0002-7510-01 is already written with its leading zero visible in FDA data; stripped of hyphens it becomes 0002751001, which is why conversion must work from the segmented form.
A 10-digit NDC with a four-digit labeler code; the leading zero goes into the first segment.
0002-7510-01 is already written with its leading zero visible in FDA data; stripped of hyphens it becomes 0002751001, which is why conversion must work from the segmented form.