In a DEA registration number, the first letter identifies the type of registration.

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Multiple Choice

In a DEA registration number, the first letter identifies the type of registration.

The first character of a DEA registration number encodes what kind of registrant earned that authorization. It tells you the category of registration, not the prescriber’s name, the location, or the drug schedule. That’s why identifying the type of registration is the correct idea. In practice, different first letters map to different registrant types—for example, mid-level practitioners often have a first letter M, and physicians with a special opioid-addiction treatment waiver can have an X at the start. The remaining characters provide a unique identifier for that specific registration.

The first character of a DEA registration number encodes what kind of registrant earned that authorization. It tells you the category of registration, not the prescriber’s name, the location, or the drug schedule. That’s why identifying the type of registration is the correct idea. In practice, different first letters map to different registrant types—for example, mid-level practitioners often have a first letter M, and physicians with a special opioid-addiction treatment waiver can have an X at the start. The remaining characters provide a unique identifier for that specific registration.

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