Frequently Asked Questions
Converting 10-digit NDC Numbers to 11 Digits
Many NDCs are displayed on drug packaging in the 10 digit format. However, when entering an NDC number on a bill, the NDC must be 11 digits. No sweat – it’s just a matter of adding a well-placed zero. Our guide below shows you how to convert 10-digit National Drug Code (NDC) numbers to 11 digits.
Converting NDCs from a 10-digit to an 11-digit format requires placing the zero in the correct location based on the 10-digit format.
- For a 10 digit NDC in the 4-4-2 format, add a 0 in the 1st position.
- For a 10 digit NDC in the 5-3-2 format, add a 0 in the 6th position.
- For a 10 digit NDC in the 5-4-1 format, add a 0 in the 10th position.
In table form:
In the examples below, the additional zero is bolded:
0574-4072-05 → 00574-4072-05
51655-089-52 → 51655-0089-52
58118-1397-3 → 58118-1397-03
Important: The hyphens you see in this guide are only used to illustrate the NDC format. When including an NDC on a bill, DO NOT use hyphens.
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