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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- Currently 4 of 4 stars
The overall average patient rating of Dr. Warren Johnston is Excellent.
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Specialties & Research
Dr. Warren Johnston, MD, FACC, FACP is board certified in Internal Medicine and Cardiovascular Disease.
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Education & Awards
Dr. Johnston graduated from University of Rochester .More Education & Awards
Dr. Johnston has 8 hospital affiliations:
- St. Joseph Hospital - Orange
- Irvine Regional Hospital & Medical Center
Accepted Insurance Plans
Dr. Johnston accepts these health insurances in at least one office:
- United Healthcare - 2 plans
- Blue Shield of California - 2 plans
- Unicare - 11 plans
- CaIOPTIMA - 2 plans
- Anthem Blue Cross - 3 plans
- Humana - 2 plans
- Cigna - 4 plans
- Aetna - 3 plans
- Great-West Healthcare - 2 plans
- USA H & W Network - 1 plan
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- Additional Information
- Where does Dr. Warren D. Johnston practice?
Dr. Warren Johnston practices Internal Medicine, Geriatric Medicine, Cardiovascular Disease, Cardiology, and General Practice near Orange, CA.
Additional practice locations include: Santa Ana, CA and Irvine, CA.
See Orange Internists, Orange Geriatric Doctors, Orange Cardiologists, and Orange General Practitioners.