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CO-D22 Denial Code (Deactivated): Reason in Correspondence

CO-D22 meant a workers' compensation payer adjusted reimbursement for reasons it would explain in separate correspondence. It was created as a temporary code, and X12 deactivated it without naming a direct successor.

X12 deactivated CARCD22 on January 1, 2009. Payers should no longer use it on new remittances, but it can still appear on older ERAs, corrected claims, and appeals.

Code: CO-D22 (CARC D22)
Status: Deactivated StoppedJanuary 1, 2009 (in use since January 27, 2008).
Code set: Claim Adjustment Reason Codes (CARC)
Group codes: CO (Contractual Obligation): The adjustment stayed with the provider pending the payer's written explanation.
Official description: Reimbursement was adjusted for the reasons to be provided in separate correspondence. (Note: To be used for Workers' Compensation only) - Temporary code to be added for timeframe only until 01/01/2009. Another code to be established and/or for 06/2008 meeting for a revised code to replace or strategy to use another existing code
X12 Claim Adjustment Reason Codes, retrieved September 25, 2026
Last verified: September 24, 2026 against the official X12 list.

What CO-D22 meant

CARC D22 was used only for workers’ compensation. It told the provider that reimbursement was adjusted, but the reason would be explained in a separate letter rather than on the remittance. The official description openly calls it a temporary code meant to bridge a short period while a permanent approach was worked out.

What replaced it

X12 did not name a single successor. Workers’ compensation adjustments are now reported with specific codes in the property and casualty P-series, including CO-P13 for jurisdictional regulations or payment policies, CO-P12 for fee schedule adjustments, and CO-P15 for medical treatment guideline adjustments. These put the reason on the remittance itself.

If you still see CO-D22

It will be in older workers’ compensation files only. If you are still resolving such a claim, locate the payer’s correspondence, which holds the actual reason. Without it, request a copy from the adjuster, then decide whether to accept the adjustment or dispute it under the state’s workers’ compensation process.

CO-P13 (Payment reduced or denied based on workers' compensation jurisdictional regulations or payment policies, use only if no other code is applicable.): Reduced or denied based on workers' compensation jurisdictional regulations or payment policies.
CO-P12 (Workers' compensation jurisdictional fee schedule adjustment.): Workers' compensation jurisdictional fee schedule adjustment.
CO-P15 (Workers' Compensation Medical Treatment Guideline Adjustment.): Workers' compensation medical treatment guideline adjustment.

CO-D22 FAQ

Why was CO-D22 temporary?

Its official text describes it as a stopgap while X12 decided whether to create a revised code or rely on existing codes. Workers' compensation codes were later organized into the P-series.

What should I do if the correspondence never arrived?

Contact the adjuster and request the written explanation of the adjustment, including the rule or fee schedule applied.

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