If you or someone you know is in crisis right now: call or text 988 (Suicide & Crisis Lifeline). For a possible overdose or any medical emergency, call 911. For help finding treatment, the SAMHSA National Helpline is free and open 24/7 at 1-800-662-4357.
The short answer
Partial hospitalization (PHP) is the more intensive of the two: treatment for much of the day, typically around 20 or more hours a week, most days, and you go home at night. Intensive outpatient (IOP) is lighter: usually about nine or more hours a week over several days, which leaves more room for work, school and family. Both sit between standard outpatient care and residential rehab, and many people use them to step down gradually.
Where PHP and IOP fit
Think of treatment as a ladder:
Residential → PHP → IOP → Standard outpatient → Aftercare
PHP and IOP are the middle rungs. They give you serious structure without requiring you to live at a facility. (For the full picture, see [Inpatient vs Outpatient Rehab: Which Level of Care Is Right for You?].)
What is partial hospitalization (PHP)?
PHP is a structured day program. You attend treatment for several hours a day, often five days a week, then go home or to sober housing in the evening.
What it typically includes:
- Daily group and individual therapy
- Regular contact with doctors, nurses or psychiatric providers
- Medication management
- Education and relapse-prevention skills
- Treatment for co-occurring mental health conditions
A typical day: arrive in the morning, attend group sessions, take a lunch break, meet with a therapist or doctor in the afternoon, and head home by late afternoon.
May suit people who:
- Need daily structure and medical or psychiatric oversight but do not need 24-hour care
- Are stepping down from residential treatment
- Have a safe, stable place to stay at night
- Are at moderate to high risk of relapse
Keep in mind: PHP is hard to combine with a full-time job, and it requires reliable transportation.
What is intensive outpatient (IOP)?
IOP is a step lighter. Sessions usually run a few hours at a time, on about three to five days a week. Many programs offer morning or evening schedules.
What it typically includes:
- Group therapy (the core of most IOPs)
- Individual counseling
- Education and skill-building, such as coping with cravings
- Medication management, in many programs
- Family sessions and support
May suit people who:
- Have a mild to moderate disorder, or are stabilizing after higher levels of care
- Have a stable home and support
- Need to keep working, studying or caring for family
- Have tried standard outpatient care and need more structure
Keep in mind: IOP offers less supervision than PHP, so it relies more on your own motivation and a supportive home.
PHP vs IOP side by side
| PHP | IOP | |
|---|---|---|
| Time commitment | Typically around 20+ hours a week, most days | Typically about 9+ hours a week, several days |
| Typical length | Several weeks, sometimes longer | Often a couple of months or more |
| Medical access | Frequent, often hospital-linked | Less frequent |
| Where you sleep | Home or sober housing | Home or sober housing |
| Work or school | Difficult | Often possible, especially with evening programs |
| Supervision | Higher | Moderate |
| Cost | Higher than IOP, lower than residential | Lower than PHP |
| Best for | Needing daily structure without living on site | Needing support while keeping routines |
Programs vary, so ask each one for its actual schedule.
PHP vs residential rehab
PHP offers a similar schedule of treatment to residential care, but you sleep at home, which makes it cheaper and more flexible. It is a better fit when your home is safe and stable. If your home environment is a trigger, or withdrawal risk is high, residential care may be safer.
How to choose: questions to ask
- Is my home stable and free of substances? If not, ask about sober housing or residential care.
- Do I need daily medical or psychiatric support? That points toward PHP.
- Can I get to treatment reliably? Transportation matters, especially for PHP.
- Do I have work or family duties I cannot step away from? IOP may fit better.
- Am I stepping down or starting out? Starting treatment may call for a more intensive level.
- Do I have co-occurring mental health symptoms? PHP may offer more clinical support.
A clinician should make the final recommendation. (See [How to Know If You Need Rehab: A Self-Assessment Checklist].)
Moving between levels
Treatment is rarely a straight line. A common path is residential, then PHP, then IOP, then standard outpatient. If you struggle at a lower level, you can step up. If you do well, you can step down. A good program plans for this. (See [What Is Aftercare? How to Build a Relapse-Prevention Plan] and [How Long Does Rehab Last? 30, 60 and 90-Day Programs Explained].)
Medication, mental health and telehealth
- Medication for alcohol, opioid or tobacco use disorders can be part of PHP or IOP. (See [Medication-Assisted Treatment (MAT): How It Works and Who It’s For].)
- Mental health conditions can be treated alongside. (See [Dual Diagnosis Treatment: When Addiction and Mental Health Overlap].)
- Some IOPs run online. (See [Is Telehealth Addiction Treatment Effective? Pros, Cons and Costs].)
Cost and insurance
PHP generally costs more than IOP because it involves more hours and more medical staff. Many insurance plans cover both when medically necessary, and may require approval before you start and review your progress. (See [Does Insurance Cover Rehab? How to Check Your Benefits Step by Step] and [In-Network vs Out-of-Network Rehab: What It Means for Your Bill].)
Questions to ask a program
- What is the weekly schedule, and how many hours of treatment are there?
- How many people are in each group, and who leads them?
- Are doctors or psychiatric providers available, and how often?
- What therapies do you use?
- Do you offer medication, and how do you treat mental health conditions?
- What happens if I need a higher or lower level of care?
(See [15 Questions to Ask a Rehab Center Before You Sign Up].)
If you are a family member
You can help by offering rides, helping with childcare and encouraging attendance without taking over. Staying involved in family sessions, when offered, often helps.
Frequently asked questions
What is the difference between PHP and IOP?
PHP is more intensive, typically around 20 or more hours a week, most days, with greater medical access. IOP is typically about nine or more hours a week over several days and is more flexible.
Is PHP the same as inpatient?
No. In PHP you go home at night. Inpatient or residential care means you stay at the facility.
Can I work during IOP?
Often yes, especially with evening or morning schedules. PHP is harder to combine with a full-time job.
How long do PHP and IOP last?
PHP often lasts several weeks, and IOP often lasts a couple of months or longer. Your care team adjusts the plan to your progress.
Is IOP effective?
Research supports intensive outpatient care for many people, especially with a stable home and good support. The right level depends on your needs.
Does insurance cover PHP and IOP?
Many plans do when medically necessary, but approval rules differ. Check with your insurer and the program.
Sources
- American Society of Addiction Medicine. The ASAM Criteria. asam.org
- National Institute on Drug Abuse (NIDA). Principles of Drug Addiction Treatment: A Research-Based Guide. nida.nih.gov
- SAMHSA. National Helpline and FindTreatment.gov. samhsa.gov
This article is for general information only and is not medical advice. Program schedules and coverage vary, so confirm details with your provider and insurer.