Question: how long are ndc numbers?
Answer: The NDC will be in one of the following configurations: 4-4-2, 5-3-2, or 5-4-1. Since the NDC is limited to 10 digits, a firm with a 5 digit labeler code must choose between a 3 digit product code and 2 digit package code, or a 4 digit product code and 1 digit package code.