Partial Hospitalization Program (PHP) rehab is a type of outpatient treatment program that is intensive and supervised for... morePartial Hospitalization Program (PHP) rehab is a type of outpatient treatment program that is intensive and supervised for people who are addicted to drugs and/or alcohol. PHP is a level of care that is similar to partial inpatient treatment and supervision but does not require continuous hospitalization. Its primary goal is to tailor the treatment plan to the specific needs of each client.