By Josh Benton, CEO — Waterview Behavioral Health
Reviewed by Sarah Benton, LMHC, LPC, LCPC, AADC — Chief Clinical Officer
You’ve been told you need an intensive outpatient program. Or maybe you’re the one doing the research — scrolling late at night, trying to figure out what this means for someone you love. Either way, the alphabet soup of mental health treatment levels can feel impenetrable. IOP, PHP, OP, residential. It all blurs together when you’re already overwhelmed.
So let’s cut through it.
An intensive outpatient program is a structured level of mental health or substance use treatment that provides several hours of therapy multiple days per week — while still allowing you to sleep in your own bed, go to work, and maintain the routines that anchor your daily life. It sits between weekly outpatient therapy and full-day programs on the treatment continuum. And for a surprising number of people, it’s exactly the right level of care.
Where IOP Fits in the Continuum of Care
The American Society of Addiction Medicine organizes behavioral health treatment into a series of levels. At Level 1, there’s traditional outpatient therapy — the weekly fifty-minute session most people picture. At Level 2.1, you find IOP: nine or more hours of structured treatment per week, typically broken into three-hour sessions across three days. Level 2.5 is partial hospitalization (sometimes called a day program), which involves twenty or more hours across five or more days. Beyond that, Levels 3 and 4 involve residential care and inpatient hospitalization.
The distinction matters clinically. IOP exists for individuals who need more support than a single weekly session can provide — but who don’t require the round-the-clock supervision of a hospital or residential setting. That clinical middle ground is wider than most people assume.
According to the 2022 National Survey on Drug Use and Health, an estimated 59.3 million U.S. adults lived with a mental illness — 23.1% of the adult population. Yet only half received any form of treatment (SAMHSA, 2023). Part of the problem is access. Many people simply can’t leave their lives to enter residential care. IOP was designed to meet them where they are.
What Actually Happens in IOP
This isn’t a watered-down version of inpatient treatment. It’s a distinct clinical model.
At its core, IOP is built around group therapy — clinician-led sessions using evidence-based modalities like cognitive behavioral therapy, DBT, and EMDR. These aren’t casual conversations. They’re structured therapeutic work in which participants practice emotional regulation, challenge distorted thought patterns (the cognitive distortions that quietly run the show — things like catastrophizing or all-or-nothing thinking), and discover that other people in the room understand exactly what they’ve been going through.
That peer connection is powerful. Clinicians call it “universality,” and it’s one of the strongest therapeutic mechanisms group therapy offers.
But group work isn’t the whole picture. Most IOPs also include individual therapy, psychiatric assessment, medication management, and family sessions. At Waterview Behavioral Health, our Medical Director — Dr. Straun, board-certified in both General Psychiatry and Addiction Psychiatry — oversees medication decisions within the IOP framework. That dual specialization is uncommon in outpatient settings, and it matters significantly for individuals navigating co-occurring mental health and substance use disorders.
Family therapy is another component people don’t always expect. Yet mental health conditions don’t happen in a vacuum. They ripple into marriages, parenting, and friendships. Bringing family members into the process isn’t optional — it’s often the thing that makes recovery sustainable.
Does IOP Work? What the Research Shows
The evidence base for IOP is strong — and growing.
A landmark review by McCarty and colleagues, published in Psychiatric Services, found that intensive outpatient programs produced clinical outcomes comparable to residential treatment for individuals with substance use disorders, including sustained abstinence and improved functioning at follow-up. The authors argued that IOP should be considered a first-line option, not a fallback (McCarty et al., 2014).
More recently, a 2025 study in Actas Españolas de Psiquiatría examined an integrated IOP for co-occurring substance use and mental health disorders. Participants reported significant symptom improvement and high treatment satisfaction — though the authors noted that retention strategies remain a clinical priority (Bador et al., 2025). And research published in Military Medicine demonstrated that pre-enrollment groups within intensive outpatient settings reduced treatment delays for active-duty service members dealing with PTSD and depression (Bloom & Hoyt, 2025).
SAMHSA’s Treatment Improvement Protocol 47 — the federal government’s authoritative guide to IOP programming — states explicitly that intensive outpatient programs are “an effective alternative to residential care for many individuals.” That language doesn’t appear by accident. It reflects decades of accumulated evidence.
So yes. IOP works. But not all IOPs are the same.
What Separates a Good IOP from a Mediocre One
If you’re evaluating programs, here’s what to look for. Accreditation by The Joint Commission or CARF International — that means the program has been independently measured against national standards. Evidence-based modalities, not generic “talk therapy.” A board-certified psychiatrist actively involved in treatment decisions. Licensed clinicians running every group and individual session. And a real aftercare plan, because the transition out of IOP is just as important as the transition in.
At Waterview’s IOP in Wallingford, CT, the standard structure is three days per week of three-hour group therapy sessions, plus individual therapy, family therapy, and medication management. Treatment plans are reassessed continuously. Discharge planning begins well before the final session. And our clinical team communicates directly with referring providers — therapists, psychiatrists, primary care physicians — because continuity of care isn’t a buzzword. It’s a clinical necessity.
Recovery doesn’t follow a straight line. Every person’s path through treatment looks different — different triggers, different timelines, different definitions of what “getting better” actually means. But the research is consistent. Structured, evidence-based intensive outpatient care produces real, measurable change for individuals living with depression, anxiety, PTSD, and co-occurring disorders.
And there’s something to be said for doing that healing work while still living your actual life. Not in a facility somewhere far away. In your own community. Alongside the people and routines that will be there long after treatment ends.
That’s the promise of a well-run IOP. It doesn’t remove you from your life. It equips you to live it.
Josh Benton is the CEO of Waterview Behavioral Health in Wallingford, CT. Waterview offers a Joint Commission–accredited Intensive Outpatient Program with dedicated tracks for mental health, co-occurring disorders, and Mission Reset for first responders and veterans. To learn more or make a referral, call (860) 421-6829.