In the NDC format, how many digits identify the drug?

The National Drug Code (NDC) format consists of three segments: the labeler code, the product code, and the package code. The labeler code, which identifies the manufacturer or distributor of the drug, is typically made up of 4 or 5 digits. In the context of the question, when referring specifically to how many digits identify the drug, the correct focus is on the product code, which is part of the NDC.

The product code is used to identify the specific formulation, strength, and dosage form of the drug. This section can be 3 or 4 digits long, depending on the NDC format in use. However, it is crucial to note that in the most widely used NDC format, the product code often comprises 4 digits. Therefore, in this scenario, indicating that 4 digits identify the drug is indeed the correct interpretation based on the established NDC format where 4 digits represent a significant component of the drug identification.

Thus, understanding the structure of the NDC is key, and knowing that the product code generally includes 4 digits solidifies the rationale for the correct answer.