Wurzbach Clinic

Saturday Clinic

Hours: Monday- Friday 8A.M - 5P.M
Saturday 8A.M - 1:30P.M

8542 Wurzbach Rd. | San Antonio, TX 78240-1241
Telephone: 210-616-7300 | Fax: 210-616-7359

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.


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.


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.


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.



I love DR CALDERON, I FOLLOWED HER TO THIS CLINIC FROM THE LAST CLINIC SHE WAS AT. She spoke with me about my concerns, she checked my physical status and we spoke about my medication choices and behavioral choices.

Everyone in the office is always very helpful and courteous. Dr Kosmatka is an outstanding doctor. Thank you for taking care of my health.

Dr. Yu has an excellent approach with her patients. It is my belief that it stems from her years as a nurse, that helps her relate with her patients. I have been a patient of Dr. Yu for almost 20 years and I am always pleased with the care I receive.

Exceptional care always. very pleased with Dr Clark and staff.

Dr. Calderon is very helpful in providing me the information I need in my weight loss journey. She has given me guidance and I look forward to my follow ups with her.

Always very happy with my visit with Dr. K. he explains everything and provides me with choices.

All employees very caring & knowledgeable. *Dr. Yu is wonderful, patient, kind, caring endless love.

Always treated with respect and kindness, from the moment I walk in to the time I leave. Thanks Dr. Clark

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