See how often substance use treatment facilities report both intensive outpatient and day treatment or partial hospitalization, with downloadable state counts.
In the 2024 SAMHSA public-use survey file, 2,259 of 2,407 facilities that reported day treatment or partial hospitalization also reported intensive outpatient treatment (93.9%).
The calculation covers the 50 states and DC. SAMHSA asks about day treatment or partial hospitalization as a single response option. This article uses that combined label throughout and gives the counts behind the percentages. Download the state and national table (CSV).
How often do treatment facilities offer IOP and PHP?
Of 13,508 facility records with yes or no answers to both outpatient substance use treatment items, 2,259 reported both (16.7%). The percentage changes depending on which question you ask. Among the 6,931 facilities that reported intensive outpatient treatment (IOP), 2,259 also reported day treatment or partial hospitalization (32.6%). Among the 2,407 that reported the combined day treatment or partial hospitalization option, 2,259 also reported IOP (93.9%).
| 2024 answers in the 50 states and DC | Facility records | Share of records with two valid answers |
|---|---|---|
| Both IOP and day treatment or partial hospitalization | 2,259 | 16.7% |
| IOP yes, day treatment or partial hospitalization no | 4,672 | 34.6% |
| IOP no, day treatment or partial hospitalization yes | 148 | 1.1% |
| No to both items | 6,429 | 47.6% |
| Total | 13,508 | 100.0% |
The four rows are mutually exclusive. A facility counted in the first row contributes to the IOP total and to the day treatment or partial hospitalization total. To find the number that reported at least one of the two services, add the first three rows. The fourth row can include facilities offering other outpatient services.
Compare the service mix by state
Look up any state or DC below. Each percentage divides the number of records reporting both services by the number of records in that geography with yes or no answers to both survey items. The downloadable CSV also shows the four answer combinations.
| State or district | Records with two valid answers | Both services reported | Share reporting both |
|---|---|---|---|
| Alabama | 115 | 6 | 5.2% |
| Alaska | 76 | 11 | 14.5% |
| Arizona | 443 | 98 | 22.1% |
| Arkansas | 141 | 31 | 22.0% |
| California | 974 | 291 | 29.9% |
| Colorado | 293 | 27 | 9.2% |
| Connecticut | 162 | 28 | 17.3% |
| Delaware | 54 | 4 | 7.4% |
| District of Columbia | 24 | 5 | 20.8% |
| Florida | 594 | 139 | 23.4% |
| Georgia | 301 | 68 | 22.6% |
| Hawaii | 98 | 16 | 16.3% |
| Idaho | 106 | 23 | 21.7% |
| Illinois | 604 | 71 | 11.8% |
| Indiana | 436 | 42 | 9.6% |
| Iowa | 180 | 22 | 12.2% |
| Kansas | 159 | 6 | 3.8% |
| Kentucky | 530 | 93 | 17.5% |
| Louisiana | 171 | 40 | 23.4% |
| Maine | 139 | 5 | 3.6% |
| Maryland | 469 | 104 | 22.2% |
| Massachusetts | 322 | 65 | 20.2% |
| Michigan | 408 | 32 | 7.8% |
| Minnesota | 312 | 46 | 14.7% |
| Mississippi | 102 | 12 | 11.8% |
| Missouri | 272 | 56 | 20.6% |
| Montana | 95 | 5 | 5.3% |
| Nebraska | 116 | 3 | 2.6% |
| Nevada | 118 | 23 | 19.5% |
| New Hampshire | 87 | 11 | 12.6% |
| New Jersey | 357 | 114 | 31.9% |
| New Mexico | 137 | 6 | 4.4% |
| New York | 632 | 34 | 5.4% |
| North Carolina | 463 | 87 | 18.8% |
| North Dakota | 58 | 25 | 43.1% |
| Ohio | 689 | 175 | 25.4% |
| Oklahoma | 162 | 5 | 3.1% |
| Oregon | 213 | 23 | 10.8% |
| Pennsylvania | 473 | 80 | 16.9% |
| Rhode Island | 48 | 5 | 10.4% |
| South Carolina | 91 | 10 | 11.0% |
| South Dakota | 43 | 3 | 7.0% |
| Tennessee | 356 | 42 | 11.8% |
| Texas | 502 | 86 | 17.1% |
| Utah | 229 | 91 | 39.7% |
| Vermont | 54 | 1 | 1.9% |
| Virginia | 351 | 37 | 10.5% |
| Washington | 337 | 25 | 7.4% |
| West Virginia | 121 | 1 | 0.8% |
| Wisconsin | 245 | 24 | 9.8% |
| Wyoming | 46 | 2 | 4.3% |
Use the raw counts when citing a state percentage. In California, the 291 records in the overlap can be compared with 300 reporting IOP without day treatment or partial hospitalization. In New York, 34 reported both and 155 reported IOP without the combined service. These shares describe the facilities included in this analysis. To answer questions about local access, a planning team would need separate evidence about location, capacity and who can be served.
For a separate question about how IOP facilities reported accepting payment, see the Medicaid and private insurance acceptance analysis. It joins the reported IOP offering to two facility-level payment answers.
Read the newer SAMHSA totals in context
Table SU4 in SAMHSA's 2025 Annual Detailed Tables reports 15,472 substance use treatment facilities in its annual-report population, including 6,540 reporting intensive outpatient treatment and 2,320 reporting day treatment or partial hospitalization. These are published counts for each service. The two service totals include facilities that may report both.
Use the 2025 table when the question is how many facilities reported each service under SAMHSA's annual-report definition. Use the 2024 cross-tabulation on this page when the question is how often both services appeared on the same facility record in that year. The annual report and this analysis use different inclusion rules and denominators. To compare overlap across years, repeat the calculation on facility-level files using matching definitions and geography.
Reproduce the calculation
Start with the Delimited archive and codebook on the 2024 N-SUMHSS data files page. The 2024 codebook identifies the two variables as CTYPE2 and CTYPEOP, both under question A6a. The reference date for the 2024 survey was March 29, 2024.
- Open the 2024 public-use CSV. Use one count per record and keep the 50 states and DC in
LOCATIONSTATE. - Keep records with a 0 or 1 for each of
CTYPE2andCTYPEOP. A 1 means yes and a 0 means no. Exclude missing values and logical skips. All records with both answers also report outpatient substance use care inCTYPE1. - Count the four combinations of the two answers. Sum the four counts to get the denominator for each state, or for the 50 states and DC together.
- Divide the overlap by the relevant denominator. Use all included records for the overall overlap, all IOP-positive records for the share of IOP facilities reporting both, or all day treatment or partial hospitalization-positive records for the reverse question.
The results are unweighted counts of facility records. Each included record contributes one count, regardless of size. The file describes responses to a voluntary facility survey at a particular time. The combined field gives one answer for both day treatment and partial hospitalization. To count patients, visits, seats or current capacity, use a source that measures those quantities.
Test the workflow if your program offers both
A team operating both services can bring one fictional patient record to an EHR demo. Ask the vendor to start the patient in partial hospitalization, then show what a scheduler, clinician and biller each see when the patient starts IOP. Use the same test with every vendor. Check whether the team can find the existing record, identify the correct appointment and group roster, and see who owns each open question.
| Role | Sample change | Evidence to ask for |
|---|---|---|
| Scheduling | The patient starts a new group schedule | The new group, start date, and disposition of upcoming appointments from the previous program |
| Clinical | The new care team reviews prior notes | A way to identify the earlier notes, their program, and the current treatment plan |
| Authorization | A staff member needs to confirm the new service | A visible question, assigned owner, and record of how it was resolved |
| Billing | Staff review the first encounter after the change | A trace from the encounter to its note, program, and billing review status |
See the PHP-to-IOP record handoff for a worked example. Use the IOP EHR buyer guide and the PHP EHR buyer guide to prepare separate tests for the two programs, then join them in one sample handoff.
Cite the figures with the year and denominator
Use the survey year, geography and two-variable filter with any figure. For example, “Ease Health analysis of the 2024 SAMHSA N-SUMHSS public-use file. Of 13,508 facility records with valid responses for both outpatient items in the 50 states and DC, 2,259 (16.7%) reported both intensive outpatient treatment and day treatment or partial hospitalization.” If citing the 93.9% figure, name the smaller denominator of 2,407 facilities reporting the combined day treatment or partial hospitalization option.
For an independent check, use the state and national CSV alongside the original archive. The geography column uses postal abbreviations for the states and DC. The national row sums those 51 geography rows. All percentages are rounded to one decimal place.
Related reading:
Frequently Asked Questions
How many facilities reported both IOP and PHP?
In the 2024 public-use survey file, 2,259 records in the 50 states and DC reported both intensive outpatient treatment and SAMHSA's combined day treatment or partial hospitalization option. That was 16.7% of 13,508 records with yes or no answers to both items.
Can the survey tell how many facilities offered PHP on its own?
The outpatient substance use question groups day treatment and partial hospitalization in one response option. The count describes the combined option. The public-use field cannot separate PHP from other day treatment.
Does offering both services show that patients step down between them?
The facility responses show that both services were reported at the same facility. They do not track patient transitions, staffing, appointment availability, or whether the services use a shared record.
How do the 2025 counts relate to the 2024 overlap?
SAMHSA's 2025 published totals count intensive outpatient and day treatment or partial hospitalization separately across its annual-report population. The 2024 analysis joins two answers on the same public-use record in the 50 states and DC. The published totals alone cannot establish the overlap.
