How do I resolve a CO-252+N436 denial?

Identify the specific documentation required for injury claim acceptance: Contact the workers' compensation payer to determine what attachments or evidence are needed to establish the claim as an accepted injury case rather than just a mandatory medical payment Obtain and compile required injury claim documentation: Gather employer injury reports, first report of injury forms, clinical notes linking treatment to the specific workplace incident, and any other documentation requested by the workers' comp carrier Submit documentation with claim reconsideration request: Send all attachments to the workers' comp payer requesting full adjudication and acceptance of the injury claim, which may result in additional reimbursement beyond the mandatory medical payment already issued

835 Denial Combination

CO-252+N436

Contractual Obligation · Claim-Level Adjustment

Missing Information

What This Combination Means

This combination appears on workers' compensation or injury-related claims where the payer has issued a mandatory medical payment despite not formally accepting liability for the injury claim. The CO-252 indicates missing documentation is needed to fully adjudicate the claim, while N436 clarifies that payment is being made under mandatory medical benefit provisions rather than as an accepted injury claim. The provider must write off any remaining balance per contractual obligations with the workers' comp payer.

Financial Responsibility

provider writeoff

The provider must write off any adjustment amount under CO group code rules. The mandatory medical reimbursement represents partial payment made by the workers' comp carrier pending claim acceptance determination.

90%

Appeal Success

30-45 days for documentation submission and claim reconsideration

Avg. Resolution

Medium

Difficulty

Yes

Appealable

Step-by-Step Resolution

Steps tailored specifically to this CO-252+N436 combination — not generic advice.

Appealable:The missing documentation requirement can be addressed by submitting the requested attachments to potentially obtain full claim acceptance and additional reimbursement.

1
Identify the specific documentation required for injury claim acceptance
Contact the workers' compensation payer to determine what attachments or evidence are needed to establish the claim as an accepted injury case rather than just a mandatory medical payment
2
Obtain and compile required injury claim documentation
Gather employer injury reports, first report of injury forms, clinical notes linking treatment to the specific workplace incident, and any other documentation requested by the workers' comp carrier
3
Submit documentation with claim reconsideration request
Send all attachments to the workers' comp payer requesting full adjudication and acceptance of the injury claim, which may result in additional reimbursement beyond the mandatory medical payment already issued

Specialty Context

How CO-252+N436 typically presents across different practice types.

Dental

May occur for dental trauma or injury claims under workers' compensation when the carrier makes a mandatory payment but requires additional documentation to formally accept the workplace injury claim.

Medical

Common in occupational medicine, emergency departments, and orthopedics treating workplace injuries where the workers' comp carrier issues mandatory medical payments while investigating claim validity and employer liability.

Behavioral Health

May appear for psychological injury or PTSD claims related to workplace incidents where the workers' comp carrier pays for initial evaluation under mandatory provisions but requires additional documentation to accept the psychological injury claim.

Individual Code References

View the standalone definition for each code in this combination.

CARC 252 RARC N436

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Synthesized from official definitions — not from training data

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