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CO-93 Denial Code (Deactivated): No Claim-Level Adjustments

CO-93 stated that there were no adjustments at the claim level. X12 deactivated it because, starting with version 004010 of the 835, the claim-level adjustment segment is optional, so a placeholder code was no longer needed.

X12 deactivated CARC93 on October 16, 2003. Payers should no longer use it on new remittances, but it can still appear on older ERAs, corrected claims, and appeals.

Code: CO-93 (CARC 93)
Status: Deactivated StoppedOctober 16, 2003 (in use since January 1, 1995).
Code set: Claim Adjustment Reason Codes (CARC)
Group codes: CO (Contractual Obligation): Used as a placeholder, with no dollar liability attached.
Official description: No Claim level Adjustments.
X12 Claim Adjustment Reason Codes, retrieved September 25, 2026
Last verified: September 24, 2026 against the official X12 list.

What CO-93 meant

The 835 can report adjustments at two levels: across the whole claim or on individual service lines. CARC 93 was a filler for the claim level, telling the provider there was nothing to report there. Any reductions would instead show on the lines.

What replaced it

Nothing replaced it. X12’s notes explain that as of version 004010, the claim-level adjustment (CAS) segment is optional. When there are no claim-level adjustments, the segment is simply left out. For context, the codes that most often appear on paid claims are line-level reductions such as CO-45. Codes used purely for reporting, like CO-246, serve a different purpose.

If you still see CO-93

It belongs to pre-004010 remittances, so it should only appear in very old archives or migrated history. There is nothing to correct and nothing to post. If your practice management system created a zero-dollar entry from it during a data conversion, you can suppress or ignore it as long as the claim’s balance is correct.

CO-45 (Charge exceeds fee schedule/maximum allowable or contracted/legislated fee arrangement.): The most common adjustment you will see at the line or claim level on paid claims.
CO-246 (This non-payable code is for required reporting only.): A non-payable code for required reporting only, another informational-style code.

CO-93 FAQ

Why did the 835 once need a no-adjustment code?

In earlier versions, the claim-level adjustment segment was expected to be present. If there was nothing to report, a code like 93 filled the slot. Making the segment optional removed that need.

Is CO-93 a problem?

No. It meant the opposite of a problem: nothing was adjusted at the claim level. Any line-level adjustments would still appear separately.

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