DEA Number Check-Digit: How It Works and How to Validate
A walkthrough of the DEA check-digit algorithm with a step-by-step example you can verify by hand. Not a registry lookup.
Article content
The DEA number includes a simple checksum to catch transposition and entry errors. It is not a registry lookup. It only checks the internal math.
The algorithm
- Add the 1st, 3rd, and 5th digits.
- Add the 2nd, 4th, and 6th digits, then multiply that sum by 2.
- Add the two results. The rightmost digit of this total must equal the 7th digit, the check digit.
Worked example
Example: AB1234567. The letters are ignored.
- Odd positions: 1 + 3 + 5 = 9
- Even positions: 2 + 4 + 6 = 12, then 12 times 2 = 24
- Total: 9 + 24 = 33, so the rightmost digit is 3
- The check digit provided is 7, which does not match. It would match if the last digit were 3.
Common mistakes
- Using the letters in the math. Only digits 1 through 6 participate.
- Doubling the wrong side. Only the even-position sum is doubled.
- Treating a valid checksum as proof the license exists or is active.
Try the tool
Check a number with the DEA check-digit tool before it flows into an order.
Context for MedTech teams
This topic shows up every week in vendor management and perioperative coordination. The short version: make it easy for qualified reps to support cases while maintaining airtight compliance and safety guardrails. Align hospital policy with your credentialing workflow, keep training and immunization evidence current, and close the last‑mile gap between your credentialing system and the OR desk.
If you are rolling out updates across facilities, standardize the “source of truth” for rep status, implement pragmatic exception handling, and partner early with IT and legal on privacy and device security. Those moves reduce day‑of‑surgery friction and help you demonstrate audit‑ready controls.
Further reading
For deeper context on credentialing, OR access, and validation, explore these resources: