John Gilbert, M.D.
Endocrinology, Diabetes & Metabolism
John Gilbert is an Endocrinology, Diabetes & Metabolism specialist based in Fullerton, CA with over 43 years of clinical experience. Medicare-enrolled per CMS records and offers virtual telehealth visits.
Also practices: INTERNAL MEDICINE
Patients across CA can see John Gilbert, M.D. in person in Fullerton or via virtual visit — no travel required. He graduated from State University of New York Downstate Medical Center in 1983 and has 43+ years of clinical experience. He regularly sees Medicare patients with hypertension, high cholesterol, and diabetes (per CMS claims data).
Older · 2043dNPPES updated 2020-10-19 · verify NPI on CMS · Verify license at Medical Board of California
Contact & Location
Practice Location
100 E Valencia Mesa Dr Suite 105, Fullerton, CA 92835
How Does This Doctor Compare?
Generic Rx
↑ Higher = better69.3%
California avg: 83.3 · US avg: 82.8
⚠ Lower than most doctors nationally(-13.5 pts)
How often this doctor prescribes affordable generic drugs instead of expensive brand-name ones.
Medicare Patients
601
Unique beneficiaries
High volumePrescription Recipients
1,067
Patients prescribed
Prescriptions Written
11,591
Total claims
Total Medicare drug cost: $3.91M
Percentile rankings compared against 9,360 reporting peers in California.
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 Diabetes.
High blood pressure — a leading risk factor for heart disease and stroke
US avg: 70.2%↑ More patients than average (+5%) — a focus area for this doctor
Elevated cholesterol or triglycerides that increase heart disease risk
US avg: 70.4%↑ More patients than average (+5%) — a focus area for this doctor
A condition where the body cannot properly regulate blood sugar levels
US avg: 34.5%↑ More patients than average (+20%) — a focus area for this doctor
Joint inflammation causing pain, swelling, and stiffness
US avg: 49.3%↓ Fewer patients than average (-1%) — less common here
Gradual loss of kidney function over time, often linked to diabetes or hypertension
US avg: 29.6%↑ More patients than average (+9%) — a focus area for this doctor
Weakened bones that are more prone to fractures, common in older adults
US avg: 18.1%↑ More patients than average (+18%) — a focus area for this doctor
Reduced blood flow to the heart muscle, commonly known as coronary artery disease
US avg: 31.7%↓ Fewer patients than average (-6%) — less common here
Percentage of this provider's Medicare patients diagnosed with each condition. Source: CMS Utilization Data.
$38.7k received from industry
113 transactions reported in 2024 ·Very High 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 John Gilbert's NPI.
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Background & Specialty
Education, training, and specialty classification from CMS NPPES and Medicare records.
Graduated medical school · 1983
Suny Downstate Health Sciences University
Board certified · Oct 18, 2020
Self-reported via NPPES
43 years in practice
Senior practitioner
Endocrinologists treat hormonal and metabolic disorders including diabetes (type 1 and 2), thyroid disease, osteoporosis, adrenal disorders, pituitary conditions, and polycystic ovary syndrome (PCOS).
Taxonomy: 207RE0101X
Education & Training
State University of New York Downstate Medical Center (Class of 1983)
Mailing address
100 E Valencia Mesa Dr Ste 105, Fullerton, CA 92835-3816
Differs from practice location
Primary hospital affiliation: Acute Care Hospitals
CMS Certification Number: 190319
View hospital on Medicare Care CompareVirtual Endocrinology, Diabetes & Metabolism Care With John Gilbert
NPPES records indicate this provider offers telehealth services. Contact the office to confirm availability and scheduling.
Schedule a virtual visit with John Gilbert for blood pressure monitoring, cholesterol management, diabetes check-ins — no travel to Fullerton 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 John Gilbert
Dr. Gilbert is listed as active in the NPI registry with telehealth listed in Fullerton, CA. NPI status alone doesn't confirm open availability — call the office to confirm. Phone: (714) 446-5640.
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 John Gilbert
Practice Location
100 E Valencia Mesa Dr Suite 105, Fullerton, CA 92835
Mailing Address
100 E Valencia Mesa Dr Ste 105, Fullerton, CA 92835-3816
This is a provider directory. Contact the office directly to schedule appointments.
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