Browse Health
Internist, Cardiologist (heart)
41 years of experience
Accepting new patients
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).

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Specialties & Research

Dr. Charles O'Brien, MD is board certified in Internal Medicine and Cardiovascular Disease.

  • He has special expertise in 6 areas:
  • Acute Coronary Syndrome (ACS)
  • Antisocial Personality Disorder
  • Heart Block
  • High Blood Pressure (Hypertension)
  • High Cholesterol (Hypercholesterolemia)
  • Unstable Angina

Education & Awards

Dr. O'Brien graduated from Creighton University, Omaha.


Dr. O'Brien has 3 hospital affiliations:

  • Avera Mckennan Hospital & University Health Center 
  • Sanford USD Medical Center 
  • Spencer Municipal Hospital 

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Additional Information
Dr. Charles Patrick O'Brien MD is a male Internist, has 41 years of experience and practices in Internal Medicine and Cardiovascular Disease.
Where does Dr. Charles P. O'Brien practice?
Dr. Charles O'Brien has 1 office location.
Dr. Charles O'Brien practices Internal Medicine and Cardiovascular Disease near Sioux Falls, SD.
See Sioux Falls Internists and Sioux Falls Cardiologists.