Thomas G. Diaz, MD

Thomas G. Diaz, MD

Family Medicine
Thomas G. Diaz, MD

Thomas G. Diaz, MD

Family Medicine

Personal Statement

Dr. Thomas Diaz has 27 years of clinical practice experience as a family doctor. He is a graduate of the Universidad Autonoma de Guadalajara, Mexico. He completed a rotating internship at Mount Sinai Medical Center in Chicago Illinois and completed two years of psychiatry training at Los Angeles County USC Medical Center.

His desire to become a family doctor led him to enroll in the St. Francis Regional Medical Center in Wichita Kansas where he completed residency training in the specialty of Family Medicine. He went into private practice for two years at the Wysong Medical Clinic in McKinney Texas.

From 1986 to 1995 he served as a staff physician for Family Health Plan a staff model health maintenance organization located in Milwaukee Wisconsin. He moved to the Houston area in 1995 where he has been serving the Katy community and surrounding areas. He has held staff privileges at the Memorial City and Katy Hospitals and was the chairman of the Katy Memorial Hospital Family Practice Department.

He has been continually Board Certified in Family Medicine since 1983. He is a member of the Harris County Medical Society and the Texas Board of Family Physicians.




  • English
  • Spanish

Insurance Plans

  • Aetna - HMO
  • Aetna - POS
  • Aetna - PPO
  • Aetna Whole Health
  • BC/BS - PPO
  • BC/BS Medicare
  • BeechStreet - PPO
  • Bravo
  • Cigna - HMO
  • Cigna - PPO
  • Great West Healthcare - HMO
  • Great West Healthcare - Open Access
  • Great West Healthcare - POS
  • GWH-Cigna Open Access Plus
  • Humana - Medicare Replacement HMO
  • Humana - Medicare Replacement PPO
  • Medicare - Regular
  • Memorial Hermann Choice - MH Choice
  • Memorial Hermann Elect - MH Elect
  • Memorial Hermann Employees - MH Employees
  • Memorial Hermann Select - MH Select
  • MHealth - Insurance Plans
  • PHCS - HMO
  • PHCS - PPO
  • Railroad Medicare
  • Self Pay (No Insurance)
  • UMR - Insurance Plans
  • Unicare - PPO
  • United Healthcare - HMO
  • United Healthcare - PPO

Medical School

Universidad Autonoma de Guadalajar-Dean of Foreign Students (1978)


University Of Southern California at Los Angeles (1980)

Board Certifications

  • Family Medicine

Research Interests

  • Attention Deficit Disorder, Diabetes, Flexible Sigmoidoscopy, Flight Physicals FAA, Geriatrics, Hypertension, Menopause, No scalpel vasectomy, Nutrition & Weight Control, Varicose Vein Sclerotherapy

Available Appointments

Premier Internal Medicine Associates Of Houston

Katy Medical Arts Center 1331 W Grand Parkway N. Suite 345 Katy, TX 77493 (281) 398-8044

Mar 09
Mar 10
Mar 11
Mar 12
Mar 13
Please call (281) 398-8044