Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

Warren David Johnston, MD

Individual provider Cardiovascular Disease Physician · NPI 1427052802

Warren David Johnston, MD is a Cardiovascular Disease (Cardiology) in Orange, California. Graduated from University of Rochester School of Medicine and Dentistry in 1975, 51 years ago. Practices with Providence Medical Foundation, a 1,465-clinician group, accepts Medicare assignment and offers telehealth. Licensed in California.

Years since qualifying
51
Trained at
University of Rochester School of Medicine and Dentistry
Licensed in
CA
In the registry since
2005
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

See every abbreviation used in this directory →

Practice location Address checks out

1140 W La Veta Ave Ste 430
Orange, CA 92868-4226
Phone: (714) 543-5555
Fax: (714) 836-2427
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Cardiovascular Disease Physician (primary) Taxonomy 207RC0000X · Licence G33255 (CA)

Record details

NPI number1427052802
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJune 13, 2005
Last updated in NPPESNovember 3, 2021
Certification dateNovember 3, 2021
Mailing address1140 W La Veta Ave Ste 430, Orange, CA 92868-4226

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyCARDIOVASCULAR DISEASE (CARDIOLOGY)
Medical schoolUNIVERSITY OF ROCHESTER SCHOOL OF MEDICINE AND DENTISTRY
Graduated 1975 (51 years in practice)
Group practice Providence Medical Foundation — 1465 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services
Practice locations5 on file with Medicare

Other providers in Orange