What is the final step in determining the check digit of a DEA number?

The final step in determining the check digit of a DEA number involves identifying the last digit in the sum calculated from the DEA number's validation process. This check digit is essential for verifying the authenticity of a DEA number and ensuring it is properly issued.

To arrive at this check digit, a series of calculations are performed using the digits of the DEA number. Specifically, the first eight digits of the DEA number are manipulated through a defined algorithm that involves summation and some multiplications. After these steps, you arrive at a total that represents the sum of certain weighted values derived from the DEA number. The last step is to take the final sum and determine the check digit, which is simply the last digit of this total. This is crucial for the validity of the DEA number because it helps in detecting miswritten numbers, thereby helping to prevent prescription fraud or errors.

In summary, the correct answer emphasizes that the check digit is simply the last digit in the calculated sum, which is the culmination of all preceding steps in the verification process. Understanding this process is vital for pharmacy professionals, ensuring they can confirm the accuracy of DEA numbers as part of their responsibilities.