The Australian Standard Classification of Drugs of Concern (ASCDC) provides a number of supplementary codes that have specific uses and these are detailed within the ASCDC, e.g. 0000 = inadequately described.

Other supplementary codes that are not already specified in the ASCDC may be used in National Minimum Data Sets (NMDS) when required. In the Alcohol and other drug treatment service NMDS, two additional supplementary codes have been created which enable a finer level of detail to be captured:

CODE 0005     Opioid analgesics not further defined

This code is to be used when it is known that the client's principal drug of concern is an opioid but the specific opioid used is not known. The existing code 1000 combines opioid analgesics and non-opioid analgesics together into Analgesics nfd and the finer level of detail, although known, is lost.

CODE 0006     Psychostimulants not further defined 

This code is to be used when it is known that the client's principal drug of concern is a psychostimulant but not which type. The existing code 3000 combines stimulants and hallucinogens together into Stimulants and hallucinogens nfd and the finer level of detail, although known, is lost.

Psychostimulants refer to the types of drugs that would normally be coded to 3100-3199, 3300-3399 and 3400-3499 categories plus 3903 and 3905.