Medically reviewed by Peter Scheid, MD
Medical Director, SILC Health
Clinically reviewed by Alexandra Truman, LMFT
Clinical Director, Substance Use Services — SILC Health
Last reviewed: June 16, 2026
Once someone decides they need treatment for substance use or mental health, the next question is almost always: what kind? The behavioral healthcare system uses a tiered framework called the continuum of care, with five main levels from most intensive (inpatient hospitalization) to lightest (general outpatient). Knowing the differences — and knowing which one fits your situation — is the first step in actually getting useful help.
This guide walks through inpatient, residential, partial hospitalization (PHP), intensive outpatient (IOP), and standard outpatient. For each: what it actually means, who it's for, how long it lasts, what a day looks like, and how insurance typically covers it. The American Society of Addiction Medicine (ASAM) criteria are the standard framework used for placement decisions; this guide reflects how they apply in practice.
The continuum at a glance
- Inpatient (hospital): 24/7 medical care in a hospital setting. For acute medical or psychiatric crises.
- Residential: 24/7 treatment in a non-hospital facility. Live on-site for weeks. Most addiction treatment.
- Partial hospitalization (PHP): 5–6 days/week, ~6 hours/day. You go home at night.
- Intensive outpatient (IOP): 3–5 days/week, 3 hours/day. Sustainable alongside work or school.
- Outpatient: 1–3 hours/week. Therapy and medication management.
Inpatient: acute medical or psychiatric crisis
Inpatient care happens in a hospital, with 24/7 medical and psychiatric oversight. It's the most restrictive level — and the most expensive, because hospital infrastructure is involved. For substance use, inpatient is typically used for medical detox from drugs with dangerous withdrawal (alcohol, benzodiazepines, severe opioid use in someone with serious comorbidities). For mental health, it's used for acute psychiatric emergencies — active suicidality, severe psychosis, acute mania.
Stays are usually short: 3–10 days, sometimes longer for severe psychiatric cases. The clinical goal is medical or psychiatric stabilization — not the deeper recovery work. Once stable, the standard is to step down into residential or PHP for ongoing treatment.
Who it's for
- Medical detox from alcohol or benzodiazepines when home detox isn't safe
- Acute psychiatric crisis (suicidal ideation with plan, severe psychosis, severe mania)
- Co-occurring serious medical issues that complicate substance use treatment
Residential: the substance use treatment standard
Residential treatment is what most people picture when they think of rehab. You live at a treatment facility — not a hospital — for weeks. The setting is structured but not clinical: bedrooms, common areas, group rooms, outdoor space. 24/7 staff coverage but typically not 24/7 medical staff; medical needs are handled by visiting physicians and on-call coverage.
A typical residential day includes 4–6 hours of clinical programming: group therapy, individual therapy, psychoeducation, sometimes medication management. The rest of the day is structured around meals, recreation, peer interaction, and rest. Family programming usually starts in the second week. Length of stay is typically 30 days as a baseline, often extending to 60–90 days based on clinical progress.
Residential is the most common level for substance use treatment because it provides the structure, peer community, and clinical density that early recovery typically needs. The separation from the patterns and environments that drove use is part of what makes it work.
Who it's for
- Substance use disorder where home environment doesn't support recovery
- Multiple failed outpatient treatment attempts
- Significant co-occurring mental health needs alongside SUD
- First-time treatment for moderate-to-severe addiction
Partial hospitalization (PHP): structured day treatment
PHP is sometimes called "day treatment" because it functions like a job. You attend programming 5–6 days per week, typically 6 hours per day. You go home (or to sober living, or to family) at night. It's roughly half the clinical intensity of residential while providing substantially more structure than IOP.
PHP works well for people who need significant clinical structure but can safely go home at night — supportive family, established sober living, or a recovery community that's part of their daily life. It's also the standard step-down from residential treatment, providing continued structure while you re-engage with daily life.
Programming during PHP days mirrors residential: group therapy, individual therapy, psychoeducation, sometimes recreation or family sessions. Medication management runs alongside. Length is typically 2–4 weeks as a step-down from residential, sometimes longer as a primary treatment option.
Who it's for
- Step-down from residential treatment
- Substance use or mental health that needs significant clinical structure but home environment is workable
- Severe mental health conditions (PHP is common for severe depression, anxiety, eating disorders)
- People who can't take 30+ days off for residential but need more than IOP provides
Intensive outpatient (IOP): sustainable alongside life
IOP is the workhorse of long-arc treatment. 3–5 days per week, typically 3 hours per session, usually scheduled around work or school. Most IOP programs offer morning and evening tracks to accommodate different schedules. The combination of clinical intensity and life integration is what makes IOP sustainable for the longer recovery timeline.
IOP can be primary treatment for milder substance use or mental health, but it's most commonly used as a step-down from residential or PHP. After the initial intensive phase, IOP provides the continued structure and clinical contact that supports the first 3–12 months of recovery — the highest-relapse window.
Programming includes group therapy (the bulk of the hours), individual therapy (typically weekly), and medication management. IOP groups often focus on specific themes — early recovery skills, relapse prevention, trauma processing, family dynamics — and rotate through curriculum across weeks. Length is typically 6–12 weeks as a primary or step-down treatment.
Who it's for
- Step-down from residential or PHP
- Primary treatment for mild-to-moderate substance use or mental health
- Continuing care during the first 6–12 months of recovery
- People who need ongoing clinical support but can manage work, school, or family obligations alongside
Outpatient: ongoing care
Standard outpatient is what most people experience as "therapy" or "counseling" — typically 1 hour per week with a therapist, or medication management visits with a psychiatrist or psychiatric nurse practitioner. It's the lightest level of care and the most sustainable long-term. For many people, outpatient continues for years or indefinitely as a tool for sustained recovery and mental health management.
Outpatient is appropriate as a step-down from IOP, as continuing care for stable mental health conditions, and as primary care for mild conditions that don't require more structured treatment. The relationship with a therapist or prescriber is the central clinical mechanism.
How clinicians decide which level is right
The ASAM Criteria — the standard framework in addiction medicine — uses six dimensions to determine appropriate level of care:
- Acute intoxication or withdrawal potential — do you need medical detox?
- Biomedical conditions — what medical issues need attention?
- Emotional, behavioral, or cognitive conditions — what mental health is involved?
- Readiness to change — how engaged are you in the work?
- Relapse, continued use, or continued problem potential — how high is the risk of relapse?
- Recovery environment — does your living situation support recovery?
For mental health, similar dimensional thinking applies: severity of symptoms, level of functioning, safety risk, support system, treatment history. The clinical assessment that happens at admission is essentially answering these questions and matching you to the right level — not selling you the most expensive option.
Insurance typically covers all levels — with conditions
Under federal parity law, insurance must cover behavioral health at the same level as medical/surgical care. In practice, this means most insurance covers detox, residential, PHP, IOP, and outpatient — but each level requires medical necessity, often requires prior authorization, and may be subject to length-of-stay reviews. Out-of-network coverage varies by plan; PPO plans typically include some out-of-network behavioral health benefits, HMO plans typically don't.
Coverage specifics depend on your specific plan and the facility. SILC Health's admissions team handles benefits verification for any plan — see our insurance page for the carriers we work with, or verify your benefits directly.
What to do next
If you're trying to figure out which level of care is right for you or someone you love, the most useful next step is a clinical assessment — not a guess. SILC Health's admissions team does the assessment as part of every intake conversation. We work through the ASAM dimensions, talk through your specific situation, and recommend the level of care that fits. Often the recommendation is residential plus a step-down plan into PHP and IOP; sometimes it's IOP as primary treatment; occasionally it's outpatient. The assessment is the work.