FDA Healthcare Standard
The 11-Digit NDC Barcode Guide
Master the pharmaceutical coding required for US pharmacy billing, HIPAA compliance, and drug distribution.
What is an NDC?
The National Drug Code (NDC) is a unique three-segment number assigned by the FDA to identify drugs intended for human use. While the FDA assigns 10-digit codes, healthcare billing systems and regulatory standards require a normalized 11-digit format.
11-Digit Normalization
Pharmaceutical manufacturers must convert their 10-digit FDA code into an 11-digit number by adding a leading zero to one of the segments. The placement depends on the original pattern:
| Original (10) | Normalized (11) | Rule |
|---|---|---|
| 4-4-2 | 0XXXX-XXXX-XX | Add zero to Labeler Code |
| 5-3-2 | XXXXX-0XXX-XX | Add zero to Product Code |
| 5-4-1 | XXXXX-XXXX-0X | Add zero to Package Code |
Digital Representation
In the US, NDCs are typically rendered on packaging using the Code 128 symbology. For specialized clinical tracking on tiny vials or unit doses, they may also be encoded into GS1 DataMatrix 2D codes.
Technical Specs
Target LengthExactly 11
Segments3 (Label/Prod/Pkg)
SymbologyCode 128
ComplianceFDA & HIPAA
Billing Accuracy
The 11-digit normalized code is the mandatory standard for all electronic healthcare transactions and insurance claims in the United States.