What does the second set of four numbers in the NDC specify?

The second set of four numbers in the National Drug Code (NDC) identifies the specific drug product. This portion of the NDC is critical because it designates the formulation, strength, and dosage form of the medication.

In the NDC format, the first set of numbers generally represents the labeler or manufacturer of the drug, indicating which company produces it. The second set, however, uniquely identifies the distinct product itself, differentiating it from other products made by the same manufacturer. This differentiation can be vital for pharmacies, healthcare providers, and patients to accurately recognize and dispense the correct medication as per prescriptions.

Understanding this aspect of the NDC is essential in pharmacy practice to ensure proper medication management, avoid potential medication errors, and facilitate accurate billing and inventory processes.