DEA Number Verification in Pharmacy: Complete Guide

How to Verify DEA Numbers in the Pharmacy

Every prescriber authorized to prescribe controlled substances must have a valid Drug Enforcement Administration (DEA) registration number. As a pharmacy technician, knowing how to verify a DEA number is critical for detecting fraudulent prescriptions and ensuring compliance with federal law. This skill is also frequently tested on the PTCB exam.

Understanding DEA Number Structure

A DEA number consists of two letters followed by seven digits. Each component has a specific meaning and purpose. Understanding the structure helps you quickly identify potential issues with a prescription before applying the verification formula.

The first letter indicates the type of registrant:

• A, B, or F - Hospitals, pharmacies, practitioners, and other dispensers
• M - Mid-level practitioners (nurse practitioners, physician assistants)
• P or R - Manufacturers, distributors, researchers, and other registrants

The second letter is the first letter of the registrant's last name. For example, a physician named Dr. Smith would have a DEA number where the second letter is "S." For business entities, the second letter corresponds to the first letter of the business name.

The DEA Check Digit Verification Formula

The seven-digit portion of the DEA number contains a built-in check digit that allows pharmacies to mathematically verify authenticity. Here is the step-by-step process:

Step 1: Add the first, third, and fifth digits together.

Step 2: Add the second, fourth, and sixth digits together.

Step 3: Multiply the sum from Step 2 by 2.

Step 4: Add the results of Step 1 and Step 3.

Step 5: The last digit (ones place) of the sum from Step 4 should equal the seventh digit (check digit) of the DEA number.

DEA Verification Example

Let us verify the DEA number AS1234563 for a Dr. Smith:

First, check the letters: "A" indicates a practitioner (valid), and "S" matches the last name Smith (valid).

Now apply the formula to the digits 1234563:

• Step 1: Add digits 1, 3, 5 (positions 1, 3, 5): 1 + 3 + 5 = 9
• Step 2: Add digits 2, 4, 6 (positions 2, 4, 6): 2 + 4 + 6 = 12
• Step 3: Multiply Step 2 by 2: 12 x 2 = 24
• Step 4: Add Step 1 + Step 3: 9 + 24 = 33
• Step 5: The last digit of 33 is 3, which matches the seventh digit (3)

This DEA number is mathematically valid. If the check digit did not match, the number would be flagged as potentially fraudulent.

When to Verify DEA Numbers

Pharmacy technicians should verify DEA numbers in several situations:

• When receiving a new controlled substance prescription from an unfamiliar prescriber
• When a prescription appears suspicious or altered
• During the initial setup of a new prescriber in the pharmacy system
• When processing phone-in prescriptions for Schedule III through V medications
• As part of routine quality assurance and compliance checks

Limitations of DEA Number Verification

While the check digit formula confirms mathematical validity, it has important limitations. A mathematically valid DEA number does not guarantee that the prescriber is currently registered or authorized to prescribe. DEA registrations can be suspended, revoked, or expired. For complete verification, pharmacies should also check the DEA's online database or contact the DEA directly.

Additionally, a valid DEA number does not confirm that the prescriber is authorized to prescribe the specific schedule of controlled substance on the prescription. Some mid-level practitioners may have DEA numbers but face state-level restrictions on which controlled substances they can prescribe.

Handling Suspicious Prescriptions

If a DEA number fails verification, do not dispense the medication. Report the discrepancy to the pharmacist immediately. The pharmacist will determine the appropriate next steps, which may include contacting the prescriber's office, checking the DEA database, or reporting suspected fraud to the DEA.

Red flags that warrant extra scrutiny include prescriptions written on stolen or photocopied prescription pads, prescriptions for unusually large quantities of controlled substances, multiple controlled substance prescriptions from the same prescriber for the same patient, and prescriptions where the DEA number does not match the prescriber name.

PTCB Exam Preparation

The DEA check digit formula is one of the most commonly tested calculations on the PTCB exam. Practice with multiple examples until you can perform the verification quickly and accurately. Remember to also check the letter prefix rules, as the exam may test your knowledge of what each letter designation means.