835 Denial Combination

CO-8

CO

Contractual Obligation · Claim-Level Adjustment

What This Combination Means

The CPT or procedure code submitted is not valid for the service date — the code was invalid or not in use on the date of service.

90%

Appeal Success

3-7 days

Avg. Resolution

Easy

Difficulty

Yes

Appealable

Step-by-Step Resolution

Steps tailored specifically to this CO-8 combination — not generic advice.

  1. 1

    Verify the CPT code was active and valid for the date of service.

  2. 2

    If a newer code should have been used, identify the correct code per the CPT codebook for that year.

  3. 3

    Resubmit with the correct procedure code.

Specialty Context

How CO-8 typically presents across different practice types.

Dental

Verify the cpt or procedure code submitted is not valid for the service date — the code was invalid or not in use on the date of service per your dental plan contract and documentation requirements.

Medical

Confirm the cpt or procedure code submitted is not valid for the service date — the code was invalid or not in use on the date of service against payer policy and submit corrected claim as needed.

Behavioral Health

Apply behavioral health parity rules and confirm the cpt or procedure code submitted is not valid for the service date — the code was invalid or not in use on the date of service per MHPAEA standards.

Individual Code References

View the standalone definition for each code in this combination.

CARC 8

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