insurance entity is the primary payer (e.g., Medicare vs. commercial employer group health plan, worker's compensation, or auto liability).

2. Top Root Causes for CO-22

Most CO-22 rejections trace back to one of the following billing or clinical discrepancies:

Patient has not updated their annual Coordination of Benefits (COB) survey with their insurer

Accident or injury diagnosis billed without casualty/liability payer information

Commercial payer assuming Medicare or spouse employer plan is primary

3. Resolution Checklist for CO-22

Interactive Checklist

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

Contact patient immediately and instruct them to call payer member services to update COB

Verify Medicare secondary payer (MSP) rules regarding employer size and retirement status

If liability or auto accident, submit claim to primary casualty insurer first

Once COB is updated with payer, request electronic claim reprocessing

4. Appeal Strategy & Letter Template

Direct provider appeals fail until the insured patient contacts their carrier to update their COB profile. Once updated, a quick phone call or corrected electronic claim triggers payment.

RE: Coordination of Benefits Resolution (CO-22)
Patient: [Patient Name] | Member ID: [Member ID] | DOS: [DOS]

The patient contacted your member services department on [Date] and completed the annual Coordination of Benefits verification questionnaire confirming [Payer Name] is primary payer. Please reprocess this claim for payment.

How ClaimCure Prevents CO-22 Automatically

Rather than reacting to CO-22 on post-adjudication 835 ERAs weeks after service, ClaimCure's pre-submission 4-bucket scrubber audits claims in real-time before electronic dispatch:

Verify COB status and secondary coverage during intake at front desk
Run automated 270 eligibility checks that inspect primary vs secondary policy indicators

Try ClaimCure Claim Scrubber Free →

Free Appeal Toolkit

Get the CO-22 Resolution Kit

Download our customized appeal checklist, CMS citation references, and payer timely filing matrix for CO-22.

Work Email

Practice / Company Name

Practice Size

HIPAA-compliant. Zero PHI collected.

Related Denial Codes

CO-27 Expenses Incurred After Termination

PR-204 Non-Covered Benefit Exclusion

PR-1 Deductible Amount

PR-2 Coinsurance Amount