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Language(s) Spoken

English; Spanish

Joined Kelsey-Seybold

December 1997

Accepting New Patients?


​​​​​​Profess​ional Background

Dr. Castillo graduated from Meharry Medical College in Nashville in 1981. He completed his residency at Oakwood Hospital in Dearborn, Michigan before completing a Master’s degree in Public Health and his residency in General Preventive Medicine at Loma Linda University in California. Dr. Castillo completed fellowship training in Occupational Medicine at West Virginia University, Morgantown.

Professional Organiz​ations

Dr. Castillo is a member of the American College of Occupational and Environmental Medicine, American College of Preventive Medicine, American College of Lifestyle Medicine, Harris County Medical Society and the Texas Medical Association.

Hobbies and Inte​​​rests

When he’s not caring for patients at Kelsey-Seybold Clinic, Dr. Castillo enjoys spending time with his wife and playing racquetball and baseball with his two sons.​​

​I would like every patient to have a positive, educational and motivational experience so that each person feels good about making positive lifestyle changes. Prevention and a healthy lifestyle are the two most important elements to health care.

Available Appointments with Xavier Castillo, MD



Family Medicine, Internal Medicine​, Pediatrics. Book online with ​AppointmentsNOW.

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Awards & Recognitions

​Appointments and Ce​​rtifications

Dr. Castillo is a senior medical examiner for the Federal Aviation Administration (FAA) and is credentialed to examine and certify pilots of all classes (private through airline transport). He’s also certified as a medical review officer. 

In addition, Dr. Castillo has been certified by the United Kingdom Offshore Operators Association and is a certified Oil & Gas UK (OGUK) medical examiner.
He is also certified by the Association of Diving Contractors International and is a U.S. Department of Transportation (DOT) certified medical examiner for the Federal Motor Carrier Safety Administration (FMCSA).