Where do you add a zero in the NDC?

Where do you add a zero in the NDC?

• A. Leading
• B. Trailing
• C. In the middle
• D. Not allowed to add a zero

Answer: (A)

The NDC is standardized to 11 digits by padding with a zero at the front of the segment that needs it. This means you place the zero in the leading position of the appropriate part to reach a 5-4-2 structure. For example, a 4-4-2 NDC gets a leading zero on the first segment, a 5-3-2 NDC gets one on the middle segment, and a 5-4-1 NDC gets one on the last segment. In all cases, the zero is added at the front of the relevant segment, not at the end or in the middle. So the correct placement is the leading position.

The NDC is standardized to 11 digits by padding with a zero at the front of the segment that needs it. This means you place the zero in the leading position of the appropriate part to reach a 5-4-2 structure. For example, a 4-4-2 NDC gets a leading zero on the first segment, a 5-3-2 NDC gets one on the middle segment, and a 5-4-1 NDC gets one on the last segment. In all cases, the zero is added at the front of the relevant segment, not at the end or in the middle. So the correct placement is the leading position.