CARC and RARC Basics for Medical Billing

CARC: adjustment category and reason

A Claim Adjustment Reason Code identifies why an amount was adjusted. The group and financial context on the remittance matter when deciding who may be responsible.

RARC: additional explanation

A Remittance Advice Remark Code can add detail about the adjustment, documentation, policy, or processing situation.

Translate code to action

Map the message back to the exact claim data and documentation before editing. Some messages call for a corrected claim; others may call for an appeal, records, eligibility review, or no billing change.

Use current code references

Reason and remark code sets are maintained standards. Use the current payer/remittance explanation and official code-set references rather than an old office cheat sheet.

Read adjustment codes in context

• Read the CARC, RARC, group code, claim/service-line detail, and payer explanation together.
• Do not assume a code means the claim should simply be resubmitted; determine whether the issue is coverage, coding, documentation, authorization, eligibility, or another cause.
• Keep the original remittance data when making a correction or appeal so the reason for the action remains traceable.

Where to verify the rule

Requirements connected with carc and rarc basics for medical billing can vary by payer, plan, contract, program, and date of service. Verify the rule in the payer’s current provider manual, portal guidance, or other authoritative instructions rather than treating a prior claim as the rule.

Related guides

• Medical Billing Modifiers: A Practical Introduction
• CPT and HCPCS Codes: Billing Basics
• ICD-10 Diagnosis Codes: Billing Basics