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If you are counting on Medicaid rehab coverage to pay for treatment that handles both opioid use and a mental health condition, new research points to a gap worth understanding.
The treatment itself is covered. A large share of the staff time behind it is not, and that gap lands hardest on the clinics that serve people who cannot pay out of pocket.
What the Research Found
Researchers at RAND applied Medicare and Medicaid behavioral health integration billing rules to real records from a clinical trial, then measured how much of the delivered care the codes actually paid for.
The study covered 381 patients receiving the collaborative care model for opioid use disorder alongside depression, PTSD, or both.
It was published in Psychiatric Services in April 2026 and funded by the National Institute of Mental Health.
Two numbers stand out. About 43 percent of patients received unbillable outreach, meaning staff spent more than 15 minutes in at least one month trying to reach them before they were formally enrolled in care.
And 59 percent received care that ran past the maximum time the billing codes allow. The researchers also looked at which patients were more likely to fall outside what the codes cover.
Age, stimulant use, worry about housing, and which health system a person attended were all associated with exceeding billable time, though the strength of those links varied.
Why Unpaid Outreach Matters for Low-Cost Rehabs
The collaborative care model is a way of delivering mental health and addiction care inside a regular primary care clinic.
Instead of being referred out to a specialty program, you see your usual provider, and a behavioral health care manager coordinates your care with input from a consulting psychiatrist.
For people on Medicaid insurance or without insurance, this model often is the access point, because it does not depend on finding an available specialty bed or a provider taking new patients.
Outreach is the part that reaches people who are hardest to reach. Repeated phone calls, messages, and follow-up before someone is enrolled are exactly what it takes to engage a person who is unhoused, working unpredictable hours, or has been turned away before.
When that work is not reimbursable, a clinic serving low-income patients absorbs the cost or does less of it. The housing finding illustrates the problem plainly.
A patient worried about where they will sleep needs more staff time, not less, and that additional time is the time most likely to go unpaid.
Who Qualifies for Free or Low-Cost Treatment
None of this changes what you are eligible for today. Coverage and free care options include:
- Medicaid, which covers substance use and mental health treatment in every state, though specific benefits and enrollment rules vary
- Medicare insurance, which covers medically necessary treatment including opioid use disorder medication
- Federally qualified health centers, which are required to charge on a sliding scale based on income and cannot turn you away for inability to pay
- State-funded treatment programs and vouchers for people who are uninsured or underinsured
- Community nonprofits and peer recovery centers, which are typically free
How to Access These Resources
Practical steps, in order:
1. Check your state’s Medicaid eligibility rules, since income thresholds differ and many people who qualify have never applied
2. Ask any clinic directly whether it offers integrated behavioral health care in primary care, which is the model this research examined
3. Ask whether the clinic uses a sliding fee scale and what documentation you need to bring
4. If a clinic says it cannot take you, ask for a referral to a federally qualified health center in your area
5. Call SAMHSA’s National Helpline at 1-800-662-4357 for free, confidential referrals, available 24 hours a day
Payment Options Explained
Medicaid and Medicare work differently, and the difference matters. Medicaid is income based and administered by your state, so covered services, cost sharing, and which providers participate all depend on where you live.
Medicare is age or disability based and federal, with more consistent rules across states but its own cost sharing.
Sliding scale means a clinic sets your fee based on household income and size. Federally qualified health centers are required to offer it.
Many community mental health centers do as well, and some will reduce a fee to zero. You generally have to ask and provide proof of income, because it is rarely offered automatically.
Finding Free and Low-Cost Rehabs Near You
Cost should not be the reason you stop looking. Rehabs.org lists free, low-cost, and Medicaid-accepting treatment options nationwide, along with harm reduction services and peer recovery centers, searchable by state and city.
Search the directory for programs near you, or call
800-914-7089
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