Partial Hospitalization Program (PHP)

Medically reviewed by Bradley Tourtlotte, MD · Written by the California Treatment Centers clinical team · Last reviewed June 2026

Partial hospitalization is the most intensive treatment you can receive while still sleeping in your own bed. It is a full clinical day — commonly five to six hours, five days a week — followed by evenings and nights at home or in sober living. In the ASAM Criteria that most clinicians and insurers use, this is Level 2.5, sitting directly between residential treatment and intensive outpatient.

It exists for a specific and very common situation: someone needs substantially more structure than a few weekly appointments can provide, but does not need — or cannot accept — twenty-four-hour supervision.

What a PHP Day Actually Looks Like

People are often surprised by how full the day is. A typical schedule runs mid-morning to late afternoon and includes group therapy as the core, individual sessions, psychiatric and medical review, and skills work — relapse prevention, emotion regulation, managing triggers. Where medication is part of treatment, dosing and monitoring happen within the program. Many programs include family sessions weekly, which is one of the strongest predictors of a good outcome and one of the most frequently skipped components.

The evening is the point. Going home each night means practising recovery against real conditions — the same kitchen, the same commute, the same relationships — while still having a full clinical team reviewing how it went the next morning. In residential treatment, problems surface after discharge. In PHP, they surface on a Tuesday and get worked on Wednesday.

Who PHP Suits

• Stepping down from residential or detox. The most common route. It converts the abrupt drop-off after residential treatment into a graded transition, which is where most relapses happen.
• Stepping up from outpatient. When weekly therapy is visibly not holding — missed sessions, escalating use, a near-miss — PHP is often the right intensification before considering residential.
• Direct admission. Someone whose use is serious but who is medically stable, housed, and has support at home can start here without a residential stay first.
• People who cannot go residential. Single parents, carers, people who would lose a job or housing during a thirty-day absence. PHP is frequently the highest level of care these people can realistically accept, and it is a genuine option rather than a consolation.

It is not appropriate for active withdrawal requiring medical management — alcohol and benzodiazepine withdrawal can be dangerous and need supervised detox first — nor for anyone who is not safe alone overnight, or whose home environment has active substance use in it.

PHP, IOP and Residential Compared

Most people do not choose one of these. They move through them, and the step-downs are where the durable gains are made.

Housing Alongside PHP

A frequent and sensible question: what if home is not a stable place to spend the evening? Pairing PHP with structured sober living is a well-established arrangement — clinical treatment by day, an accountable substance-free residence by night. It approaches the containment of residential treatment at meaningfully lower cost, and it is often the right answer where the home environment is the main risk. Worth knowing that the housing is usually billed separately from the clinical program.

PHP Across California

Because PHP means attending most days, commute is a clinical variable, not a convenience. A program forty-five minutes away in traffic is a program people stop attending in week two. When we help arrange PHP we treat travel time as part of whether the plan will actually work.

That matters differently by region. In Los Angeles County the options are dense but the geography is punishing — a Westside program is not realistically daily-accessible from the San Gabriel Valley. In the Bay Area, programs concentrate in San Francisco and the larger North Bay and Peninsula hubs, so people in Marin County — San Anselmo, Mill Valley, Corte Madera, San Rafael, Larkspur — are usually weighing a daily bridge commute against a program further out. It is worth being realistic about that at the planning stage rather than three weeks in. In the Central Valley and the north state, daily-attendance programs thin out considerably, and residential care is often the more practical answer.

Insurance and Cost

PHP is a covered benefit under most commercial plans, and federal parity law bars stricter limits than comparable medical care. Expect prior authorisation to be required, typically granted for a set number of days with concurrent review — the program must periodically justify continued attendance. Because payers assess medical necessity against the ASAM Criteria, a thorough initial assessment documenting withdrawal risk, co-occurring conditions, relapse potential and the home environment is what supports authorisation at this level.

See Kaiser and Aetna coverage specifically, or how California coverage and appeals work if a request is denied. We will verify your benefits free before you commit.

Talk It Through

Call 213-321-6518 for a confidential conversation about whether PHP is the right level of care. We will be straight with you if something less intensive would do, or if the situation actually calls for residential treatment first.

In a crisis, call or text 988. If someone may be overdosing, call 911.