How do I resolve a CO-39 denial?

Retrieve the original authorization request and payer denial response: Confirm the date of the authorization request, services requested, clinical information submitted, and the specific reason the payer denied authorization at that time Determine if services were rendered despite the authorization denial: If services were performed after authorization was denied, assess whether the patient was properly notified and if an ABN or similar waiver was obtained Prepare and submit an appeal with supporting clinical documentation: Include evidence of medical necessity, relevant clinical guidelines, and any additional information that addresses the payer's original denial reason to demonstrate authorization should have been granted

835 Denial Combination

CO-39

Contractual Obligation · Service-Line Level Adjustment

Authorization

What This Combination Means

This denial indicates the payer declined to authorize or pre-certify services at the time the authorization request was submitted, before services were rendered. The provider is contractually obligated to write off the denied amount and cannot pursue payment from either the payer or the patient for these unauthorized services.

Financial Responsibility

provider writeoff

The provider must write off the full denied amount due to contractual obligations. The patient has no financial liability because the authorization was denied prospectively.

30%

Appeal Success

30-60 days (appeal process)

Avg. Resolution

Hard

Difficulty

Yes

Appealable

Step-by-Step Resolution

Steps tailored specifically to this CO-39 combination — not generic advice.

Appealable:Authorization denials may be appealed if the provider can demonstrate medical necessity or that authorization requirements were met at the time of the request.

1
Retrieve the original authorization request and payer denial response
Confirm the date of the authorization request, services requested, clinical information submitted, and the specific reason the payer denied authorization at that time
2
Determine if services were rendered despite the authorization denial
If services were performed after authorization was denied, assess whether the patient was properly notified and if an ABN or similar waiver was obtained
3
Prepare and submit an appeal with supporting clinical documentation
Include evidence of medical necessity, relevant clinical guidelines, and any additional information that addresses the payer's original denial reason to demonstrate authorization should have been granted

Specialty Context

How CO-39 typically presents across different practice types.

Dental

Common for specialized procedures like orthognathic surgery, TMJ treatment, or sleep apnea appliances where pre-authorization is routinely required and medical necessity criteria must be met prospectively

Medical

Frequently appears for elective surgeries, advanced imaging, durable medical equipment, and specialty referrals where authorization was requested prior to service but denied based on medical necessity review or policy criteria

Behavioral Health

Often seen for inpatient psychiatric admissions, intensive outpatient programs, residential treatment, or extended therapy sessions where pre-authorization was submitted but denied based on level-of-care criteria or lack of documented medical necessity

Individual Code References

View the standalone definition for each code in this combination.

CARC 39

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Synthesized from official definitions — not from training data

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