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59
CO - Contractual ObligationPayment Adjustment
Denial Code CO-59: Multiple/Concurrent Procedure Adjustment
What Does Code 59 Mean?
Charges are adjusted based on multiple/concurrent procedure rules. When multiple procedures are performed at the same session, payment for subsequent procedures is typically reduced.
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?
Standard multiple procedure payment reduction (MPPR) per CMS or payer policy.
How to Resolve It
- 1Verify the reduction percentage is correct per the fee schedule
- 2Ensure correct use of modifier -51 or -59
- 3If services are distinct anatomic sites, use appropriate modifiers
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