Stanley Andrew Tan, MD
Endocrinology, Diabetes & Metabolism
Also practices: INTERNAL MEDICINE
Stanley Andrew Tan, MD has practiced internal medicine for 55+ years, working in independent practice. Trained at Loma Linda University School of Medicine (class of 1971), he has been practicing for over 55 years. Endocrinologists treat hormonal and metabolic disorders including diabetes (type 1 and 2), thyroid disease, osteoporosis, and more.
Older · 210dNPPES updated 2025-10-08 · verify on CMS
$28 received from industry
1 transaction reported in 2018 ·Low 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 2018, attributed to Stanley Andrew Tan's NPI.
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Background & Specialty
Education, training, and specialty classification from CMS NPPES and Medicare records.
Graduated medical school · 1971
Loma Linda University School of Medicine
Board certified · Oct 7, 2025
CMS-verified certification date
55 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
Loma Linda University School of Medicine (Class of 1971)
Primary hospital affiliation: Acute Care Hospitals
CMS Certification Number: 520214
View hospital on Medicare Care CompareVirtual Endocrinology, Diabetes & Metabolism Care With Stanley Andrew Tan
NPPES records indicate this provider offers telehealth services. Contact the office to confirm availability and scheduling.
Schedule a virtual visit with Stanley Andrew Tan for follow-ups, medication reviews, and ongoing care — no travel to Castro Valley 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 Stanley Andrew Tan
Dr. Tan is listed as active in the NPI registry with telehealth listed in Castro Valley, CA. NPI status alone doesn't confirm open availability — call the office to confirm. Phone: (510) 785-5000.
Sourced from CMS NPPES · OIG LEIE · CMS Medicare Part D · CMS Open Payments 2018. See Data Methodology.
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Contact Stanley Andrew Tan
Practice Location
20642 John Dr, Castro Valley, CA 94546-5103
Mailing Address
20642 John Dr, Castro Valley, CA 94546-5103
This is a provider directory. Contact the office directly to schedule appointments.
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