Medical Billing Denial Code Lookup
Search common Claim Adjustment Reason Codes (CARCs) and use the remittance advice to guide the next billing follow-up step.
Look up common Claim Adjustment Reason Codes
Search common CARCs by number or description. CARCs explain why a claim or service line was paid differently than billed. Group codes such as CO, PR, OA and PI identify the adjustment category or responsibility.
Example
Searching 45 returns the CARC used when a charge exceeds a fee schedule, maximum allowable amount or contracted/legislated arrangement.
Do not stop at the CARC
Review the full remittance advice. Some CARCs require or are further explained by a Remittance Advice Remark Code (RARC), and payer-specific follow-up may still be necessary.
Enter a CARC or keyword to search the reference list.
How to Read CARC & RARC Codes
Read adjustment codes with the claim, payer and remittance context before choosing a correction or appeal.
Read the guide →Use the calculator with your own practice data
These tools are free to use and link to. Save the page for recurring monthly review, or share it with the team responsible for billing and revenue-cycle reporting.
View all free tools →Turn the result into an action plan
Use the tool as a starting point, then request a complimentary billing review for help with denials, A/R, coding workflows and revenue-cycle performance.