About Us

About Oasis Medical Group — Vista, CA

Compassionate Care, Rooted in Vista.

There is a kind of medical care that most people have stopped expecting. Care where the doctor actually remembers your name. Where you are not rushed out the door after seven minutes with a prescription and no explanation. Where your questions are welcomed, your concerns are taken seriously, and your treatment plan is built around your life — not a generic tool.

That is the kind of care Dr. Kareem Moasis, MD, and his team built Oasis Medical Group to provide.

Oasis Medical Group is a physician-owned private internal medicine and primary care clinic serving Vista and all of Encinitas, Fallbrook, and North County San Diego. Since opening its doors, Oasis has become the practice patients turn to when they are tired of feeling overlooked by the healthcare system — and when they are ready for a physician who will genuinely fight for their health.

Whether you are coming in for a routine annual physical, managing a complex chronic condition, seeking addiction recovery through our MAT program, or exploring the latest in wellness and longevity medicine, Addiction Medicine — you will find the same thing every time you walk through our door. A physician who listens. A team that cares. And a commitment to your health that does not end when the appointment does.

Oasis Medical Group clinic in Vista, CA
Our Mission

To deliver high-quality, personalized, evidence-based healthcare that empowers every patient to take control of their health and live their fullest life.

We believe that access to a physician who truly knows you — your history, your goals, your fears, and your values — is not a luxury. It is a fundamental part of good medicine. Every decision we make at Oasis is guided by that belief.

We do not measure success by how many patients we see in a day. We measure it by how many patients leave feeling heard, helped, and hopeful.

Our Vision

Our vision is to be the most trusted private medical practice in Encinitas, Fallbrook, and North County San Diego — a place where every patient, regardless of their background, their health challenges, or their history, receives the same standard of compassionate, expert, physician-led care.

We envision a healthcare experience where addiction medicine carries no stigma, where mental health is treated with the same urgency as physical health, where longevity medicine is accessible to everyone who wants it, and where the relationship between patient and physician is built on genuine trust — not transactional efficiency.

Oasis is not just a clinic. It is what medicine is supposed to look like.

Dr. Kareem Moasis, MD, and his team — Oasis Medical Group

Meet your physician

Dr. Kareem Moasis, MD

Dr. Kareem Moasis is an Internal Medicine/Primary Care Physician with advanced specialty training in Internal Medicine, Addiction Medicine, Pain Medicine, Longevity Medicine, and Behavioral Health. He is the founder and Medical Director at Oasis Medical Group — and the reason patients drive from across Encinitas, Fallbrook, and North County San Diego to receive his medical care.

Dr. Moasis completed his medical training and residency with a focus on comprehensive, relationship-based internal medicine at brooklyn hospital center in brooklyn, New York. He was drawn to internal medicine because of its breadth — the ability to care for the whole patient across every system of the body — and to addiction medicine because of the profound impact that effective treatment can have on a patient's entire life trajectory.

What sets Dr. Moasis and his team apart is not just his clinical knowledge — it is his approach. He practices medicine the way it was meant to be practiced. He sits down. He listens. He asks the questions that other doctors skip. He explains things in plain language. And when you leave his office, you leave with a plan you understand and a physician you can trust.

Oasis Medical Group

Meet The Team

  • Dr. Kareem Moasis, MD

    Dr. Kareem Moasis, MD

    Founder & CEO — Internal Medicine Specialist

  • Ned Moasis

    Co-Founder and Vice President

  • Tess Brown

    Office Manager

  • Lisa Rose

    Product Manager

  • Kevin Nye

    HR Lead

  • Alex Young

    Customer Support Lead

In Dr. Moasis Own Words

"I became a physician because I believe that medicine — real medicine — is one of the most powerful forces for good in a person's life. Not just treating a diagnosis on a chart, but genuinely improving the quality of someone's daily existence.

Too many of my patients come to me after years of feeling dismissed, rushed, or simply not believed. They have been handed prescriptions without explanations, referrals without follow-up, and diagnoses without a real plan. That is not acceptable to me.

At Oasis, every patient gets my full attention. That is not a marketing line — it is a commitment I make to everyone who walks through our door. Your health matters. Your questions matter. Your recovery, your wellbeing, and your future matter. And I will show up for you every single time."

Dr. Kareem Moasis, MD

Founder, Oasis Medical Group

Why Choose Oasis Medical Group?

There are hundreds of medical practices in San Diego County. Here is why patients consistently choose Oasis — and why they stay.

  1. You Always See Dr. Moasis and his team

    At most practices you see whoever is available — a rotating PA, an NP you have never met, a physician who glances at your chart for thirty seconds before walking in. At Oasis every appointment is with Dr. Moasis and his team directly. Every time. No exceptions.

  2. Same-Day Appointments & Walk-Ins Welcome

    Health does not wait for a convenient time. We offer same-day appointments for patients who need to be seen today and walk-in availability during office hours so you are never turned away when you need care.

  3. Truly Personalized Care

    No two patients are the same. Dr. Moasis and his team does not apply protocols — he applies judgment, experience, and genuine curiosity about your specific situation. Your treatment plan is built around you.

  4. A Private Practice That Puts You First

    Oasis is not a corporate medical group. There are no quotas, no efficiency metrics, and no administrators telling Dr. Moasis and his team how long he can spend with a patient.

  5. Comprehensive Services Under One Roof

    From primary care and urgent care to addiction medicine, mental health, TMS therapy, ketamine, TRT, peptide therapy, PRP, pain management, and DOT physicals — coordinated by one physician who knows your full picture.

  6. Evidence-Based Medicine with a Human Touch

    Dr. Moasis and his team practices medicine grounded in clinical evidence — not trends, not marketing, and not guesswork. Every treatment is backed by research and delivered with compassion and transparency.

  7. Accepting Most Major Insurance + Affordable Cash-Pay

    We accept Aetna, Anthem Blue Cross, Blue Shield, Cigna, United Healthcare, Tricare, Medicare, and most PPO plans. Transparent cash-pay packages are available for patients without insurance.

AetnaAnthem Blue CrossBlue ShieldCignaUnited HealthcareTricareMedicarePPO Plans

Our Values

Everything at Oasis Medical Group is built on four core values:

Compassion

We meet every patient where they are — without judgment, without assumptions, and with genuine empathy for what they are going through.

Privacy

Your health is your business. Your visits, diagnoses, and treatment are handled with complete discretion — especially for addiction and behavioral health.

Non-Judgment

No condition, history, or life circumstance will ever change the quality of care you receive. You will never feel judged here.

Same-Day Access

Healthcare delayed is healthcare denied. When you need care, you should be able to get it the same day — not three weeks from now.

Serving Vista and All of Encinitas, Fallbrook, and North County San Diego

Oasis Medical Group is conveniently located at 906 Sycamore Ave, Suite 201 in Vista, California — centrally positioned to serve patients from Oceanside, Carlsbad, San Marcos, Escondido, Encinitas, Fallbrook, Bonsall, and beyond.

We are open Monday through Friday from 8:30 AM to 5:00 PM. Same-day appointments are available and walk-ins are always welcome.

If you are looking for a physician who will actually show up for your health — you found one.

FAQ

Frequently Asked Questions About Oasis Medical Group

Yes. Dr. Moasis and his team are currently welcoming new patients across all services including primary care, internal medicine, MAT/Suboxone treatment, wellness, and behavioral health. Call 760-691-1901 or use our online contact form to schedule.

We accept most major PPO insurance plans including Aetna, Anthem Blue Cross, Blue Shield, Cigna, United Healthcare, Tricare, and Medicare. We do not currently accept Medi-Cal or Medicaid. Affordable cash-pay packages are available for patients without insurance.

We are located at 906 Sycamore Ave, Suite 201, Vista, CA 92081. We are easily accessible from the I-78 corridor and serve patients from throughout Encinitas, Fallbrook, and North County San Diego.

Monday through Friday 8:30 AM–5:00 PM. We are closed on weekends. Same-day appointments are available and walk-ins are welcome during office hours.

Yes — every single visit. Dr. Moasis and his team personally conduct every appointment at Oasis. You will never be seen by a rotating provider or mid-level staff without Dr. Moasis and his team's direct involvement.

Simply call 760-691-1901 or fill out our online contact form. Our team will schedule your new patient visit — often same-day or next-day. No referral is required for most services.

Ready to Experience Healthcare the Way It Should Be?

New patients welcome. Same-day appointments available. A physician who actually listens — right here in Vista, CA.

  • 906 Sycamore Ave, Suite 201, Vista, CA 92081
  • Monday–Friday 8:30 AM–5:00 PM

What our patients say

5.0 average · 74+ Google reviews

"We had the most incredible experience with Dr Moasis. I've never met anybody so kind and considerate and professional — so grateful to be in his practice."

anthony frescura
Google Review · 3 weeks ago

"Dr. Moasis and his team are truly a blessing. I recently moved to San Marcos and needed a PCP closer to home. Dr. Moasis and his team truly cares for his patients and is amazing at explaining things in a way that is easy to understand. Definitely recommend!!"

Nick Gonzales
Google Review · 2 months ago

"AMAZING DOCTOR! He's very attentive and carries great energy to the conversation."

Alejandro Cobian
Google Review · a month ago

"So attentive and patient! :)"

Tiana DeMarco
Google Review · a week ago