Warren David Johnston, MD
Cardiovascular Disease Internal Medicine
Warren David Johnston is a Cardiovascular Disease Internal Medicine specialist based in Orange, CA with over 51 years of clinical experience. Medicare-enrolled per CMS records and offers virtual telehealth visits.
With over 51 years in internal medicine, Warren David Johnston, MD is a long-established cardiologist in Orange. He graduated from University of Rochester School of Medicine and Dentistry in 1975 and has 51+ years of clinical experience. Among his Medicare patients, common conditions include hypertension, high cholesterol, and ischemic_heart (per CMS data).
Older · 1663dNPPES updated 2021-11-03 · verify NPI on CMS · Verify license at Medical Board of California
Contact & Location
Practice Location
1140 W La Veta Ave Ste 430, Orange, CA 92868-4226
How Does This Doctor Compare?
Medicare Patients
497
Unique beneficiaries
Standard volumePrescription Recipients
825
Patients prescribed
Prescriptions Written
5,103
Total claims
Total Medicare drug cost: $924k
Data Note: Sourced from CMS Medicare Provider Utilization & Payment Data. Percentile rankings compare this provider against all peers with reported data in the same state. Updated annually to reflect the latest federal reporting cycle.
What This Doctor Treats Most
Based on Medicare claims data — here's what patients commonly see this doctor for
Based on Medicare data, this doctor primarily manages Hypertension, High Cholesterol, and Ischemic Heart Disease.
High blood pressure — a leading risk factor for heart disease and stroke
Elevated cholesterol or triglycerides that increase heart disease risk
Reduced blood flow to the heart muscle, commonly known as coronary artery disease
Joint inflammation causing pain, swelling, and stiffness
Gradual loss of kidney function over time, often linked to diabetes or hypertension
A condition where the body cannot properly regulate blood sugar levels
An irregular, often rapid heartbeat that increases the risk of stroke
The heart cannot pump blood efficiently enough to meet the body's needs
Percentage of this provider's Medicare patients diagnosed with each condition. Source: CMS Utilization Data.
$542 received from industry
39 transactions reported in 2024 ·Moderate tier
Payments include consulting fees, speaking honoraria, food & beverage, travel, research support, and ownership interests from drug and medical device manufacturers. Disclosure is required by the federal Physician Payments Sunshine Act. These payments do not necessarily indicate conflicts of interest. National median: $338 across 136 000 tracked providers.
Tiers — Low: under $500 · Moderate: $500-5 000 · High: $5 000-25 000 · Very High: $25 000+. Source: CMS Open Payments 2024, attributed to Warren David Johnston's NPI.
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Background & Specialty
Education, training, and specialty classification from CMS NPPES and Medicare records.
Graduated medical school · 1975
University of Rochester School of Medicine and Dentistry
Board certified · Nov 2, 2021
Self-reported via NPPES
51 years in practice
Senior practitioner
Cardiologists specialize in diagnosing and treating heart and blood vessel conditions including coronary artery disease, heart failure, arrhythmias, valve disorders, and hypertension. They perform diagnostic procedures such as echocardiograms, stress tests, and cardiac catheterization.
Taxonomy: 207RC0000X
Education & Training
University of Rochester School of Medicine and Dentistry (Class of 1975)
Primary hospital affiliation: Acute Care Hospitals
CMS Certification Number: 190053
View hospital on Medicare Care CompareVirtual Cardiovascular Disease Care With Warren David Johnston
NPPES records indicate this provider offers telehealth services. Contact the office to confirm availability and scheduling.
Schedule a virtual visit with Warren David Johnston for blood pressure monitoring, cholesterol management, follow-up consultations — no travel to Orange required. The office sends a secure video link before your appointment. Most visits take 15–30 minutes. Medicare enrolled per CMS records.
Frequently Asked Questions
Common questions about Warren David Johnston
NPI records show Dr. Johnston as active with telehealth listed in Orange, CA. NPI status alone doesn't confirm open availability — call the office to confirm. Phone: (714) 543-5555.
Sourced from CMS NPPES · OIG LEIE · CMS Medicare Part D · CMS Open Payments 2024 · CMS Physician Comparator. See Data Methodology.
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Contact Warren David Johnston
Practice Location
1140 W La Veta Ave Ste 430, Orange, CA 92868-4226
Mailing Address
1140 W La Veta Ave Ste 430, Orange, CA 92868-4226
This is a provider directory. Contact the office directly to schedule appointments.
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