CARC 100: Payment made to patient/insured/responsible party.
Payment made to patient/insured/responsible party.
CARC 100 is the code your insurance company used to explain why your claim was reduced, denied, or paid less than expected. It appears on your Explanation of Benefits (EOB) — the statement your plan sends after a claim is processed. Here's what it means for you and what you can do about it.
What CARC 100 means
The official X12 description is: “Payment made to patient/insured/responsible party.”
In plain language: Payment made to patient/insured/responsible party.
What to do next 100
Verify the EOB details. If you believe the code is misapplied, contact the carrier's member services or your provider's billing office.
CARC 100 group codes explained
On the 835 ERA, CARC 100 appears alongside a group code that signals who is financially responsible for the adjustment. OA (Other Adjustment) — Informational or coordination-related adjustment. Usually means another payer is involved or there's a non-claim-related accounting entry.
Frequently asked questions
What does CARC 100 mean?
Payment made to patient/insured/responsible party. In plain language: Payment made to patient/insured/responsible party.
Is CARC 100 appealable?
CARC 100 is usually not appealable on its own — it's typically a contractual, informational, or routine adjustment. Verify the EOB details. If you believe the code is misapplied, contact the carrier's member services or your provider's billing office.
Which group code does CARC 100 appear under?
CARC 100 most often appears under: OA (Other Adjustment) — Informational or coordination-related adjustment. Usually means another payer is involved or there's a non-claim-related accounting entry.
What should I do if I see CARC 100 on the 835?
Verify the EOB details. If you believe the code is misapplied, contact the carrier's member services or your provider's billing office.
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Sources
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