What the co-occurring assessment route means
Start with conditions borderline personality disorder, then review other mental health conditions. This route focuses on understanding when the co-occurring concept is relevant to a borderline personality disorder inquiry, while preserving the limits of the supplied evidence.
The central decision is whether the question concerns two disorder categories rather than borderline personality disorder alone. SAMHSA defines co-occurring disorders as the coexistence of a mental health disorder and a substance use disorder. This definition sets the evidence boundary for the route.
It does not establish that substance use automatically qualifies as a substance use disorder. It also does not describe a screening tool, assessment sequence, diagnosis, or care recommendation. The practical value is narrower. It helps people frame an inquiry around both categories and avoid treating any mention of substance use as proof of a co-occurring disorder.