Pasteur Medical Associates has been San Antonio's trusted destination for comprehensive internal medicine and concierge-level primary care since 1993. Founded by Dr. Bradley Kayser and now home to seven board-certified Internal Medicine physicians, the practice combines traditional insurance-based care with an optional concierge membership that offers dramatically reduced patient panels, same-day or next-day access, and extended, unrushed appointments. Located at 4410 Medical Dr, Suite 100, San Antonio, TX 78229, Pasteur brings an unusually broad range of in-house diagnostic capabilities under one roof — meaning fewer referrals, faster answers, and genuinely coordinated care. As an independently owned practice, Pasteur remains focused on its founding mission: comprehensive, coordinated care that treats every patient as a whole person, not a set of isolated complaints.

About the Practice

Over three decades of growth, Pasteur Medical Associates has expanded from a single-physician practice into a seven-doctor team — while staying true to its roots as an independently owned, physician-led organization. The team includes Dr. Bradley Kayser, Dr. Michelle Scanlan, Dr. John Galan, Dr. Douglas R. Hilbert (FACP), Dr. Timothy A. Hernandez, Dr. Jessica Dunn, and Dr. Juan S. Pico (DO). Every physician is board-certified in Internal Medicine; patients always see a doctor, never a midlevel provider. The concierge medicine model keeps patient panels 90% smaller than traditional primary care — typically 300–800 patients per physician — ensuring each patient receives unhurried, personalized attention. With specialists coordinated through a primary care home base, Pasteur eliminates the fragmentation that plagues conventional medicine and gives patients one trusted team who sees the complete picture.

Services Offered

• Concierge Medicine Membership — reduced panel sizes, same/next-day access, and direct physician communication by phone or secure message.
• Preventive Health & Chronic Disease Management — hypertension, diabetes, heart disease, arthritis, and complex medical conditions managed by board-certified internists.
• DEXA Body Composition & Bone Density Scan — GE Lunar Prodigy Advance with Trabecular Bone Score (TBS) for precise osteoporosis risk and visceral fat assessment.
• In-House COLA/CLIA Accredited Laboratory — on-site testing for rapid results and continuity of care; COLA Laboratory Excellence Award recipient since 1992.
• In-House Digital X-Ray — real-time imaging reviewed by a radiologist for prompt diagnosis and treatment planning.
• Cardiovascular Screening — carotid intimal media artery thickness testing for early detection of cardiovascular disease risk.
• Telemedicine & Virtual Appointments — convenient remote access to your board-certified physician from home or office.
• Specialty Care Coordination — seamless referral and specialist communication to keep care unified and comprehensive.

What to Expect

New patients choose between traditional insurance-based care and the optional concierge membership, which adds an annual extended service fee with monthly arrangements available. Concierge members enjoy same-day access, direct physician contact, and extended unrushed visits. Insurance covers office visits, labs, imaging, and specialist referrals; the concierge fee is HSA/FSA-eligible. To schedule, call (210) 614-4000 or visit pasteurdocs.com. Office hours are Monday–Thursday 8:00 AM–5:00 PM and Friday 8:00 AM–Noon.