Browse Health
Internist, Cardiologist (heart)
36 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).

Learn more about Dr. Warren Johnston:

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  1. Qualifications
  2. What's important to you

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Patient Reviews

Patient comments (1)

The overall average patient rating of Dr. Warren Johnston is Excellent. Dr. Johnston has been reviewed by 4 patients who have provided 1 comments. The rating is 4.5 out of 5 stars.

Patient Ratings
Ease of Appointment 4.5
Promptness 5.0
Courteous Staff 5.0
Accurate Diagnosis 4.3
Bedside Manner 4.3
Spends Time with Me 4.1
Follows Up After Visit 5.0

Specialties & Research

Dr. Warren Johnston, FACC, FACP, MD is board certified in Internal Medicine and Cardiovascular Disease.

  • He has special expertise in 6 areas:
  • Acute Coronary Syndrome (ACS)
  • Heart Block
  • High Blood Pressure (Hypertension)
  • High Cholesterol (Hypercholesterolemia)
  • Unstable Angina
  • Women's Health

Education & Awards

Dr. Johnston graduated from University of Rochester .


Dr. Johnston has 8 hospital affiliations:

  • St. Joseph Hospital - Orange 
  • Irvine Regional Hospital & Medical Center 


  • Spanish
  • Farsi
  • Persian
  • Armenian

> > > > Dr. Warren Johnston, FACC, FACP, MD

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Additional Information
Dr. Warren David Johnston FACC, FACP, and MD is a male Internist, has 36 years of experience and practices in Internal Medicine and Cardiovascular Disease.
Where does Dr. Warren D. Johnston practice?
Dr. Warren Johnston has 4 office locations.
Dr. Warren Johnston practices Internal Medicine and Cardiovascular Disease near Santa Ana, CA.
Additional practice locations include: Newport Beach, CA and Orange, CA.
See Santa Ana Internists and Santa Ana Cardiologists.