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N848 Remark Code: NDC Not Linked to Any Product

N848 means the National Drug Code (NDC) billed can't be associated with a product. The payer looked the number up and found no matching drug, which usually means a formatting error, a typo, or a code that isn't in the payer's drug file.

Quick facts

Code
N848 (RARC N848)
Status
Active In use since March 1, 2021.
Code set
Remittance Advice Remark Codes (RARC)
Group codes
  • CO (Contractual Obligation): The drug line was denied because the product couldn't be identified. It's the provider's to correct.
Official description
National Drug Code (NDC) billed cannot be associated with a product.
X12 Remittance Advice Remark Codes, retrieved September 25, 2026
Last verified
against the official X12 list.

What N848 means

N848 is what a payer reports when an NDC lookup comes back empty. Unlike N847, where the code is recognized but outdated, or N846, where it’s valid but paired with the wrong HCPCS code, N848 means the number doesn’t lead to any product the payer knows.

Most of the time the drug is fine and the problem is the number itself. The line typically comes back with CARC 16.

Common causes

  • 10-to-11-digit conversion errors. Package NDCs use 4-4-2, 5-3-2, or 5-4-1 formats. The claim needs 5-4-2, created by adding a leading zero to the short segment. A zero in the wrong segment creates a nonexistent code.
  • Typos or transposed digits during manual entry.
  • Hyphens, spaces, or the N4 qualifier entered as part of the number.
  • Internal item numbers or supplier catalog numbers entered in the NDC field.
  • New products not yet loaded in the payer’s drug database.

How to fix it

  1. Read the NDC from the package of the product actually given.
  2. Convert it correctly to the 11-digit 5-4-2 format, putting the leading zero in the short segment.
  3. Verify it against a current drug reference to confirm it identifies the product.
  4. Submit a corrected claim with the fixed NDC and resubmission code 7 in box 22.
  5. If the NDC is correct, ask the payer to add or review the product.

How to prevent it

  • Store NDCs in 11-digit format in your drug master, converted once and verified.
  • Scan package barcodes rather than typing NDCs where your systems allow.
  • Run drug claims through Claims Validator to flag NDCs with invalid structure.

Codes that may appear with N848

  • CO-16 (Claim/service lacks information or has submission/billing error(s).): A billing error; N848 says the NDC doesn't identify a product.
  • M119 (Missing/incomplete/invalid/ deactivated/withdrawn National Drug Code (NDC).): The NDC is missing, invalid, deactivated, or withdrawn.
  • N847 (National Drug Code (NDC) billed is obsolete.): The NDC is recognized but obsolete.
  • N816 (Missing/Incomplete/Invalid NDC Unit of Measure): The NDC unit of measure is missing or invalid.

N848 FAQ

Why does the 11-digit format matter?

NDCs on packages come in 10-digit formats with different segment lengths. Claims require an 11-digit 5-4-2 format, made by adding a leading zero to the short segment. Adding the zero in the wrong place creates a different number that may match nothing.

Should I include hyphens?

Generally no. Most payers want the 11 digits without hyphens or spaces on claims. Check the payer's instructions.

What if the NDC is correct and still rejected?

The product may be new or missing from the payer's drug file. Contact the payer with product details and ask it to review.