In this study, Queensland Suicide Register data were compared to the usual official source – the Australian Bureau of Statistics. Queensland Suicide Register deaths were coded as beyond reasonable doubt, probable, & possible. These categories were analysed by methods & demographic variables to determine the nature of difficult-to-classify suicides. Queensland Suicide Register suicides exceed the Australian Bureau of Statistics suicides expecially for females, ages 25-44, & the methods overdose, drowning, & “other methods”. Opiate overdoses were most difficult to code. Ambiguous circumstantial information & unclear intent were major impediments. (16 refs.)