What's the difference between IOP and PHP?

The main difference is intensity. A partial hospitalization program (PHP) meets most days of the week for several hours a day. An intensive outpatient program (IOP) meets a few days a week for about three hours at a time. Both let you live at home, but PHP involves many more treatment hours each week.

What is a partial hospitalization program (PHP)?

A PHP is the most intensive form of outpatient care — sometimes called "day treatment." You attend the program for most of the day, commonly five to seven days a week and roughly five to six hours per session, then go home each evening. It delivers a level of structure close to residential treatment without the overnight stay.

PHP days usually include individual therapy, group counseling, psychiatric or medical check-ins, medication management, and skills training. It's often used as a step down from inpatient rehab or right after detox, and it suits people who need a lot of support but have a stable, safe place to sleep at night.

What is an intensive outpatient program (IOP)?

An IOP is a step down in intensity from PHP. It typically meets three to five days a week for about three hours per session, often with evening options so people can keep working or caring for family. Over a week, that usually adds up to nine to twelve hours of structured treatment.

The core of IOP is group therapy, supported by individual counseling, relapse-prevention work, and — when appropriate — medication-assisted treatment. It's a common landing spot for people who don't need 24-hour care but need more than a weekly therapy appointment. Our broader outpatient rehab guide covers how IOP fits into the full range of options.

IOP vs PHP: the key differences

Both are outpatient, both let you live at home, and both can include medication and therapy. Here's how they differ:

• Hours per week. PHP runs roughly 25 or more hours a week; IOP runs about 9 to 12.
• Days per week. PHP is most days of the week; IOP is typically three to five.
• Medical oversight. PHP includes more frequent medical and psychiatric monitoring, which makes it a better fit when symptoms are less stable.
• Daily life. IOP is built to fit around a job or school; PHP largely takes over your daytime.
• Where they sit on the ladder. PHP is a step below residential care; IOP is a step below PHP.

Which level is right?

This is a clinical decision, made through an assessment, not a menu choice. In general, PHP fits people who need significant daily structure and monitoring but can safely sleep at home — for example, just after detox or inpatient care, or when a co-occurring mental health condition needs close attention. IOP fits people who are more stable, have reliable support at home, and need to keep up with work or family while still getting real, structured treatment.

Many people move through both. A common path is detox, then PHP, then a step down to IOP, then standard outpatient counseling — each stage loosening the structure as the person grows steadier. If a co-occurring condition is part of the picture, look for a program offering dual diagnosis treatment at whichever level you enter. And if you're weighing outpatient against a live-in program altogether, see our answer on inpatient vs outpatient rehab.

What does a week in each actually look like?

Numbers on a page don't always convey the difference, so picture the two side by side. In a PHP, treatment is essentially a daytime job: someone might arrive mid-morning, spend the day in a mix of group sessions, individual therapy, skills classes, and a check-in with a nurse or prescriber, then head home for dinner. It fills most of the day, which is why it suits people who need a lot of structure but no longer need overnight supervision. The trade-off is that it leaves little room for full-time work or school while it lasts.

An IOP week looks lighter and more flexible. Someone might attend three evening group sessions after work, plus an individual counseling appointment, and otherwise carry on with their normal responsibilities. That flexibility is the whole appeal — but it also means more of recovery happens out in everyday life, with its ordinary stresses and triggers, which is why IOP works best once a person is reasonably stable and has support at home.

Does Ohio Medicaid cover IOP and PHP?

Yes. Ohio Medicaid covers both intensive outpatient and partial hospitalization programs as part of its substance use disorder benefit, at participating providers. Private insurance plans are also required to cover these levels of care, though prior authorization and network rules can apply. When you call a program, confirm it's OhioMHAS-licensed, ask whether it accepts your specific plan or Medicaid managed-care plan, and ask what your out-of-pocket cost would be. Our guide to paying for rehab explains what to ask your insurer.

If you're not sure which level fits, that's normal — an intake assessment exists precisely to answer that question. The SAMHSA National Helpline can also point you toward IOP and PHP providers across Ohio at no cost.