CARC18ReferenceCurrentVerified Aug 15, 2026CARC 18
AR Guide Workflow
Duplicate Claims
The payer identified the claim as a duplicate of a previously processed claim. Verify the original before doing anything — this is often a no-action item.
AR Guide explanation
What it means
The payer identified the claim as an exact duplicate of a claim/service already processed.
AR Guide knowledge
Common denial category
Duplicate Claims — The payer identified the claim as a duplicate of a previously processed claim. Verify the original before doing anything — this is often a no-action item.
AR Guide knowledge
Common causes
- Same claim submitted twice
- Corrected claim sent as a new claim instead of a replacement
- Duplicate line items on one claim
AR Guide knowledge
What AR should verify
- Search for the prior claim using the same dates of service and charges
- Confirm whether the original claim was already paid
- Check if this was meant to be a corrected/replacement claim
AR Guide knowledge
Recommended action
- If it is truly a duplicate, no appeal is needed — confirm the original was handled correctly
- If it is a corrected claim, resubmit with the correct replacement indicator
AR Guide knowledge
QA checkpoint
- Use a claim scrubber that detects duplicates before submission
- Train staff on replacement vs. new claim submission
About this guidance: Note
AR Guide knowledge is general reference content written by our team — it is not payer-specific policy and never replaces the payer’s documentation or your contract. Always confirm specifics with the payer.