Both are outpatient, but they're not the same level of care. Here's how partial hospitalization and intensive outpatient compare.
The difference between PHP and IOP is intensity. A partial hospitalization program (PHP) is the more intensive outpatient level — typically around 20 or more hours of clinical programming per week, often five to six days a week. An intensive outpatient program (IOP) is less intensive — commonly around 9 to 15 hours per week across about three days. Both let clients live at home; PHP sits just below residential care, and IOP is a step down from PHP.
| PHP (Partial Hospitalization) | IOP (Intensive Outpatient) | |
|---|---|---|
| Intensity | Higher — just below residential | Lower — a step down from PHP |
| Typical hours | ~20+ hours/week, ~5–6 days | ~9–15 hours/week, ~3 days |
| Lives at home? | Yes | Yes |
| Best for | Clients needing structured daily support without 24-hour care | Clients stable enough for part-time structure, often stepping down |
Treatment is usually a continuum. A client might begin in residential or detox, step down to PHP for structured daily support, then step down again to IOP as they stabilize, and finally to standard outpatient. Offering more than one level of care lets a program keep clients through that journey rather than discharging them — but each level carries its own licensing, staffing, and clinical requirements.
The difference is intensity. A partial hospitalization program (PHP) is more intensive — around 20 or more hours of programming per week, often five to six days. An intensive outpatient program (IOP) is less intensive — about 9 to 15 hours per week across roughly three days. Both let clients live at home.
Yes. PHP is the more intensive outpatient level of care, sitting just below residential treatment, while IOP is a step down from PHP with fewer weekly hours.
Yes. Treatment is typically a continuum — clients often move from residential or detox to PHP, then step down to IOP as they stabilize, and finally to standard outpatient care.
Yes. Each level of care carries its own licensing, staffing, and clinical requirements, and accreditation is typically required to bill insurance for either.
Partial hospitalization, the day-treatment level of care.
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