Dr. Jill VilaythongM.D.
Internal Medicine
at Erin Reese MD — San Antonio, TX
About
Dr. Jill Vilaythong completed her Bachelor of Science in Biochemistry at the University of Texas at Austin before earning her medical degree at the University of Texas Southwestern Medical School in Dallas. She completed her internship and residency in internal medicine at the University of Texas Southwestern Medical Center, also in Dallas. It was during medical school that she discovered her passion for adult medicine and internal medicine.
Following residency, Dr. Vilaythong joined Texas Primary Care Associates as a hospitalist at Baylor University Medical Center in Dallas, a role she held for nearly five years. She and her husband later relocated to Oklahoma, where she spent three years caring for a rural community in Enid. There she also served as Medical Director for the Oklahoma Healthy Aging Initiative Northwest through the University of Oklahoma College of Medicine's Department of Geriatrics. She moved to San Antonio in 2018 and practiced at Northeast Internal Medical Associates and then San Antonio Medical Associates before joining the Erin Reese MD team. Her clinical background spans internal medicine and geriatric care. Patients consistently highlight her listening skills and collaborative approach to building a care plan. She grew up in Huntsville, Texas and now lives in San Antonio with her husband and son. She enjoys reading, cooking, and the arts.
Education & Training
Undergraduate
University of Texas at Austin, B.S. Biochemistry
Medical School
University of Texas Southwestern Medical School, Dallas, Texas
Residency
Internal Medicine, University of Texas Southwestern Medical Center, Dallas, Texas
Additional Training
Hospitalist at Baylor University Medical Center in Dallas (nearly 5 years); Medical Director for Oklahoma Healthy Aging Initiative Northwest, University of Oklahoma College of Medicine/Department of Geriatrics; practiced at Northeast Internal Medical Associates and San Antonio Medical Associates
Conditions Treated
Who is Dr. Vilaythong right for?
Dr. Vilaythong is a strong fit for adults managing ongoing chronic conditions or navigating the health challenges that come with aging. Her background as Medical Director for a geriatric health initiative makes her especially well-suited for older patients seeking thoughtful, relationship-driven primary care. Patients who value a physician who listens carefully and collaborates on treatment decisions will thrive under her care. She also serves patients with acute illnesses and those who want accessible, after-hours support from their personal physician.
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Frequently Asked Questions
Dr. Vilaythong specializes in internal medicine, primary care, and geriatric medicine. Her training and career have focused on adult patients, including older adults managing complex medical needs. She brings both hospitalist and rural community medicine experience to her practice in San Antonio.
Dr. Vilaythong completed her medical degree at the University of Texas Southwestern Medical School in Dallas. She then completed her internship and residency in internal medicine at the University of Texas Southwestern Medical Center, also in Dallas.
Yes, geriatric care is a core part of Dr. Vilaythong's clinical background. She served as Medical Director for the Oklahoma Healthy Aging Initiative Northwest through the University of Oklahoma College of Medicine's Department of Geriatrics. She continues to focus on older adult patients at Erin Reese MD.
Dr. Vilaythong takes a collaborative approach. She works directly with each patient to understand their individual health situation before building a tailored plan. Patients consistently describe her as an attentive listener who prioritizes their input throughout the process.
Yes. After completing her residency, Dr. Vilaythong joined Texas Primary Care Associates as a hospitalist at Baylor University Medical Center in Dallas. She held that role for nearly five years before transitioning to outpatient and community-based care.
Dr. Vilaythong sees adult patients at Erin Reese MD in San Antonio. Prospective patients can contact the practice directly to ask about availability and to learn more about becoming a member.
Dr. Vilaythong treats a broad range of adult medical conditions, including chronic illness management, diabetes, hypertension, and age-related health concerns. Her internal medicine and geriatric training equip her to manage both acute and long-term health needs.
Doctor profile last updated March 22, 2026