How do I resolve a CO-48 denial?

Verify the procedure code(s) against the patient's plan benefits and the provider's contract: Confirm that the denied service is indeed excluded from coverage under this specific plan and that the CO assignment is correct per your contract terms Post the contractual adjustment to the patient account: Write off the denied amount as a contractual adjustment without transferring any balance to patient responsibility Document the non-covered service for future reference: Update internal systems to flag this procedure as non-covered for this payer/plan combination to prevent future submission errors

835 Denial Combination

CO-48

Contractual Obligation · Service-Line Level Adjustment

Contractual Obligation

What This Combination Means

The payer is denying payment because the submitted procedure(s) are not covered benefits under the patient's health plan. Because this is marked as Contractual Obligation (CO), the provider has agreed via their payer contract to accept this non-coverage determination and must write off the amount without transferring the balance to the patient.

Financial Responsibility

provider writeoff

The provider must write off the full amount of the denied procedure(s) as required by their contractual agreement with the payer. The patient cannot be billed for these non-covered services.

N/A

Appeal Success

Immediate (write-off)

Avg. Resolution

Easy

Difficulty

Appealable

Step-by-Step Resolution

Steps tailored specifically to this CO-48 combination — not generic advice.

Not Appealable:CO-based non-covered service denials reflect contractual benefit limitations that the provider has agreed to accept and cannot appeal as coverage determinations.

1
Verify the procedure code(s) against the patient's plan benefits and the provider's contract
Confirm that the denied service is indeed excluded from coverage under this specific plan and that the CO assignment is correct per your contract terms
2
Post the contractual adjustment to the patient account
Write off the denied amount as a contractual adjustment without transferring any balance to patient responsibility
3
Document the non-covered service for future reference
Update internal systems to flag this procedure as non-covered for this payer/plan combination to prevent future submission errors

Specialty Context

How CO-48 typically presents across different practice types.

Dental

Common for cosmetic procedures, orthodontics for adults, or services exceeding plan limitations such as additional cleanings beyond the covered frequency.

Medical

Frequently applies to experimental treatments, cosmetic procedures, over-the-counter supplies, or services specifically excluded in the benefit plan.

Behavioral Health

May occur for services exceeding session limits, non-covered modalities, or counseling types excluded from mental health benefits such as educational or court-ordered sessions.

Individual Code References

View the standalone definition for each code in this combination.

CARC 48

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Synthesized from official definitions — not from training data

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