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In a DEA (Drug Enforcement Administration) number, the check digit is the last digit of the sequence. The correct digit is critical in verifying the validity of the DEA number to prevent fraudulent use. The check digit is calculated using a specific formula that involves the sum of certain digits in the DEA number.
To derive it, the odd-positioned digits are summed together, multiplied by 2, and then the even-positioned digits are added to this result. Finally, the total is used to determine the check digit, which is the last digit of this total, rounded to the nearest ten.
In this context, the focus is on how the check digit is crucial for ensuring the integrity and verification of the DEA number, reinforcing accountability in prescribing and dispensing controlled substances.