All denial codes Back to library
CARC Code Reference

CARC 166: These services were submitted after this payers responsibility for processing claims under this plan ended.

These services were submitted after this payers responsibility for processing claims under this plan ended.

Group code CO, PI or PR
Category Coordination of Benefits
Risk level High
Appealable No

See the full resolution workflow for CARC 166

Members of the EDI-Code Intelligence Lab get the step-by-step rework path, appeal language, root-cause drivers, and prevention checklist for every CARC and RARC pairing, plus payer-specific requirements.

Open in EDI Lab