IOP vs PHP: what’s the difference?
Plain answers, with Colorado numbers from Step One’s listings (updated November 2026).
Short answer: PHP (partial hospitalization) is treatment for most of the day, about five days a week. IOP (intensive outpatient) is a few hours at a time, several days a week. In both, you sleep at home or in sober living. PHP is for people who need more support; IOP lets most people keep working.
| IOP | PHP | |
|---|---|---|
| Time each week | Usually 9–20 hours (often 3 hours, 3–5 days a week) | Usually 20+ hours (about 5–6 hours a day, 5 days a week) |
| Where you sleep | At home or in sober living | At home or in sober living |
| Can you keep working? | Usually yes; many run evening groups | Usually not full-time during treatment |
| Who it’s for | Stable enough to live at home, needs more than weekly counseling | Needs a lot of support but not 24-hour care; often a step down from residential |
| Typical length | Often 6–12 weeks | Often 2–6 weeks, then IOP |
| Colorado programs on Step One | 65 | 31 |
| List Medicaid | 83% | 68% |
| List any insurance | 92% | 94% |
| Evening option | 11% | 3% |
| Online / virtual option | 32% | 19% |
| Medication (MAT) friendly | 71% | 90% |
Common questions
What is the difference between IOP and PHP?
Both are outpatient: you sleep at home or in sober living. PHP (partial hospitalization) is more intensive, usually most of the day, five days a week. IOP (intensive outpatient) is a few hours at a time, several days a week, so many people keep working or studying.
Which one do I need?
It depends on how much support you need day to day. A clinical assessment decides the right level of care (Colorado uses the ASAM criteria). Many people go from residential to PHP to IOP as they get stronger. Our 4-question guide can help you think it through.
Does Colorado Medicaid cover IOP and PHP?
Health First Colorado (Medicaid) covers outpatient substance use treatment when it’s medically needed. On Step One, 83% of IOP programs and 68% of PHP programs list Medicaid.
Can I do IOP online?
Some programs offer IOP by video. 32% of Colorado IOP programs on Step One list an online or virtual option.
Percentages are calculated from Step One’s IOP and PHP listings each time the site updates. Typical hours and lengths are general guides; each program sets its own. Editorial policy.
