Look up another code

CO-D9 Denial Code (Deactivated): Lens Invoice Missing

CO-D9 meant the claim lacked an invoice or statement certifying the actual cost of the lens, less discounts, or the type of intraocular lens used. X12 deactivated it and directs payers to CARC 16 with remark codes, such as M130.

X12 deactivated CARCD9 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-D9 (CARC D9)
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 needed to supply the invoice or lens information; the patient was not billed for the denial.
Official description: Claim/service denied. Claim lacks invoice or statement certifying the actual cost of the lens, less discounts or the type of intraocular lens used.
X12 Claim Adjustment Reason Codes, retrieved September 25, 2026
Last verified: September 24, 2026 against the official X12 list.

What CO-D9 meant

CARC D9 applied to claims for lenses, including intraocular lenses used in cataract surgery. The payer wanted either an invoice showing what the provider actually paid for the lens after discounts, or information on the type of lens used. Without it, the claim was denied.

What replaced it

X12’s note says to use code 16 with remark codes. Current remittances show CO-16 with remark M130 when the invoice or lens type is missing, or with N231 when it was sent but was incomplete or invalid.

If you still see CO-D9

It will only appear on older eye care or surgical claims. For a similar denial now, pull the supplier invoice for the lens, make sure it shows the net cost after any discounts, and send it with the claim through the payer’s attachment process. Add the lens type if the payer requires it.

CO-16 (Claim/service lacks information or has submission/billing error(s).): Named replacement: claim lacks information, used with a remark code.
M130 (Missing invoice or statement certifying the actual cost of the lens, less discounts, and/or the type of intraocular lens used.): Remark code for a missing lens invoice or intraocular lens type.
N231 (Incomplete/invalid invoice or statement certifying the actual cost of the lens, less discounts, and/or the type of intraocular lens used.): Remark code for an incomplete or invalid lens invoice or statement.

CO-D9 FAQ

Why did payers need a lens invoice?

Some lenses were paid based on the provider's actual cost. The invoice, net of discounts, documented that cost, and the lens type helped the payer apply the right payment rule.

What should the invoice show?

The lens description or type, the price paid, and any discounts applied, so the payer can see the true net cost.

Important: read before using this information

This page is general educational information about a standard industry code set. It is not medical billing, coding, legal, reimbursement, or compliance advice, and it does not create a professional or advisory relationship with ClaimsRevenue.

Code definitions, payer usage, contracts, and laws change, and payers may apply the same code differently. The information is provided “as is,” without warranties of any kind, express or implied, including accuracy, completeness, or currency. You are solely responsible for verifying it against the current official X12 code lists, CMS guidance, your payer contracts, and payer policies before relying on it, and for every billing, coding, collection, and appeal decision you make.

Using this information does not guarantee that any claim will be paid or that any appeal will succeed. To the fullest extent permitted by law, ClaimsRevenue and MOODRX LLC are not liable for any loss or damage arising from its use. Official code descriptions are published by X12 and are quoted for reference only. See our full Claims Validation Disclaimer.