Department of Medicine

The Scripps Clinic Medical Group Department of Medicine is composed of 17 distinct specialty-based divisions staffed by award-winning physicians who have been repeatedly recognized – locally, regionally, and nationally — for their exceptional performance. Our physician specialists staff multiple Scripps Clinic sites for outpatient care and multiple Scripps Health hospitals for inpatient care, providing patients with attentive, specialized care, from diagnostic evaluation to medical procedures. Our team of board-certified specialists are dedicated to elevating clinical care, clinical research, graduate medical education, and continuing medical education toward continued advances in their specialty fields.

Department Chair: John Rogers, MD

Department Vice Chair: Alvin Coda, MD

Department Advanced Practice Clinician Lead: Jonathan Jaseniuk, PA

Clinical Vice President, Medicine Services: Gary W. Williams, MD, PhD

Clinical Associate Vice President, Medicine Services: James Mason, MD

Division of Allergy, Asthma & Immunology Katherine Woessner, MD
Division of Cardiovascular Diseases Paul Teirstein, MD
Division of Chest & Critical Care Medicine Jacqueline Chang, MD
Division of Dermatology Arash Izadpanah, MD
Division of Diabetes/Endocrinology Amy Chang, MD
Division of Gastroenterology/Hepatology Walter Coyle, MD
Division of Geriatric Medicine Katrina DeLeon, MD
Division of Hematology/Oncology James Mason, MD

Darren Sigal, MD & Marin Xavier, MD, Co-Division Heads

Division of Hospital Medicine Liesbet Joris Quinton, MD

Farhad Shadan, MD, Co-Division Head

Division of Infectious Diseases Miguel Goicoechea, MD
Division of Integrative Medicine Christopher Suhar, MD
Division of Nephrology Andew King, MD
Division of Neurology Joshua Alexander, DO
Division of Radiation/Oncology Ray Lin, MD
Division of Rheumatology Peter Weis, MD
Division of Urgent Care/Scripps Clinic Rancho Bernardo Kimberly Longmire, MD
Division of Urgent Care/Scripps Clinic Torrey Pines Thomas Kozak, MD

Highlights, Research & Awards

  • Our teams serve multiple Scripps sites, including Scripps La Jolla Hospitals and Clinics, which have been ranked the #1 in San Diego and top 10 in California by US News & World Report.

  • Many of our specialties are ranked #1 in San Diego by US News & World Report, including Diabetes & Endocrinology, Gastroenterology & GI Surgery, Nephrology, and Cardiology & Heart Surgery. Our Geriatrics and Neurology/Neurosurgery programs are ranked #2 in San Diego.

  • Department members have been recognized, some repeatedly, for their medical excellence in local and national Best/Top Doctors listings, including:

    • Allergy and Immunology: John Kelso, MD; Ronald Simon, MD; and Katharine Woessner, MD
    • Cardiovascular Diseases: J. Thomas Heywood, MD; Paul Teirstein, MD, Division of Cardiovascular Diseases; and Eric Topol, MD
    • Chest Medicine & Critical Care: Jacqueline Chang, MD; Achal Dhupa, MD; and J. Steven Poceta, MD
    • Dermatology: Hubert Greenway, MD and Stacy Ostrow, MD
    • Diabetes & Endocrinology: George Dailey, MD and Ken Fujioka, MD, Division of Diabetes & Endocrinology
    • Gastroenterology: Walter Coyle, MD and Catherine Frenette, MD, Division of Gastroenterology
    • Hematology & Oncology: Marin Xavier, MD; Michael Kosty, MD; and Alan Saven, MD
    • Infectious Diseases: David Redfield, MD and Michael Preziosi, MD
    • Nephrology: Andrew King, MD and Emily Rubenstein, MD
    • Neurology: Melissa Houser, MD; Mary Kalafut, MD; and Charles Smith, MD
    • Radiation Oncology: Ray Lin, MD and Prabhakar Tripuraneni, MD
    • Rheumatology: Gary Williams, MD, PhD


Department of Medicine members perform clinical research and publish extensively. Please visit each Division page for more information about the breadth of research, past and present, conducted by its members. For a compilation of PUBMED listings from recent years for the Department, please visit the SCMG Research News & Publications page.


Department of Medicine members of SCMG serve as the faculty for our Internal Medicine Residency and 11 post-residency Fellowships in various medicine specialties, including:

  • Internal Medicine Residency
  • Allergy/Immunology Fellowship
  • Cardiovascular Diseases Fellowship
  • Heart Failure Fellowship
  • Interventional Cardiology Fellowship
  • Advanced Interventional Cardiology Fellowship in Structural & Peripheral Interventions
  • Advanced Cardiac Imaging Fellowship
  • Mohs Dermatologic Oncology Fellowship
  • Diabetes/Endocrinology Fellowship
  • Gastroenterology Fellowship
  • Hematology / Oncology Fellowship
  • Rheumatology Fellowship

A brief description and details of each training program are included in the respective specialty divisional webpage or, for more information, please visit the Graduate Medical Education page.