CO-45 Denial Code: What It Means, Causes & How to Resolve It [2026]
The CO-45 denial code appears on more remittance advices than almost any other adjustment code in medical billing. It’s not a denial in the way most people think. Your claim was processed and paid; CO-45 just documents the gap between what you billed and what your payer contract allows. According to the AMA’s National Health […]
