Acute level of psychiatric treatment normally provided for 4 or more hours per day. Normally includes group therapies and activities with homogeneous patient populations. Is used as a referral step-down from inpatient care or as an alternative to inpatient care. Unlike intensive outpatient or simple outpatient services, PHP provides an attending psychiatrist, onsite nursing and social work. Reimbursed by payers at a rate that is roughly one half of inpatient psychiatric hospitalisation day rate. Patients do not spend the night at the partial hospital.