About
Dr. Jose V. Castellanos earned his medical degree from Ross University School of Medicine in 1981, also attending Universidad Nacional Pedro Henríquez Ureña. He completed both his internal medicine residency and a Nephrology fellowship at Our Lady of Mercy Medical Center in the Bronx, New York. That dual training gives him a strong foundation in complex chronic disease and kidney health. He holds board certification in internal medicine.
Early in his career, Dr. Castellanos served as an instructor at The Albert Einstein College of Medicine. He also held the role of Medical Director at Montefiore Medical Group before relocating to Florida. He has practiced in Boca Raton since 1998 and currently serves as a Clinical Affiliate Assistant Professor at Florida Atlantic University. Patients have called him thorough, compassionate, and consistently present, including at the hospital before 7 AM when needed. He sees adult and adolescent patients over 18 and conducts care in both English and Spanish.
Education & Training
Undergraduate
Universidad Nacional Pedro Henríquez Ureña
Medical School
Ross University School of Medicine (1981)
Residency
Internal Medicine Residency, Our Lady of Mercy Medical Center, Bronx, NY
Fellowship
Nephrology Fellowship, Our Lady of Mercy Medical Center, Bronx, NY
Additional Training
Clinical Affiliate Assistant Professor, Florida Atlantic University; Former Instructor, Albert Einstein College of Medicine; Former Medical Director, Montefiore Medical Group
Certifications
Conditions Treated
Who is Dr. Castellanos right for?
Dr. Castellanos is a strong fit for adults over 18 managing complex or chronic conditions. Patients dealing with diabetes, heart disease, high blood pressure, or kidney-related concerns benefit from his dual training in internal medicine and nephrology. He works well with patients who value around-the-clock physician access and unhurried appointments. Spanish-speaking patients will find him fully fluent and comfortable conducting care in their language.
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Frequently Asked Questions
Dr. Castellanos specializes in internal medicine with added training in nephrology. He treats diabetes, heart disease, high blood pressure, high cholesterol, lung disease, and sleep disorders. His nephrology background also makes him well-suited to manage patients with kidney-related concerns alongside other chronic conditions.
Dr. Castellanos has practiced in Boca Raton since 1998. Before relocating to Florida, he held roles at The Albert Einstein College of Medicine and served as Medical Director at Montefiore Medical Group in New York.
Yes, Dr. Castellanos holds board certification in internal medicine. He earned his medical degree in 1981 and completed both an internal medicine residency and a nephrology fellowship at Our Lady of Mercy Medical Center in the Bronx, New York.
Yes, Dr. Castellanos conducts care in both English and Spanish. This allows him to serve a broader range of patients in the Boca Raton community.
Dr. Castellanos sees adult patients and adolescents over the age of 18. His practice focuses on adult internal medicine, chronic disease management, and preventive care.
Yes, Dr. Castellanos stays reachable by phone, text, or email around the clock. Members can contact him directly for urgent questions or concerns at any hour.
Yes, Dr. Castellanos coordinates specialist referrals and hospital care for his members. Patients describe him as consistently present, including at the hospital before 7 AM when needed.
Dr. Castellanos served as an instructor at The Albert Einstein College of Medicine early in his career. He currently holds the position of Clinical Affiliate Assistant Professor at Florida Atlantic University.
Doctor profile last updated March 21, 2026