FPGEE for National Association of Boards of Pharmacy (NABP) Practice Exam 2026 - Free NABP Practice Questions and Study Guide

The calculation of a DEA (Drug Enforcement Administration) number involves specific components to verify its validity. The correct answer emphasizes the importance of summing the digits located in the odd positions of the DEA number, which is a crucial part of the check digit formula used to determine if the number is legitimate.

In constructing a DEA number, the first letter indicates the type of registrant (for example, 'A' or 'B' for physicians), the second letter typically represents the first letter of the registrant's last name, and the next digits form a unique identifier. The calculation uses the digits in the odd positions for the first step because they have a distinct weight in maintaining the integrity and validity of the DEA number.

This sum, when used in conjunction with the sum of the even-position digits—multiplied by two—contributes to calculating the final check digit that verifies whether the DEA number is valid. This check digit is the last digit of the DEA number and is essential for preventing misuse or fraudulent registration.

Thus, the requirement to sum only the odd-position digits is foundational to calculating the initial check and ensuring the entire DEA number conforms to the expected pattern.