Mental health and substance use disorder treatment accounts for 10% of all commercial inpatient hospital stays in the United States, about 32 admissions per 10,000 insured enrollees annually, according to Peterson-KFF Health System Tracker analysis of 2023 commercial claims data. For the people navigating those admissions, and their families, the financial side of the experience is often as disorienting as the clinical one.
This article lays out what inpatient mental health and substance use treatment actually costs, what patients pay out of pocket, how different diagnoses and facility types affect the bill, and what to look for in your health plan before you need this care.
Source: Peterson-KFF Health System Tracker, "Cost and utilization of inpatient mental health and substance use treatment," June 2026. Based on 2023 commercial insurance claims.
Mental Health vs. Substance Use: How Costs Compare
Mental health and substance use disorder admissions occur at roughly equal rates, 54% mental health, 46% substance use, and at nearly identical average total costs:
| Admission type | Avg. total cost | Avg. patient out-of-pocket | Median length of stay |
|---|---|---|---|
| Mental health | $15,900 | $1,300 | 6 days |
| Substance use disorder | $15,500 | $1,400 | 6 days |
These are averages for people with commercial insurance. Actual costs vary significantly based on the specific diagnosis, the type of facility, and whether the facility is in-network. A quarter of patients paid $1,900 or more out of pocket for either type of admission.
Patients covered approximately 9% of the total hospitalization cost themselves. The remaining 91% was paid by the insurer. While 9% sounds modest, on a $15,900 average bill that is $1,431, and for higher-cost admissions, the patient share can climb substantially.
Cost by Diagnosis: A Wide Range
The average masks dramatic variation by diagnosis. Depression is the most common reason for a mental health inpatient stay (45% of all mental health admissions), but eating and feeding disorders are far and away the most expensive:
Average Total Cost by Diagnosis (2023)
Source: Peterson-KFF Health System Tracker, June 2026. Eating/feeding disorder costs reflect longer and more intensive stays.
Eating and feeding disorder admissions cost nearly three times the average mental health admission. This reflects the medically complex nature of these conditions, which often require intensive nutritional support and longer stays alongside psychiatric care.
Cost by Facility Type
Where a patient receives care also drives significant cost differences:
| Facility type | Avg. total cost per stay |
|---|---|
| Residential treatment (substance use) | $21,900 |
| General hospital psychiatric unit | $14,900 |
| Detoxification facility | $14,900 |
| Specialized psychiatric facility | $13,400 |
Residential treatment for substance use disorder is the most expensive setting, averaging $21,900 per stay, partly because stays are longer, averaging 19 to 21 days compared to the 6-day median for acute inpatient stays. Specialized psychiatric facilities, despite providing intensive care, are modestly less expensive than general hospital psychiatric units on average.
Who Is Being Admitted: Demographics
Mental health and substance use disorder admissions look quite different in terms of who is being treated:
Mental Health Admissions
- 56% female 44% male
- Peak age group: 18–24 years (36% of admissions)
- Depression is most common diagnosis (45%)
- 82% experience a single annual stay
- 66% come through the emergency department
Substance Use Admissions
- 68% male 32% female
- Peak age group: 35–44 years (26% of admissions)
- Alcohol use disorder is most common (74%)
- 65% experience a single annual stay
- 32% come through the emergency department
The high rate of mental health admissions among 18–24 year olds is notable. Young adults, many of whom may be on a parent’s plan under the ACA’s dependent coverage rule (through age 26) or recently aged off parental coverage, represent the most common age group for inpatient mental health care. Understanding plan benefits and network coverage is especially important for this group.
The Emergency Department Pathway
66% of mental health inpatient admissions involve time in the emergency department before or during the hospitalization. This has two practical implications:
First, admissions that go through the ED are more expensive overall because emergency department charges layer on top of the inpatient stay. Second, going to the ED in a mental health crisis does not guarantee you will end up at an in-network inpatient facility. Patients stabilized in the ED may be transferred to wherever a psychiatric bed is available, which may be out of network.
The No Surprises Act prohibits balance billing for emergency services regardless of whether the facility or provider is in-network. If you receive mental health care in an emergency setting at an out-of-network facility, the insurer must cover the care at in-network rates, and the provider cannot bill you the difference. This protection applies to emergency departments, but the rules around subsequent inpatient stays following an ED visit are more complex. Always contact your insurer as soon as possible to arrange in-network transfer if you are admitted from an out-of-network ED.
This is general information, not legal or medical advice. Contact your insurer directly about your specific plan and situation.
What Your Health Plan Actually Covers, and What to Check
Federal mental health parity law requires that health plans cover mental health and substance use disorder treatment on terms no more restrictive than medical and surgical coverage. In practice, this means:
- Your plan cannot impose day limits on inpatient mental health stays that it does not also apply to medical stays
- Prior authorization requirements must be comparable to those for medical/surgical stays
- Out-of-pocket costs (copays, coinsurance, deductibles) must be applied consistently across mental health and medical benefits
Despite these protections, network adequacy remains a real problem for mental health care. Psychiatric bed availability is constrained in many markets, and the number of in-network psychiatric facilities is often smaller than in-network hospital options for medical care. Before you need inpatient mental health care, it is worth knowing:
- Which inpatient psychiatric facilities are in your network. Call your insurer’s member services line and ask specifically for in-network inpatient behavioral health facilities, not just outpatient therapists.
- Whether your plan requires prior authorization for inpatient mental health stays and what the process is, including the emergency exception process.
- How your deductible and out-of-pocket maximum interact with mental health stays. In most plans, mental health inpatient costs count toward the same deductible and out-of-pocket maximum as medical costs. A patient who has already met their out-of-pocket maximum from medical care in the same plan year may owe nothing for a mental health admission.
- Whether your plan covers residential treatment separately from acute inpatient stays. Some plans require different authorization or have different cost-sharing for residential versus acute inpatient mental health care.
How to Lower Your Out-of-Pocket Costs
The average patient out-of-pocket cost of $1,300 for a mental health admission assumes the stay is in-network. Going out of network dramatically increases what you owe. Steps to protect yourself financially:
- Use in-network facilities whenever possible. The network tier is the single biggest driver of patient cost for inpatient mental health care.
- Track your deductible and out-of-pocket maximum for the year. If you have already paid significant medical bills earlier in the plan year, you may be close to your out-of-pocket maximum, which caps what you owe for any additional covered care.
- Request an itemized bill. Mental health facility bills can contain errors. Review each charge and compare it against your explanation of benefits (EOB) from the insurer.
- Ask about financial assistance programs. Non-profit psychiatric hospitals and many residential treatment centers offer income-based assistance for patients who cannot afford their cost share.
- Consider a plan with a lower out-of-pocket maximum at renewal. If you or a family member has ongoing mental health treatment needs, a Gold plan’s higher premium may cost less overall than a Silver or Bronze plan with a higher cost share for frequent care.
If you are choosing a health plan and know that mental health or substance use treatment may be needed, call (713) 575-9904. An independent broker can compare plans specifically on their behavioral health network, cost-sharing structure, and prior authorization requirements before you enroll.