

Mental health care in Santa Monica is accessible through Headway's network of 933 providers. Whether you're in Brentwood, Pacific Palisades, West LA, or beyond, find compassionate support through virtual or in-person sessions covered by insurance with copays starting at $0.
Hi, I'm Cassie (Cassandra), a board certified Psychiatric Mental Health Nurse Practitioner with over five years of experience in mental health care.
I believe mental health treatment should feel supportive, collaborative, and free of judgment. Every person has a unique story, and I take the time to listen, understand your goals, and create a treatment plan tailored to your individual needs.
I specialize in the treatment of anxiety, depression, ADHD, stress, burnout, sleep concerns, and other common mental health conditions. Through thoughtful psychiatric evaluation and medication management, my goal is to help you find clarity, restore balance, and move forward with confidence.
Whether you are seeking support for the first time or looking for a fresh approach to your mental health care, I strive to provide a comfortable and welcoming space where you feel heard, respected, and supported.
I look forward to partnering with you on your journey toward improved mental wellness and helping you build the tools needed to thrive in everyday life.
I am dual board-certified as a psychiatric-mental health nurse practitioner and family nurse practitioner with a passion for functional medicine. I believe mental health is best addressed by looking at the whole person—mind, body, and soul. I’ve been working in healthcare for over 20 years. Through my experience in mental health, I have the privilege of working with adults aged 21–60. I support individuals navigating anxiety, depression, ADHD, PTSD, OCD, mood disorders, and eating disorders, offering a safe and respectful space for growth and healing.
I am a board-certified Psychiatric Mental Health Nurse Practitioner (PMHNP-BC) with a DNP (Doctor of Nursing Practice) degree from the University of Massachusetts Global. I have experience working with adolescents and adults in multiple settings facing various complex mental health issues, including OCD, depression, anxiety, ADHD and mood disorders.
With over three decades of hands-on clinical and nursing leadership experience, I am a Doctorally prepared and Board-Certified Psychiatric Mental Health Nurse Practitioner. My professional journey has been devoted to helping individuals overcome emotional distress, regain control of their lives, and achieve mental and physical well-being.
With certification as a Psychiatric Mental Health Nurse Practitioner and a Doctorate in Healthcare Administration, I bring a holistic, integrative perspective to mental health. My practice philosophy blends evidence-based psychiatric medicine with empathy, respect, and patient collaboration. Healing begins with understanding, and I take time to listen, educate, and partner with my patients to develop individualized, sustainable treatment plans.
Dr. Adatsi has a clear mission: to provide comprehensive care that not only alleviates symptoms but also enhances quality of life, restores confidence, and promotes resilience. His commitment to your well-being is unwavering.
Whether you’re navigating life transitions, managing chronic stress, or seeking clarity amid emotional challenges, I’m here to guide you toward balance, stability, and renewed hope.
Specialties:
I have worked in behavioral health for over 15 years and have learned that listening to patients and understanding their unique goals is essential to achieving positive outcomes.
Great to meet you! I am Tammy D. Moijueh, Psychiatric Mental Health Nurse Practitioner. I am pleased to serve with the best of my expertise and commitment to your well-being, offering training in outpatient psychiatry, ambulatory care, and telemedicine. My goal is to make communications easy, insightful, and encouraging. My Doctorate in Nursing Practice from Charles R. Drew University of Medicine and Science, combined with over 10 years of experience in the field, enhances behavioral health training and promotes the most positive treatment outcomes.
If you are struggling with depression, anxiety, stress, or life's emotional challenges, please know you don’t have to carry this weight alone. As a Psychiatric Nurse Practitioner, I am dedicated to helping you reclaim your life. My practice is built on a foundation of deep empathy and genuine care. I treat you as a whole person, not just a set of symptoms. Together, we will navigate your challenges using evidence-based treatments tailored to your unique story and goals. Your mental health journey deserves a safe space, and I am here to provide exactly that as we work toward your healing.


Headway makes it easy to find support for your mental health — from finding the right provider, to understanding costs, to scheduling with ease.
Finding the right psychiatrist in Santa Monica starts with understanding what kind of care you need. Psychiatrists are medical doctors who can diagnose mental health conditions, prescribe medication, and monitor how those medications are working over time. If you're looking for help with anxiety, depression, ADHD, bipolar disorder, or medication management, a psychiatrist may be the right fit. Psychiatric nurse practitioners (PMHNPs) can also evaluate, diagnose, and manage medication and are another option available on Headway.
With many mental health providers practicing across Santa Monica and the Westside — from Brentwood and Pacific Palisades to Venice and Culver City — narrowing your search can take time. Consider what matters most to you, whether that's a provider who specializes in a specific condition, someone who offers virtual sessions, or a prescriber who practices near your neighborhood. Reading a provider's bio can help you understand their approach and decide if they're a good match before you book.
Psychiatry in Santa Monica can be expensive without insurance. Using your in-network benefits is one of the most reliable ways to lower your out-of-pocket costs. On Headway, you can enter your insurance details to see estimated session costs upfront, and many patients pay as low as $0 per session. Nationally, Headway partners with over 100 insurance plans, making it easier to find a psychiatrist who is both the right clinical fit and covered by your plan.
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