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IOP vs PHP vs weekly therapy: which level of care fits?

Weekly therapy, intensive outpatient (IOP) and partial hospitalization (PHP) are steps on the same ladder. Here's what each one is, how many hours it takes, who it fits, what insurance asks for, and how people move between them, for mental health and substance use care.

Updated October 25, 2026. General information, not medical, legal or insurance advice.

If you need help now: call 911 in an emergency. In a mental health or substance use crisis, call or text 988, any time. SAMHSA's National Helpline, 1-800-662-4357, is free, confidential and open 24/7 for treatment referrals.

The short version

In weekly therapy, IOP and PHP you sleep at home. What changes is how many hours of treatment you get each week.

Level	Time each week	Often a fit when
Weekly outpatient therapy	Usually one session a week or every other week; under 9 hours a week	You're handling work, school and home most days and want help with symptoms, stress, relationships or substance use.
Intensive outpatient (IOP)	At least 9 hours, for example 3 hours a day, 3 days a week	Weekly therapy isn't enough, but you're safe at home and can keep some of your routine.
Partial hospitalization (PHP)	At least 20 hours, for example 4 or more hours a day, 5 days a week	You need treatment most of the day, but not a hospital bed.
Residential or hospital	Around the clock	You aren't safe at home, you need 24-hour medical care (for some kinds of withdrawal, for example), or lower levels haven't worked.

Weekly outpatient therapy

This is what most people mean by "therapy": regular sessions with a counselor, social worker, psychologist or marriage and family therapist, alone or with family, in an office or by video. Medication visits with a psychiatrist or psychiatric nurse practitioner, and therapy groups, are outpatient care too. Most people start here.

For substance use, outpatient care can also include medication for opioid or alcohol use disorder, or care for withdrawal that's safe to manage outside a hospital. Our guide to choosing a therapist in Texas explains the credentials and what to ask on a first call.

Intensive outpatient (IOP)

An IOP is a structured program you attend several days a week, a few hours at a time: mostly group therapy, plus individual sessions, skills practice and education. Some meet in the evening so you can keep working.

Hours: for adults, at least 9 a week. ASAM's intensive outpatient level is 9 to 19 hours, and Medicare covers IOP when your care plan calls for at least 9. SAMHSA cites a minimum of 6 hours a week for teens.
How long: it depends on your progress and on what insurance approves, often several weeks to a few months. It should end with a plan for your next step.

SAMHSA describes IOP as a first treatment, a step down after a hospital, residential or withdrawal program, or a step up from weekly therapy. It often fits when weekly therapy isn't enough, but you're safe at home and not at risk of dangerous withdrawal.

Partial hospitalization (PHP)

PHP is the most intensive care you can get while sleeping at home: most of the day, often five days a week, with a psychiatrist or nurse practitioner on the team, medication management, and group and individual therapy.

Hours: at least 20 a week. That's the line for ASAM's Level 2.5 and for Medicare's PHP benefit. Medicare covers PHP only when a doctor or other qualified clinician certifies that you'd otherwise need inpatient care.
The name is confusing. Many PHPs aren't in a hospital. The current edition of the ASAM Criteria calls the substance use version "High-Intensity Outpatient" and calls the PHP label a misnomer. Insurers and Medicare still say PHP.

It often fits when you need daily structure and quick changes to treatment but you're safe at night, or as a step down from a hospital stay.

It isn't for someone in immediate danger: call 911 or go to an emergency room. Even Texas Medicaid's rules bar health plans from offering outpatient care in place of a hospital for members at immediate risk of harming themselves or others.

How the ASAM levels map to these

The ASAM Criteria, from the American Society of Addiction Medicine, are standards for matching substance use treatment to a person's needs, and many health plans use them to decide what to approve. The fourth edition, released in 2023, renamed some levels. The adult levels:

Level	Fourth edition name	In plain words
1.0	Long-Term Remission Monitoring	Check-ins once you're in stable recovery
1.5	Outpatient Therapy	Weekly outpatient care, under 9 hours a week
1.7	Medically Managed Outpatient	Outpatient care plus addiction medication or withdrawal care
2.1	Intensive Outpatient	IOP, 9 to 19 hours a week
2.5	High-Intensity Outpatient	What plans usually call PHP, 20 or more hours a week
2.7	Medically Managed Intensive Outpatient	Intensive outpatient with medical management, including withdrawal care
3.1, 3.5, 3.7	Residential levels	You live at the program
4	Medically Managed Inpatient	Hospital care

Withdrawal care is now built into levels 1.7, 2.7, 3.5 and 3.7, and every level is expected to treat co-occurring conditions (a mental health condition along with substance use).
The third edition called Level 2.5 "Partial Hospitalization", hence the mixed-up names. Teens and young adults have their own ASAM volume.

A clinician places you after an assessment of six areas, including withdrawal risk, physical and mental health, your home and support, and what you want from treatment. Ask them to explain the result.

Mental health programs

Mental health IOPs and PHPs treat conditions like depression, anxiety, bipolar disorder and trauma. Instead of ASAM, many insurers use LOCUS (the Level of Care Utilization System) for adults and CALOCUS-CASII for children and teens, or their own written guidelines.

Medicare covers PHP and, since January 1, 2024, IOP for mental health conditions, including substance use disorders. It pays for these at hospital outpatient departments and community mental health centers, and for IOP also at federally qualified health centers, rural health clinics and opioid treatment programs.
Texas Medicaid health plans can cover PHP and IOP as a substitute for a hospital stay. As of November 2025, HHSC had approved 14 health plans to offer each, so ask yours.

If you live with both a mental health condition and substance use, ask any program how it treats both.

What insurance usually needs

Many plans cover IOP and PHP, but intensive care usually comes with paperwork:

Prior authorization. The plan approves the level of care before you start. Approval isn't a promise to pay.
Medical necessity. The plan must agree the care is needed and meets accepted standards of medicine. The program sends your assessment, often scored against ASAM, LOCUS or the plan's own criteria.
Continued-stay reviews. Plans often approve a block of days, then review your progress before approving more.
Your share of the cost. Programs often bill by the day, so coinsurance can apply to each day. With Medicare, after the Part B deductible you pay 20% of the approved amount, plus coinsurance for each day in a hospital outpatient department or community mental health center.

Under federal parity law, a plan's prior authorization rules for this care can't be stricter than for comparable medical care, and you can ask for the criteria behind any denial. Our guide to using your insurance in Texas covers the call to your plan, carve-outs, appeals and Medicaid.

Stepping up and stepping down

Talk to your clinician about more support if your symptoms keep getting worse despite regular sessions, you're missing work or school, you're drinking or using more (or started again), or you've recently been to an emergency room. If you're thinking about suicide, don't wait for your next appointment: call or text 988.

Stepping down is a good sign, not a loss of support. A PHP usually steps down to IOP, and IOP to weekly therapy and, for substance use, recovery support. But SAMHSA notes that any change in treatment makes it more likely someone stops coming. Before you leave a level:

Book the next appointment, with a date and time.
Know who will refill your medications. Don't stop one without talking to the prescriber.
Have a written plan for what to do in a crisis.
Ask whether the next level needs its own authorization. It usually does.

Questions to ask a program

Are you licensed, and accredited by an outside reviewer such as The Joint Commission or CARF? In Texas, a substance use program needs an HHSC chemical dependency treatment facility license (faith-based programs offering only nonmedical care register instead). HHSC's online licensing search shows it.
Do you offer FDA-approved medication for opioid and alcohol use disorders?
Which therapies do you use, and does research support them?
What's the schedule, and is there an evening or video option?
Are you in network with my plan, and what will I owe per day?
How do you include family, and what happens after I finish?
How soon can I start? SAMHSA suggests looking elsewhere if a program can't see you within 48 hours.

To compare programs, search Texas providers by insurance or use SAMHSA's FindTreatment.gov. Cima Find Care listings show each program's state license and the date it was checked (how listings work), but check it yourself too. More plain-language guides are on our guides page.

Questions people ask

Is IOP or PHP better?

Neither is better. The right one is the least intensive level that's safe and still likely to work for you right now. A licensed clinician's assessment should point to it, and it can change as you get better.

Can I keep working during IOP?

Often, yes. IOP takes a few hours on some days of the week, and some programs meet in the evening. PHP takes most of the day, so many people take time off work or school.

What's the difference between PHP and residential treatment?

Where you sleep. In PHP you go home every night. In residential treatment you live at the program, with staff there around the clock.

Does insurance cover IOP and PHP?

Many plans do, usually with prior authorization and a medical necessity review, and Medicare covers both through certain hospitals and clinics. Call the number on your card and ask what you'll owe per day.

Can I do IOP by video?

Some programs offer it. Ask whether your plan covers it, and make sure the clinicians are licensed in Texas, the state you're in during sessions.