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Which part of the NDC number indicates the manufacturer of a drug?

A The first 4–5 digits.

The labeler code is the first segment. It is 4–5 digits and identifies the manufacturer. The product code is the second segment and is 3–4 digits long. It identifies the formulation, strength, and dosage. The package code is the third segment. It is 1–2 digits and identifies the package forms and sizes.