About
Dr. Ramón Diez-Barroso is a board-certified Family Medicine physician and the founder of Merlin Direct Primary Care in San Antonio. He earned his medical degree at Baylor College of Medicine and completed his Family Medicine residency there in Houston. During training he also completed a General Surgery internship, giving him a broad clinical foundation. His career path has included surgical training, private wealth management, real estate development, and healthcare entrepreneurship. Those experiences shaped his belief that great medical care must be efficient, thoughtful, and deeply human.
Dr. Diez-Barroso grew up in Laredo with roots spanning Mexico City to San Antonio. After finishing his residency, he and his wife returned to San Antonio to build a practice in the community they call home. He is passionate about chronic disease management, metabolic and weight health, preventive care, and mental health support. He also brings focused attention to women's health, men's health, pediatric care, and geriatric care. Bilingual in English and Spanish, he serves patients from all walks of life. Outside the clinic, he enjoys running, tennis, painting, playing guitar, and spending time with his growing family.
Education & Training
Medical School
Baylor College of Medicine
Residency
Family Medicine, Baylor College of Medicine, Houston; General Surgery internship
Certifications
Languages
English, Spanish
Conditions Treated
Who is Dr. Diez-Barroso right for?
Dr. Diez-Barroso is a strong fit for adults, children, and seniors who want a consistent, unhurried relationship with one physician. Patients managing chronic conditions such as diabetes, hypertension, high cholesterol, or obesity benefit from his focus on continuous monitoring and personalized treatment. He also serves patients navigating postpartum recovery, anxiety, and metabolic health concerns. Families looking for a bilingual physician who handles pediatric and adult care in one practice will find his scope especially practical. His direct availability by phone and text suits patients who value fast, personal access to their doctor.
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Frequently Asked Questions
Dr. Diez-Barroso treats a wide range of acute and chronic conditions. His clinical focus includes diabetes, hypertension, high cholesterol, obesity, fatty liver, hyperlipidemia, anxiety, postpartum complications, osteoporosis, arthritis, and dementia. He also handles urgent sick visits, dermatologic concerns, and vein health.
Yes. Dr. Diez-Barroso holds board certification in Family Medicine. He completed both his medical degree and his Family Medicine residency at Baylor College of Medicine in Houston. He also completed a General Surgery internship during his training.
Yes. Dr. Diez-Barroso cares for patients across the full age spectrum, from infants and children to adults and older adults. He offers dedicated pediatric care, geriatric care, and comprehensive family medicine for everyone in between.
Yes. Dr. Diez-Barroso is fully bilingual in English and Spanish. He grew up in Laredo with roots in Mexico City and San Antonio, and he welcomes patients from San Antonio's diverse communities in both languages.
Dr. Diez-Barroso focuses on early detection, continuous monitoring, and personalized treatment plans. He manages conditions like diabetes, hypertension, and high cholesterol in a single, ongoing relationship. His goal is to prevent serious complications before they develop, not simply respond to them after they appear.
Yes. Members reach Dr. Diez-Barroso directly by phone or text. He personally answers calls and follows up proactively with patients. This direct access is a core part of how he practices medicine at Merlin DPC.
Dr. Diez-Barroso has experience in surgical training, private wealth management, real estate development, and healthcare entrepreneurship. That diverse background informs his practical, patient-first approach to building and running a medical practice.
Yes. Dr. Diez-Barroso provides women's health services including Pap smears, colposcopy, postpartum care, and general preventive health for women. He also manages chronic conditions that disproportionately affect women, such as osteoporosis and thyroid-related issues.
Doctor profile last updated March 22, 2026