CO-59
Processed based on multiple or concurrent procedure rules
What This Code Means
Payment was reduced because multiple procedures, multiple surgeries, or concurrent anesthesia rules applied.
Common Causes
- Multiple surgical procedures performed in the same session
- Concurrent anesthesia billed without required modifiers
How to Resolve or Appeal
- Confirm standard multiple-procedure payment reduction rules apply correctly
- Verify modifiers (51, 59, etc.) were applied where appropriate
More Denial Codes to Check
Educational reference only — not medical or legal advice. Always confirm code usage and appeal rights with the specific payer.