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License & Identifications

A medical license is required for a doctor to practice medicine in a particular state. Requirements vary by state but most require, at a minimum, post-graduate training in the doctor’s specific specialty. An NPI number is a national identifier unique to an individual health care provider and is managed by the Center for Medicare & Medicaid Services (CMS).

Patient Reviews

Patient comments (5)

The overall average patient rating of Dr. Mark O'Brien is Excellent. Dr. O'Brien has been reviewed by 14 patients who have provided 5 comments. The rating is 4.5 out of 5 stars.

Patient Ratings
Ease of Appointment 4.6
Promptness 4.4
Courteous Staff 4.8
Accurate Diagnosis 5.0
Bedside Manner 5.0
Spends Time with Me 5.0
Follows Up After Visit 5.0

Specialties & Research

Dr. Mark O'Brien, DO is board certified in Family Medicine.

Education & Awards

Dr. O'Brien graduated from Des Moines University. He has 2 awards.

Patients' Choice Award (2014)
Compassionate Doctor Recognition (2014)


Dr. O'Brien has 1 hospital affiliations:

  • St. John River District Hospital 

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Additional Information
Dr. Mark Thomas O'Brien DO is a male Family Practitioner, has 25 years of experience and practices in Family Medicine.
Where does Dr. Mark T. O'Brien practice?
Dr. Mark O'Brien has 2 office locations.
Dr. Mark O'Brien practices Family Medicine near East China, MI.
Additional practice locations include: Algonac, MI.
See East China Primary Care Doctors.