CARC 211 Active

CO-211: NDC Not Eligible for Rebate / Not Covered

TL;DR

NDC not rebate-eligible. Provider absorbs cost. Fix the NDC or obtain prior authorization and resubmit.

Action

Verify & Resubmit

Who Pays

Provider

Appeal

Yes

Patient Impact

None

Disclaimer

This content is for informational purposes only and does not constitute professional billing advice. Always verify information against your payer contracts and current coding guidelines. Consult a certified billing specialist for specific claim issues.

What Does CO-211 Mean?

CO-211 means the NDC is not rebate-eligible and the provider must absorb the cost. This typically occurs when the pharmacy dispenses a non-formulary drug without prior authorization or when an incorrect NDC is billed. The patient cannot be billed for this adjustment.

CARC 211 is a pharmacy-specific denial that ties drug coverage to rebate eligibility. Payers negotiate rebate agreements with drug manufacturers, and drugs outside these agreements are flagged as non-covered when billed under this code. If the NDC is not on the payer's rebate-eligible list, the claim is rejected.

This code surfaces in two distinct scenarios. First, data entry errors — an incorrect NDC, an outdated product code, or a discontinued drug identifier triggers the denial even though the actual drug dispensed may be covered. Second, genuine formulary exclusions — the drug is not on the payer's covered formulary because no rebate agreement exists for it.

The resolution path depends on which scenario applies. For data errors, correct the NDC and resubmit. For formulary exclusions, the options are switching to a covered alternative, requesting prior authorization for the non-formulary drug, or filing a formulary exception with medical necessity documentation. When paired with PR, the patient may need to pay out-of-pocket or switch medications.

Common Causes

Cause	Frequency
NDC not on payer's approved drug list The National Drug Code billed is not on the payer's formulary or approved drug list, meaning it does not qualify for rebate agreements between the payer and manufacturer	Most Common
Incorrect NDC code on claim Typographical errors, outdated NDC numbers, or discontinued drug codes were submitted, causing the payer to reject the claim as non-rebatable	Most Common
Drug requires prior authorization not obtained The drug requires prior authorization before dispensing, but the authorization was not completed or approval was not obtained	Common
Non-formulary or experimental drug The drug is experimental, FDA-unapproved for the billed indication, or not included in the payer's covered formulary	Common
Quantity or frequency limits exceeded The amount of drug billed exceeds the maximum allowable quantity or frequency limits set by the insurance plan	Common
Billing errors in NDC-related fields Incorrect units, dosage, or associated billing codes for the drug caused the claim to be flagged as ineligible for rebate	Occasional

How to Resolve

Verify the NDC accuracy against the payer's formulary, correct any coding errors, and either resubmit or pursue a formulary exception.

Verify the NDC code Check whether the billed NDC matches the actual drug dispensed. Correct any typographical errors or outdated codes.
Check rebate eligibility Verify the NDC against the payer's rebate-eligible drug list. If the drug is not listed, determine if prior authorization or a formulary exception is available.
Pursue coverage pathway Either resubmit with the correct NDC, obtain prior authorization, or submit a formulary exception with medical necessity documentation.

Common RARC Pairings

The RARC code tells you exactly what triggered the CO-211:

RARC	Description
N587	This National Drug Code (NDC) is not eligible for rebate. Verify the NDC against the payer's rebate-eligible drug list →
N130	Consult plan benefit documents or contact the payer for coverage information. Check the payer's formulary →

How to Prevent CO-211

Maintain an updated database of each payer's rebate-eligible NDCs
Implement NDC validation in the pharmacy system before dispensing
Verify prior authorization requirements for specialty and non-formulary drugs
Train pharmacy staff to check NDC codes against the payer's approved list before billing

General Prevention

Maintain an up-to-date database of payer formularies and rebate-eligible NDC codes
Implement NDC validation in the pharmacy management system before dispensing
Verify prior authorization requirements for high-cost or specialty drugs before dispensing
Use appropriate modifiers when billing drugs that may have special coverage conditions

Also Filed As

The same CARC 211 may appear with different Group Codes:

PR-211

Related Denial Codes

CO-19 — Workers' Compensation Claim CO-20 — Liability Carrier Responsible CO-21 — No-Fault Carrier Responsible CO-22 — Care Covered by Another Payer (COB) CO-26 — Expenses Incurred Prior to Coverage

Sources

https://www.mdclarity.com/denial-code/211
https://x12.org/codes/claim-adjustment-reason-codes
Codes maintained by X12. Visit x12.org for official definitions.