Patient Reviews

Reviews reflect patients' level of satisfaction with the care they received from this provider. Dr. Mark Obrien xhas an overall rating of 3.7.


Dr. Mark Obrien, DO is a Doctor primarily located in Oceanside, CA, with other offices in Carlsbad, CA and Oceanside, CA (and 2 other locations). He has 27 years of experience. His specialties include Internal Medicine. Dr. Obrien is affiliated with Scripps Memorial Hospital Encinitas, Scripps Memorial Hospital La Jolla and Palomar Medical Center. He speaks English.


Patients rate and review their physicians based on criteria of care including bedside manner, doctor-patient face time, and degree of follow-up. Patients also provide their doctor with an overall ratings. Vitals analyzes these ratings annually, along with other quality measures, to identify and award the top physicians.


Find out the languages this doctor/ or staff may speak.


Learn where this doctor attended medical school.

Specialties & Expertise

Dr. Mark Obrien has the following 8 areas of expertise, 1 specialty and 1 board certification.

Internal Medicine

An internist is a physician who focuses on the diagnosis and treatment of conditions that affect the adult population—both acute and chronic.
These doctors are often who adults see as their primary physicians because they treat a broad range of illnesses that do not require surgical or specialist interventions. They also work to help a patient maintain optimal health in order to prevent the onset of disease.
In addition to treating the common cold and flu, internists also treat chronic diseases like diabetes and heart disease.


See areas of expertise for treating specific conditions, procedures and surgeries for this doctor.

Board Certification

See the board certifications this doctor has received. Board certifications provide confidence that this doctor meets the nationally recognized standards for education, knowledge and experience.

Locations & Directions

Tri-City Medical Center

4002 Vista Way
Oceanside, CA 92056

2604 El Camino Real
Carlsbad, CA 92008

Mark C Obrien

3156 Vista Way
Oceanside, CA 92056

150 Valpreda Rd
San Marcos, CA 92069

1000 Vale Terrace Dr
Vista, CA 92084

Nearby Doctors

Dr. Mark Obrien, DO is similar to these 3 Doctors near Oceanside, CA.