Guess this is relevant and may help you - haven`t found anything else yet. Hopefully someone with more knowledge on the subject can help you further.
The DOT 5 panel drug screen is a screen for five classes of drugs. The test is mandated by the Department of Transportation to be given to employees of commercial driving companies. It has also been called the NIDA 5 and subsequently the SAMHSA 5 panels for the National Institute on Drug Abuse and the Substance Abuse and Mental Health Services Administration, respectively.
Additionally, take a look into attached documents
and this thread
The code 47643n seems some optional extra panel, as seen within the 1st document.