Coastal Internal Medicine
Medical Group, Inc.
DR. O'BRIEN IS YOUR BEST SOURCE FOR INTERNAL MEDICINE NEEDS.
Checkups
Broad care for aging, mental health, and physical conditions.
Chronic Diseases
Ongoing care for diabetes, hypertension, heart disease, and COPD.
Acute Illness
Treatment of infections, flu, and sudden health concerns.
Preventative Care
Health screenings, vaccinations, and check-ups to prevent illness.
The Coastal Internal Medicine Advantage
Multiple Plans
We partner with multiple insurance providers to ensure your care is affordable and effective.
Fully Personalized Care
We’ll help to find the unique solutions to your individualized needs.
Meticulous Care
Dr. O'Brien is meticulous and comprehensive in his care for his patients. We explore every avenue of healthy solutions.
30+
Years of Experience
Over 30 years, we have thousands of success stories. When it comes to helping patients get better - Dr. O'Brien will be in your corner.
Patients Treated Like Family
We are extremely friendly, meticulous and diligent about your health, and caring about every part of your health journey. When you work with Coastal, we’ll treat you like family.
REVIEWS OF DR. O'BRIEN
Real Stories From Our Patients
1
Priscilla U.
My first visit to Coastal was fantastic! The facility is spotless, and Dr. O'Brien is an exceptional doctor who truly takes the time to listen. The staff is incredibly helpful and welcoming. I highly recommend this place and would give them 10 stars if I could!
2
C. O.
I’m truly grateful to have found Dr. O’Brien as my new primary care physician. From my very first visit, he made me feel seen and cared for. He took the time to do a thorough physical exam, ordered the necessary tests, and what really stood out personally followed up just days later to go over my results. That kind of attentiveness is rare. It’s clear that Dr. O’Brien doesn’t just treat symptoms, he builds relationships. He genuinely wants to stay connected and make sure his patients feel supported. I feel confident knowing my health is in good hands.
3
Teri R.
I've been searching for a primary care physician who will work with me and who understands my specific health needs, and I was pleased to be referred to Dr. O'Brien. He is knowledgeable, listens, and is willing to consider new ideas to support my health. Very few medical doctors are familiar with nutrition and overall metabolic health concerning a keto/carnivore diet. Dr. O'Brien is. His staff is terrific, too. Dawn and Sherese are attentive and friendly. I feel well cared for.
4
Mark B.
Dr. O’Brien has provided me with outstanding care for over the last 25 years. He has been thorough in his evaluation of my issues, provided easy to understand treatment options and followed through with thoughtful care so I have been able to live my healthiest and best life.
5
Nadine H.
A caring team ready to help you with most of your medical needs.
Takes time to listen to your questions and someone is always available to take your call. Wonderful doctor with much experience.
6
Ellen M.
I saw Dr. O’Brien for a hospital follow up and I was extremely pleased with the care I received. Dr.O’Brien always takes time to listen and never rushes through appointments. The overall experience from the front desk to follow-up was excellent. I highly recommend Dr. O’Brien to anyone looking for a kind, knowledgeable, and thorough primary care physician.
REVIEWS OF DR. O'BRIEN
Real Stories From Our Colleagues
1
"Dr. Mark Obrien and his group cared for my hospitalized patients and covered for me after-hours ever since he founded Coastal Hospitalists out of TriCity Medical Center. I never worried about the quality of care my patients received under their care as it was excellent time-and-time again. Dr. Obrien exemplifies the "gold standard" of an Internal Medicine physician. From his sincere sense of duty, empathy and compassion to his wealth of knowledge, experience and specialty contacts, he is certain to build a "gold standard" level primary care practice as well."
Wendy Shumate, MD
2
Excellent Physician!!! I am happy to endorse Dr Mark O'Brien as being one of the best medical providers I know. Not only he brings a huge amount of experience, years of practice, but He is also quite thorough and compassionate! You definitely want a physician that is caring, smart and will listen to you. Simply the best!
Victor Souza, MD
3
Dr. Mark O’Brien D.O. has been a physician at Tri City Medical Center for over 33 years. We have been colleagues, business partners and friends for all this time. I have retired this year while Mark will move on to provide outstanding outpatient care to the people of the Tri Cities area. Dr. O’Brien is kind, thoughtful and a truly talented physician. He has touched thousands of lives over his career. To the people of north San Diego County, you have a great opportunity to receive top tier primary care as he opens his new practice to new patients. I recommend him without hesitation or reservation.
Bart Day, MD
Insurance
We are contracted with:
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Medicare
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Aetna
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Anthem / Blue Cross
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Cigna
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United Healthcare
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Greater Tri-Cities IPA
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Blue Shield
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