Verification for a Drug Enforcement Administration (DEA) number can be obtained from the National Technical Information Service (NTIS). The list of active DEA registrants is sold for a single, monthly or quarterly basis, according to the DEA Office of Diversion Control.
The DEA makes a list called the Controlled Substances Act (CSA) registration record wherein all individuals and businesses that are active, retired and suspended under the act are recorded. This list helps practitioners prove their credentials and CSA status as well as help patients verify the authenticity of the DEA numbers, states DEANumber.com.
The DEA assigns a DEA number to a health care practitioner to legally allow them to prescribe controlled substances, according to Wikipedia. The DEA number also helps track who prescribed and purchased the controlled substances.