IOP vs. PHP vs. Outpatient: Which Level of Care Do You Need?

When you start looking into substance use treatment, you'll quickly run into a wall of acronyms: OP, IOP, PHP, ASAM, MAT. The most important ones describe levels of care — how intensive your treatment is and how many hours per week you'll spend in it. Understanding the difference between IOP, PHP, and standard outpatient helps you know what to expect and what to ask for.

This guide explains each outpatient level of care, who each one is for, and how a clinical team decides which is right for you.

What Are the ASAM Levels of Care?

The American Society of Addiction Medicine (ASAM) created a widely used framework that organizes addiction treatment into levels, from the least to the most intensive. Outpatient care — treatment that lets you live at home rather than in a residential facility — covers three main levels:

• Level 1: Outpatient (OP) — fewer than 9 hours per week
• Level 2.1: Intensive Outpatient (IOP) — 9 to 20 hours per week
• Level 2.5: Partial Hospitalization (PHP) — 20 or more hours per week

All three are covered by Maryland Medicaid. Here's how they compare.

Level 1: Standard Outpatient (OP)

Hours: Fewer than 9 per week, often 1–3 sessions.

Standard outpatient treatment is the most flexible level of care. It's built for people who have a stable living situation, a support system, and responsibilities like work or school that they can maintain alongside treatment. Sessions include individual counseling, group therapy, and skills-based education.

OP is a great fit for people early in their recovery journey with lower-severity needs, or for those stepping down from a more intensive program who want to keep their momentum going.

Level 2.1: Intensive Outpatient (IOP)

Hours: 9 to 20 per week, typically 3–5 days a week for about 3 hours per session.

Intensive Outpatient (IOP) is a step up in structure. It's designed for people who need more support than standard outpatient can provide but don't require round-the-clock care. The bigger time commitment means more group therapy, more individual counseling, and a stronger focus on identifying triggers and building coping skills.

A common question is whether you can keep working during IOP. For most people, yes — IOP schedules (including some evening options) are built specifically so you can continue to work, attend school, and care for your family while in treatment.

Level 2.5: Partial Hospitalization (PHP)

Hours: 20 or more per week, often resembling a full-day program several days a week.

Partial Hospitalization (PHP) is the most intensive level of outpatient care — sometimes called "day treatment." You receive structured clinical support for most of the day and then return home in the evening. PHP is ideal for people who need a high level of support, including those stepping down from inpatient or detox, but who have a safe place to stay overnight.

PHP bridges the gap between residential treatment and lower-intensity outpatient care, offering many of the clinical benefits of inpatient treatment without requiring you to live at the facility.

IOP vs. PHP: What's the Difference?

The core difference between IOP and PHP is intensity and time. PHP is the higher level of care — 20+ hours per week, often daily, structured like a full day of treatment. IOP is less time-intensive at 9–20 hours per week. People often start at PHP and step down to IOP, then to standard outpatient, as they stabilize and gain confidence in their recovery.

Outpatient vs. Inpatient: Where Do These Fit?

All three of these levels are outpatient — you live at home. Inpatient or residential treatment, by contrast, means living at a facility 24 hours a day. Outpatient care lets you keep your job, school, and family life while you get treatment, and it's appropriate for the majority of people who have a safe and stable home environment. Many people never need inpatient care at all, or use it briefly before stepping down to outpatient.

How Do I Know Which Level Is Right for Me?

You don't have to figure this out alone. During a clinical assessment, our team looks at several factors:

• The severity and history of your substance use
• Whether you have co-occurring mental health conditions
• The stability and safety of your living situation
• Your work, school, and family obligations
• Any previous treatment experience
• Your personal goals and preferences

Based on that, we recommend a starting level of care — and we adjust it as you progress. Treatment isn't a straight line, and moving between levels is normal and expected.

Start With an Assessment

The simplest way to find your level of care is to talk to us. Start your intake online, verify your Medicaid coverage, or call (410) 934-7976. If you're still deciding whether it's time to reach out at all, our post on the signs it may be time to seek help can help.