How can you verify the validity of a DEA number?

Verifying the validity of a DEA number involves a systematic approach that assesses whether the number conforms to specific check digit calculations. The correct method entails a series of steps that include adding the numbers in specified positions, multiplying selected digits by two, and ultimately comparing sums with the last digit of the DEA number.

The last digit of the total derived from the calculations should match the last digit of the DEA number itself. This process ensures that the DEA number provided is legitimate and can be used safely. If this check is consistent, it confirms that the DEA number is valid, which is crucial for legal prescriptions and controlled substances management in pharmacies.

In contrast, while the first, third, and fifth digits are summed, and the second, fourth, and sixth digits are multiplied by two, these processes alone do not confirm validity without the final step of comparing the total's last digit to the DEA number's last digit. Therefore, each of these steps contributes to the overall validation process, culminating in validating that the last digit of your calculated total aligns with the provided DEA number.