Denials and Appeals/Intermediate/25 minutes/Reviewed 2026-07-10
How to Read an ERA: Group Codes, CARCs, and RARCs
Translate an 835 remittance into financial responsibility, root cause, and the next operational action.
Quick answer
The group code assigns the adjustment category, the CARC gives the general reason, and RARCs add detail. Read the full combination at claim and line level before deciding who owns the balance or what to do next.
Rules to know
- CO generally signals contractual obligation and PR patient responsibility under the remittance rules.
- A CARC may be too broad without its associated RARC.
- PLB adjustments are provider-level, not automatically tied to one claim.
- Never bill a beneficiary merely because a payer did not pay.
Operational workflow
- 01Reconcile payment and adjustment amounts at line and claim level.
- 02Read group code, CARC, every RARC, and payer message.
- 03Classify as rejection, denial, reduction, patient responsibility, or provider-level adjustment.
- 04Route to correction, payer inquiry, reopening, appeal, refund, or contractual posting.
- 05Track the final root cause instead of only the code number.
Common failure modes
- Reading only the CARC.
- Posting every PR amount without checking notices and contract rules.
- Treating an adjustment as a denial requiring an appeal.
Knowledge check
Official sources
Continue this track
Education only. Verify the current code set, payer contract, coverage policy, implementation guide, and claim-specific facts. Do not enter protected health information into this site.