835 Denial Combination

CO-120

CO

Contractual Obligation · Claim-Level Adjustment

Contractual Obligation

What This Combination Means

This adjustment indicates the claim was processed under managed care contractual terms rather than standard fee-for-service rates. The payer is informing the provider that managed care network pricing applies to this patient, requiring a contractual write-off of the difference between billed charges and allowed amounts.

Financial Responsibility

provider writeoff

The provider must write off the adjusted amount as a contractual obligation under the managed care agreement. The patient cannot be billed for this difference.

N/A

Appeal Success

Immediate (write-off)

Avg. Resolution

Easy

Difficulty

No

Appealable

Step-by-Step Resolution

Steps tailored specifically to this CO-120 combination — not generic advice.

Not Appealable:This is a contractual adjustment based on the patient's managed care coverage status, not a denial of payment or service.
  1. 1

    Verify patient's managed care enrollment status in the payer system

    Confirm the patient is actively enrolled in the managed care plan to validate the adjustment

  2. 2

    Apply contractual adjustment to patient account

    Post the write-off amount as a managed care contractual adjustment and ensure patient balance reflects only allowed copay/coinsurance

  3. 3

    Update patient demographic records with managed care plan information

    Ensure future claims for this patient route correctly through managed care network to prevent billing errors

Specialty Context

How CO-120 typically presents across different practice types.

Dental

Dental managed care plans (DHMO/PPO) often use this code when services are billed outside the capitation structure or require adjustment to in-network fee schedules.

Medical

Common in HMO, EPO, and ACO arrangements where the claim must be adjusted to reflect network-specific rates or capitated arrangements.

Behavioral Health

Behavioral health managed care carve-outs frequently generate this adjustment when claims are processed through specialized managed care entities rather than primary insurance.

Individual Code References

View the standalone definition for each code in this combination.

CARC 120

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Synthesized from official definitions — not from training data

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