OBJECTIVE: To provide a rapid clinical update on casemix, average length of stay, and the effectiveness of Australian private psychiatric hospitals. METHODS: We conducted a descriptive analysis of the publicly available patient data from the Australian Private Hospitals Association Private Psychiatric Hospitals Data Reporting and Analysis Service website, from 2015-2016 to 2019-2020. This was compared with corresponding reporting on public and private hospitals from the Australian Institute of Health and Welfare, and Australian Mental Health Outcomes and Classification Network. RESULTS: In 2019-2020, there were 72 private psychiatric hospitals in Australia with 3582 acute beds. There were 42,942 inpatients with 1,286,470 days of care, and a mean length of stay 19.6 days (SD 13.9) for the financial year 2019-2020. The main diagnoses were major affective and other mood disorders (49%), and alcohol and other substance abuse disorders (21%). Clinician-rated outcome measures, that is, the HoNOS, showed an improvement effect size of 1.64, while the patient-rated MHQ-14 showed an improvement effect size of 1.18. Results are similar for previous years. CONCLUSIONS: Private psychiatric hospitals provide substantial, effective psychiatric care.