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236
CO - Contractual ObligationCoding/Billing
Denial Code CO-236: Procedure/Modifier Not Allowed Together
What Does Code 236 Mean?
This procedure or procedure/modifier combination is not compatible with another procedure or procedure/modifier combination provided on the same day.
Group Code CO (Contractual Obligation): The provider has agreed to accept the payer's determination. The patient is generally not responsible for this amount.
Why Does This Happen?
Mutually exclusive procedures were billed together, or modifier combinations are invalid.
How to Resolve It
- 1Review which procedures can be billed together
- 2Check NCCI Mutually Exclusive Edits
- 3If services are distinct, use appropriate modifiers
- 4Remove the conflicting code if it was billed in error