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CO-D4 Denial Code (Deactivated): Period of Need Missing

CO-D4 meant the claim did not indicate the period of time for which the service or item would be needed. X12 deactivated it and directs payers to CARC 16 with remark codes, such as M125.

X12 deactivated CARCD4 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-D4 (CARC D4)
Status: Deactivated StoppedOctober 16, 2003 (in use since January 1, 1995).
Code set: Claim Adjustment Reason Codes (CARC)
Group codes: CO (Contractual Obligation): The provider or supplier needed to add the duration; the patient was not billed for the denial.
Official description: Claim/service does not indicate the period of time for which this will be needed.
X12 Claim Adjustment Reason Codes, retrieved September 25, 2026
Last verified: September 24, 2026 against the official X12 list.

What CO-D4 meant

CARC D4 targeted claims that needed an expected duration. For rented equipment and ongoing supplies, the payer decides coverage partly on how long the patient will need the item. When the claim left that out, the payer denied it as incomplete.

What replaced it

X12 says to use code 16 with remark codes. Today that looks like CO-16 with remark M125, which calls out missing information on the period of time the item or service will be needed. When the payer has the duration but disagrees with it, CO-152 applies instead.

If you still see CO-D4

It will only appear in historical DME or supply claims. For a current missing-duration denial, check the physician’s order for a stated length of need. If the order lacks one, ask the prescriber to complete it, then add the duration to the claim and resubmit. Keeping the order and its length of need in the patient’s file also helps with later audits.

CO-16 (Claim/service lacks information or has submission/billing error(s).): Named replacement: claim lacks information, used with a remark code.
M125 (Missing/incomplete/invalid information on the period of time for which the service/supply/equipment will be needed.): Remark code for missing information on how long the service, supply, or equipment will be needed.
CO-152 (Payer deems the information submitted does not support this length of service.): Used when the length of service is reported but not supported.

CO-D4 FAQ

Which claims need a period of need?

Typically rentals and ongoing supplies, such as durable medical equipment, where the payer's coverage depends on how long the item is medically required.

Where does the period of need come from?

From the prescriber's order, which usually states the expected length of need. The supplier transfers it to the claim in the format the payer requires.

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