Mental & Behavioral Health in Vista, CA
Compassionate care for anxiety, depression, and mood disorders.
You Deserve to Feel Like Yourself Again
Mental health is health. Full stop. Yet for too many people, getting real help feels complicated, stigmatized, or simply out of reach. You spend weeks trying to get an appointment, end up seeing someone who barely knows your name, and leave with a prescription and zero explanation of what is actually going on.
That is not how it works at Oasis Medical Group.
Dr. Kareem Moasis, MD, and his team takes mental and behavioral health seriously — treating it with the same level of attention, personalization, and medical rigor as any physical condition. Whether you are struggling with anxiety that has gotten out of control, depression that makes getting out of bed feel impossible, mood swings you cannot explain, or stress that has simply built up too long — we want to help you get back to yourself.
Our approach is physician-led, private, and completely judgment-free. You will never feel rushed, dismissed, just another chart number. Vista and Encinitas, Fallbrook, and North County San Diego residents have access to compassionate behavioral health care right here — no long waitlists, no impersonal systems, no runaround.
What Is Mental & Behavioral Health Care?
Mental and behavioral health care refers to the medical evaluation, diagnosis, and treatment of conditions that affect how you think, feel, and behave. These are real medical conditions — rooted in brain chemistry, hormones, life experiences, and biology — not personal weaknesses or character flaws.
At Oasis Medical Group, mental health care is integrated into your overall health picture. Dr. Moasis and his team understands that your mental wellbeing directly impacts your physical health and vice versa. Chronic stress raises your blood pressure. Untreated depression worsens diabetes outcomes. Anxiety disrupts sleep which affects every system in your body. Treating the whole person — not just isolated symptoms — is what separates Oasis Medical Group from a standard clinic.
Our mental and behavioral health services are designed to complement your primary care, not exist in a separate silo. This integrated approach leads to better outcomes, clearer communication, and care that actually makes sense for your life.
Conditions We Treat
Dr. Moasis and his team evaluate and manages a broad range of mental and behavioral health conditions including:
- Depression — Persistent sadness, hopelessness, loss of interest in things you used to enjoy
- Anxiety disorders — Generalized anxiety, panic attacks, social anxiety, health anxiety
- Mood disorders — Bipolar spectrum, cyclothymia, persistent depressive disorder
- PTSD & trauma responses — Intrusive thoughts, hypervigilance, emotional numbness
- ADHD in adults — Difficulty concentrating, impulsivity, disorganization affecting daily function
- Stress & burnout — Chronic overwhelm, emotional exhaustion, inability to decompress
- Insomnia & sleep disorders — Difficulty falling asleep, staying asleep, or feeling rested
- Substance use disorders — Including opioid use disorder treated through our MAT program
- Behavioral health affecting chronic disease — Mental health complications of diabetes, chronic pain, and hormonal imbalance
If you are not sure whether what you are experiencing qualifies — that is exactly why you schedule an appointment. You do not need a diagnosis to deserve help.
Signs You Should Seek Mental Health Support
Sometimes the hardest part is recognizing that what you are going through is more than just a rough patch. Consider reaching out to Oasis if you are experiencing any of the following:
- ✓Persistent sadness, emptiness, or hopelessness lasting more than two weeks
- ✓Anxiety that interferes with work, relationships, or daily activities
- ✓Sudden mood changes that feel outside your control
- ✓Difficulty sleeping — too much or not enough — for extended periods
- ✓Withdrawing from friends, family, or activities you used to enjoy
- ✓Using alcohol, substances, or food to cope with emotions
- ✓Physical symptoms with no clear medical cause — headaches, stomach issues, chronic fatigue
- ✓Thoughts of self-harm or feeling like a burden to others
- ✓Feeling disconnected from yourself or your surroundings
- ✓Struggling to function at work or maintain relationships
How Mental Health Care Works at Oasis
Step 1 — Comprehensive Evaluation
Your first visit focuses entirely on understanding you. Dr. Moasis and his team conduct a thorough mental health evaluation — exploring your symptoms, their history, what makes them better or worse, your lifestyle, medications, and any previous treatment. This is a conversation, not an interrogation.
Step 2 — Ruling Out Physical Causes
One thing that sets physician-led mental health care apart is the ability to investigate physical contributors. Thyroid imbalances, hormonal deficiencies, vitamin deficiencies, and chronic inflammation can all present as depression or anxiety. Dr. Moasis and his team order appropriate labs to rule these out before or alongside behavioral treatment.
Step 3 — Personalized Treatment Plan
Your treatment plan is built around you — not a protocol. Depending on your evaluation, this may include medication management, therapy referrals, lifestyle interventions, or a combination. For patients who benefit from structured behavioral therapy, we offer psychotherapy through our dedicated psychotherapy program.
Step 4 — Medication Management If Appropriate
For patients who need medication, Dr. Moasis and his team carefully selects, prescribes, and monitors psychiatric medications. He explains what the medication does, what to expect, potential side effects, and how to tell if it is working. No prescribing and disappearing.
Step 5 — Ongoing Monitoring & Adjustment
Mental health treatment is rarely one-and-done. Dr. Moasis and his team schedule regular follow-ups to track your progress, adjust medications if needed, and make sure your treatment plan continues to serve you as your life evolves.
Advanced Treatment Options at Oasis
For patients who have not found relief through standard treatments, Oasis offers advanced evidence-based options:
TMS Therapy (Transcranial Magnetic Stimulation)
A non-invasive, FDA-approved treatment for treatment-resistant depression. TMS uses magnetic pulses to stimulate specific regions of the brain associated with mood regulation — with no medication side effects and no downtime. Many patients who have tried multiple antidepressants with little success find significant relief through TMS.
Learn more →Ketamine Therapy
For patients with severe or treatment-resistant depression, anxiety, and PTSD, ketamine therapy offers rapid symptom relief that traditional medications often cannot match. Under physician supervision at Oasis, ketamine is administered safely and monitored carefully throughout your treatment.
Learn more →MAT / Suboxone for Substance Use
If your behavioral health challenges include opioid dependence, our dedicated MAT program combines Suboxone treatment with behavioral support to help you reclaim your life — privately, compassionately, and effectively.
Learn more →Why Choose Oasis Medical Group for Mental Health Care in Vista
Physician-Led — Not a Referral Treadmill
Dr. Moasis and his team handle your evaluation, diagnosis, and treatment directly. You do not get passed around between providers or left waiting for a specialist who has a three-month waitlist.
Same-Day Appointments Available
Mental health cannot always wait. We do our best to get you seen the same day you call, especially for patients in acute distress.
Integrated Physical & Mental Health Care
Because Oasis is a full-service internal medicine practice, your mental and physical health are treated together. This is how medicine should work.
Completely Private & Judgment-Free
Everything discussed in your appointment stays between you and Dr. Moasis and his team. There is no judgment, no stigma, and no pressure. You are safe here.
Affordable Cash-Pay & Insurance Options
We accept most major PPO insurance plans and Medicare. Cash-pay options are available for patients without insurance coverage for behavioral health services.
Serving Vista, Oceanside, Carlsbad, San Marcos, Escondido & All of Encinitas, Fallbrook, and North County San Diego
One convenient location at 906 Sycamore Ave, Suite 201, Vista — accessible from across the region.
What to Expect at Your First Mental Health Visit
Your first mental health appointment with Dr. Moasis and his team typically runs 45–60 minutes. There is nothing you need to prepare — just show up honestly. Dr. Moasis and his team will guide the conversation and ask the questions that help him understand your situation fully.
- Your insurance card
- A list of any current medications
- If you have had previous mental health treatment, any records you have access to
If you are nervous about your first visit — that is completely normal. Many patients tell us the hardest part was making the call. Once you are here, most people feel a sense of relief just from being truly heard by someone who knows how to help.
Bring your insurance card, a list of any current medications, and if you have had previous mental health treatment, any records you have access to. But if you have none of that — come anyway. We will figure it out together.
Frequently Asked Questions
No referral is needed. You can call 760-691-1901 or use our online contact form to schedule directly. Same-day appointments are often available.
Yes. Your mental health records are protected by HIPAA and handled with the highest level of confidentiality. We never share your information without your explicit consent except as required by law.
Yes. As board-certified internal medicine physicians, Dr. Moasis and his team are fully qualified to prescribe and manage psychiatric medications including antidepressants, anti-anxiety medications, mood stabilizers, and sleep medications.
Oasis offers psychotherapy as part of our behavioral health program. Dr. Moasis and his team can also provide referrals to trusted therapists in the Encinitas, Fallbrook, and North County San Diego area for patients who need more intensive talk therapy alongside medical management.
It depends entirely on your individual situation. Some patients find significant relief within weeks of starting treatment. Others require longer-term management. Dr. Moasis and his team will give you an honest assessment of what to expect based on your specific condition and response to treatment.
If you are experiencing a mental health crisis, please call 988 — the Suicide and Crisis Lifeline — available 24 hours a day, 7 days a week. For emergencies call 911. Oasis is here for ongoing care and same-day appointments, but if you are in immediate danger please reach out to emergency services right away.
Take the First Step Today
You do not have to keep pushing through alone. Same-day appointments available. Completely confidential. Judgment-free care from a physician who listens.
- 906 Sycamore Ave, Suite 201, Vista, CA 92081
- Monday–Friday 8:30 AM–5:00 PM