National Drug Code
Drug products are identified and reported using a unique, three-segment number, called the National Drug Code (NDC), which serves as a universal product identifier for human drugs. FDA publishes the listed NDC numbers and the information submitted as part of the listing information in the NDC Directory.
Valid formats for GCAPI use expressed as a regular expression:
0074-3727-13 0074-3727 66715-9710-2 66715-9710