Other psychotic disorder not due to a substance or known physiological condition (F28)

ICD-10 code F28 is used for diagnosing psychotic disorders that are not caused by substance use or other known physical health issues. It identifies conditions where psychosis occurs independently without a clear physiological or drug-related trigger.

This code covers disorders such as hallucinosis, a condition involving persistent hallucinations without the broader impairments seen in schizophrenia. By assigning F28, healthcare providers can specify that the psychotic symptoms arise from a psychiatric origin rather than substances or medical conditions. Using the term "other psychotic disorder not due to a substance or known physiological condition" helps clarify the diagnosis when symptoms don't fit more common psychotic disorders like schizophrenia. This makes it an important code for medical coders looking for the appropriate ICD-10 code for hallucinosis or similar psychotic presentations.