Mental Health Treatment in Southern California

Alter Behavioral Health provides personalized mental health treatment and rehab for adults facing psychiatric, trauma, addiction, and co-occurring disorders. With residential, crisis stabilization, partial hospitalization, and intensive outpatient programs, care is tailored around each person’s needs. Southern California facilities offer evidence-based therapies, compassionate clinical support, and a full continuum designed to support lasting recovery and stability.

Mental health treatment team meeting with an adult client in a calm therapy setting

Our Mental Health Treatment Services

Comprehensive behavioral health programs support adults across different levels of psychiatric, trauma, addiction, and co-occurring care needs.

Residential Treatment

Structured residential care provides comprehensive support for adults with complex mental health, trauma, and co-occurring substance use disorders in a supportive treatment environment.

Crisis Stabilization

Crisis Stabilization and Intervention offers acute clinical assessment, risk assessment, safety planning, psychiatric stabilization, and family support for adults experiencing mental health crises.

Partial Hospitalization

PHP provides intensive outpatient treatment for adults who need substantial clinical support without residential placement, using CBT, DBT, EMDR, family therapy, and related approaches.

Intensive Outpatient

IOP offers structured mental health and substance use treatment at a lower level of care than residential or partial hospitalization, with individualized therapeutic support.

Dual Diagnosis Treatment

Dual-diagnosis care addresses addiction alongside conditions such as depression, anxiety, trauma, PTSD, bipolar disorder, and other mental health concerns.

Aftercare Support

Aftercare planning, local support groups, and recovery resources help clients practice life skills, transition toward everyday routines, and pursue sustained stability after discharge.

Whole-Person Treatment

Personalized Care For Lasting Recovery

Alter Behavioral Health combines evidence-based clinical therapies, compassionate support, and individualized care plans across a full continuum of mental health and addiction treatment. Programs address the person rather than symptoms alone, incorporating clinical, holistic, and family supports. At Southern California facilities, adults can access care for psychiatric, trauma, substance use, and co-occurring disorders through a coordinated treatment model.

Adult client speaking with a behavioral health therapist during individualized treatment
Support That Continues

Recovery Journeys

Personalized programs help clients and families move toward healing, improved functioning, and sustained recovery.

"I had a great experience in Alter's PHP/IOP/residential programs. I learned practical strategies to manage my mental health and received the care and support I needed to move forward with my life. The staff is dedicated and the therapists are exceptional. I would highly recommend Alter to anyone seeking treatment!"

Tory M.

"Absolutely amazing. The staff is more than accommodating. They really make your experience at this facility the best it can be. They pay attention to close detail and are on top of the game. My admin Jordan walked me through the steps and answered all of my questions in full..."

Taylor

"This is by far the best mental health treatment center I’ve experienced. From the admission staff to the therapists and counselors, I was treated with the utmost care and compassion. The staff and facilities are amazing and provided me with all the support and tools I needed to feel the..."

Bryan W.

"I had a beautiful experience here and the staff was amazing. Everyone was so caring and sweet. They’ve turned my life around for the better."

Ellie A.

"Alter has some of the best and caring staff in the medical industry. They helped save my life from emotional episodes and I am grateful to them. I highly recommend Alter if you are seeking mental health treatment or do not know where to turn. Thank you."

Eric S.
Eric S.

"I had a great experience in Alter's PHP/IOP/residential programs. I learned practical strategies to manage my mental health and received the care and support I needed to move forward with my life. The staff is dedicated and the therapists are exceptional. I would highly recommend Alter to anyone seeking treatment!"

Tory M.

"Absolutely amazing. The staff is more than accommodating. They really make your experience at this facility the best it can be. They pay attention to close detail and are on top of the game. My admin Jordan walked me through the steps and answered all of my questions in full..."

Taylor

"This is by far the best mental health treatment center I’ve experienced. From the admission staff to the therapists and counselors, I was treated with the utmost care and compassion. The staff and facilities are amazing and provided me with all the support and tools I needed to feel the..."

Bryan W.

"I had a beautiful experience here and the staff was amazing. Everyone was so caring and sweet. They’ve turned my life around for the better."

Ellie A.

"Alter has some of the best and caring staff in the medical industry. They helped save my life from emotional episodes and I am grateful to them. I highly recommend Alter if you are seeking mental health treatment or do not know where to turn. Thank you."

Eric S.
Eric S.

"I had a great experience in Alter's PHP/IOP/residential programs. I learned practical strategies to manage my mental health and received the care and support I needed to move forward with my life. The staff is dedicated and the therapists are exceptional. I would highly recommend Alter to anyone seeking treatment!"

Tory M.

"Absolutely amazing. The staff is more than accommodating. They really make your experience at this facility the best it can be. They pay attention to close detail and are on top of the game. My admin Jordan walked me through the steps and answered all of my questions in full..."

Taylor

"This is by far the best mental health treatment center I’ve experienced. From the admission staff to the therapists and counselors, I was treated with the utmost care and compassion. The staff and facilities are amazing and provided me with all the support and tools I needed to feel the..."

Bryan W.

"I had a beautiful experience here and the staff was amazing. Everyone was so caring and sweet. They’ve turned my life around for the better."

Ellie A.

"Alter has some of the best and caring staff in the medical industry. They helped save my life from emotional episodes and I am grateful to them. I highly recommend Alter if you are seeking mental health treatment or do not know where to turn. Thank you."

Eric S.
Eric S.
The Alter Difference

Why Choose Alter Behavioral Health?

Care is designed around clinical needs, personal goals, and meaningful long-term support.

Full Continuum

Access residential, crisis, PHP, IOP, outpatient, transitional, and therapeutic support services.

Personalized Care

Individualized plans are overseen by psychiatrists and doctorate- or master’s-level clinicians.

24/7 Support

Clinical and admissions support is available around the clock for Southern California and nationwide clients.

Evidence-Based

CBT, DBT, trauma-focused therapies, and holistic supports address complex behavioral health needs.

Meet The Care Team

Experienced leaders guide compassionate, evidence-based behavioral health treatment.

Portrait of Michael Castanon, Founder and CEO of Alter Behavioral Health

Michael Castanon

Founder and CEO

Michael Castanon is the Founder and CEO of Alter Behavioral Health, a Southern California-based organization dedicated to advancing the future of mental health care. With a vision rooted in combining scientific rigor, genuine compassion, and lasting transformation, Michael has built Alter Behavioral Health into a comprehensive provider offering a full continuum of care, including residential treatment, partial hospitalization, intensive outpatient, and outpatient services. He is committed to ensuring that every client receives individualized, evidence-based treatment delivered by skilled psychiatrists and clinicians. Under his leadership, the organization has earned The Joint Commission's Gold Seal of Approval and recognition as a Care Predictor Certified Treatment Facility. Michael's mission is to empower individuals and families across Southern California and nationwide to heal, thrive, and achieve sustained recovery through innovative, whole-person care.

Frequently Asked Questions

What mental health treatment programs does Alter Behavioral Health offer?

Alter Behavioral Health offers residential mental health treatment, Crisis Stabilization and Intervention, Partial Hospitalization Programs, Intensive Outpatient Programs, outpatient and transitional support, and dual-diagnosis treatment. Available care depends on clinical needs and level of acuity. Programs address mental health, trauma, substance use, and co-occurring disorders through individualized plans and evidence-based therapies.

Who can benefit from mental health treatment and rehab?

What is the difference between residential treatment, PHP, and IOP?

Does Alter Behavioral Health treat co-occurring addiction and mental health conditions?

What therapies are used in treatment?

Is crisis stabilization available for acute mental health needs?

Does Alter Behavioral Health accept insurance?

How can someone begin mental health treatment at Alter Behavioral Health?

Have Questions About Treatment?

Speak with Alter’s admissions team about care options and next steps.

Recognized & Accredited

Awards and Recognition

The Joint Commission Gold Seal of Approval accreditation

Gold Seal of Approval accreditation from The Joint Commission

Accreditation identified in company credentials.

Care Predictor Certified Treatment Facility recognition

Care Predictor Certified Treatment Facility

Recognition listed among company awards and recognitions.

The Joint Commission National Quality Approval recognition

The Joint Commission National Quality Approval

Recognition listed among company awards and recognitions.

DHCS recognition and certification

DHCS recognition and certification

Recognition and certification listed by the company.

Best Residential Mental Health Treatment Center nomination

Nominated for Best Residential Mental Health Treatment Center in California, 2024

Recognition nomination listed by the company.

Start A Path Toward Healing

Connect with Alter Behavioral Health to discuss treatment options, insurance verification, and confidential enrollment.

Contact Us Today

For immediate assistance, feel free to give us a direct call at (866) 248-9285.