A valid DEA number consists of 2 letters, 6 digits, and 1 check digit. The first letter is a code identifying the type of registrant. The second letter is the first letter of the registrant’s last name.
Here are the steps to verify a DEA number:
Step 1: Add the first, third, and fifth digits of the DEA number.
Step 2: Add the second, fourth, and sixth digits of the DEA number.
Step 3: Multiply the result of Step 2 by two.
Step 4: Add the result of Step 1 to the result of Step 3.
Then, the last digit of this sum must be the same as the last digit of the DEA number.
Example: DEA number AP5836727
Step 1: 5 + 3 + 7 = 15
Step 2: 8 + 6 + 2 = 16
Step 3: 16 * 2 = 32
Step 4: 15 + 32 = 47
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