California holds 1,198 of the 13,460 addiction treatment facilities in SAMHSA’s 2025 national directory — 8.9% of the country. It also holds 335 of the 1,290 facilities nationwide that accept private health insurance and no public coverage at all: 26% of the national total, in a state with under a tenth of the facilities. California runs the most expansive Medicaid program in the United States, and ranks third from bottom among all states for the share of treatment facilities that accept it.

The further up the price ladder, the larger California looms

California is the largest treatment market in the country by facility count, ahead of New York, Illinois, Florida and Pennsylvania. A large state holding a large share of anything is unremarkable. What is notable is how the share changes depending on which part of the system you count.

California carries roughly one in eleven of the country’s treatment facilities, one in six of its residential beds, and one in four of the facilities that will not accept public coverage. The state is not simply large. It is differently composed.

The Medi-Cal paradox

California operates the most generous Medicaid program in the United States. Medi-Cal carries no premium and no copayment for substance use disorder treatment, and the state extended full-scope eligibility to income-eligible adults regardless of immigration status. On paper, no state offers better coverage for addiction treatment.

Among the 49 states with at least 50 facilities in the directory, California ranks third from bottom for the share of facilities accepting Medicaid, behind only Hawaii and Puerto Rico. It ranks fourth from bottom on Medicare.

New York is the control group

The obvious explanations for California’s position are that it is large, expensive, and politically inclined toward a big private sector. New York is the second largest treatment market in the country, has comparable costs, and expanded Medicaid on a similar timetable. It looks nothing like California.

New York has 94.3% Medicaid acceptance and 3.6% private-insurance-only facilities. Ohio, with a market almost as large as Florida’s, sits at 95.7% and 3.3%. California and Florida are the outliers, and they are outliers together: both above 27% private-only, both above 53% for-profit among residential facilities, and both in the bottom five nationally for Medicaid acceptance.

Where in California

The concentration is not spread across the state. It sits in a small number of coastal Southern California markets.

Every one of the 19 facilities listed in Malibu accepts private insurance and no public coverage. In Bakersfield, none of the 17 facilities does. Both are in California; they are functionally in different countries. Orange County carries the densest cluster of private-pay capacity in the state, with Costa Mesa and Newport Beach both above two thirds, while San Diego and the Central Valley look much more like the national picture.

What might explain it

The directory records what facilities accept, not why. Three explanations are consistent with the data and none is established by it.

Medi-Cal reimbursement rates for residential treatment are set by California and administered at county level, and providers have argued for years that they sit below the delivered cost of a bed. A facility declining Medi-Cal may be responding to a rate rather than to a population.

California also has an unusually large commercial treatment sector: 53.4% of its residential facilities are for-profit, against 36.6% nationally. Where a market can sustain private-pay demand, the incentive to seek Medi-Cal certification is weaker.

And the state’s public system routes people differently. The Drug Medi-Cal Organized Delivery System places Medi-Cal members through county assessment rather than through direct facility admission, which means a substantial share of publicly funded treatment flows through a channel that private-pay facilities never see. A facility can be full without ever touching public coverage. That structure is described in more detail on our California directory page.

What this analysis does not show

This is a count of reported payment acceptance, not a measure of quality, capacity or access. A facility declining Medicaid is not necessarily providing worse care, and a state with high Medicaid acceptance is not necessarily serving people better: it may simply have fewer beds. Nothing here ranks individual facilities.

The directory includes only facilities that responded to the 2024 survey and were approved for inclusion by their state substance use agency, so it is not a complete census, and response rates vary between states. Every field is self-reported, which means a facility may accept coverage it did not record. City-level figures cover facilities listed under that city name and will not match county or metropolitan boundaries.

If you are looking for treatment in California

If you have Medi-Cal, the county access line is usually the right first call rather than the last. Counties participating in the Drug Medi-Cal Organized Delivery System are required to assess you and place you at the level of care that assessment indicates, anywhere in the county. That is a wider search than calling facilities individually, and it costs nothing.

If you are uninsured, ask about sliding fee scales and state block grant funded beds as separate things, and see our guide to free and state-funded recovery resources in California. If you hold commercial coverage, our coverage checker and out-of-pocket estimator will give you a working figure before you call.

Facility listings across Southern California and Northern California show which coverage each provider accepts. Facilities carrying our verified badge have had their credentials independently checked.

Methodology

We analyzed the complete 2025 National Directory of Drug and Alcohol Use Treatment Facilities published by the Substance Abuse and Mental Health Services Administration, covering 13,460 facilities across all fifty states, the District of Columbia and five territories. The directory reflects facility responses to the 2024 National Substance Use and Mental Health Services Survey. We parsed each facility service code string and classified a facility as private-insurance-only where it carries the code for private health insurance but none of the codes for Medicaid, Medicare, or state-financed health insurance other than Medicaid. Residential classification includes all four residential service settings recorded in the survey. State rankings cover the 49 states with at least 50 facilities in the directory. City figures cover California cities with at least 15 listed facilities and use the city name as recorded by the facility.

References

1. Substance Abuse and Mental Health Services Administration. National Directory of Drug and Alcohol Use Treatment Facilities, 2025. Rockville, MD: Center for Behavioral Health Statistics and Quality, SAMHSA.
2. Substance Abuse and Mental Health Services Administration. National Substance Use and Mental Health Services Survey (N-SUMHSS): 2024 Data on Substance Use and Mental Health Treatment Facilities. Rockville, MD: SAMHSA, 2025.
3. California Department of Health Care Services. Drug Medi-Cal Organized Delivery System: county implementation plans and participating counties.
4. National Institute on Drug Abuse. Words Matter: Preferred Language for Talking About Addiction. Bethesda, MD: NIDA.