CARC221ReferenceHistorical / DeactivatedVerified Aug 15, 2026

CARC 221

Historical / Deactivated code: Heads up

CARC 221 is no longer valid for current transactions. It may still appear on older remittance advices — treat it as reference for historical documents only.

No specific AR Guide workflow has been assigned yet

We haven’t written AR Guide guidance for CARC 221 yet. The reference description in the sidebar is complete and sourced from ASC X12. Search the denial guides for the workflow you need.

Reference

Reference details

Code: 221
X12 status: Deactivated
Effective: Jan 27, 2008
Last modified: Jul 1, 2013
Deactivated: Jul 1, 2014

Reference

Reference description

Claim is under investigation. Note: If adjustment is at the Claim Level, the payer must send and the provider should refer to the 835 Insurance Policy Number Segment (Loop 2100 Other Claim Related Information REF qualifier 'IG') for the jurisdictional regulation. If adjustment is at the Line Level, the payer must send and the provider should refer to the 835 Healthcare Policy Identification Segment (loop 2110 Service Payment information REF). (Note: To be used by Property & Casualty only)

External reference text from ASC X12. AR Guide does not alter official descriptions.

Source & review

Data quality

Source: ASC X12 Claim Adjustment Reason Codes
Verify: Open source page ↗
Last checked: Aug 15, 2026
Status: Verified

Denial Decoder

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Enter CARC 221 (plus the group code and any RARC from your ERA/EOB) and get a practical AR workflow.

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