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Wurzbach Clinic



Ana Maria Calderon, M.D.

Doctor Calderon was born and raised in Bogota, Colombia. Upon graduating from the nation’s prestigious Universidad El Bosque with her medical degree, she continued her Internal Medicine training at New York Downtown Hospital, an affiliate of Weill Medical College of Cornell University, in New York City.

Kristi Clark, M.D.

Dr. Clark was born and raised in San Antonio, Texas and earned her Doctor of Medicine from Texas Tech University School of Medicine in Lubbock, Texas. She completed her Internal Medicine Internship and Residency training at the University of Texas Health Science Center at San Antonio.

Timothy Kosmatka, M.D.

After retiring from the United States Air Force as a Lieutenant Colonel and medical director of the Family Medicine Clinic at Randolph AFB, Dr. Tim Kosmatka brought his wealth of knowledge and expertise to HealthTexas Medical Group.He was born and raised in Sussex, Wisconsin where he enjoyed the outdoors as well as participated in multiple sporting activities.

James Walter, M.D.

Dr. James Walter was born and raised in a small town Azle, outside of Fort Worth, TX. His education and training took him across TX to Abilene, San Antonio and Amarillo. His love of education, health, and science were seeded at an early age by his Mother, who was also a physician and his father, who was a professor and museum director.

Stella Yu, M.D.

Dr. Stella Yu began her career in health care as a registered nurse at St. Joseph Hospital in Houston. While working as a nurse for five years she decided to further her education. She received her Doctor of Medicine degree from the University of the Visayas Gullas College of Medicine, graduating Cum Laude. Dr. Yu completed her residency at the Scranton Temple Residency Program in Pennsylvania.

Stephanie Garza, FNP-C

Ms. Stephanie Garza was born and raised in Laredo, Texas. She then moved to San Antonio in 2007. Ms. Garza comes from a family of health professionals.

I am very proud pleased with Dr. Santoscoy I left my old provider because I couldn't get appointments to get in but I've never had that problem here.

Larry S.