Dr. Heidi Ulfeng Gassner, MD is a health care provider primarily located in Vallejo, CA, with other offices in Oakland, CA and Roseville, CA (and 2 other locations). She has 28 years of experience. Her specialties include Pediatric Endocrinology, Endocrinology, Diabetes & Metabolism, Pediatrics. Dr. Gassner is affiliated with Kaiser Permanente Vallejo Medical Center. She speaks English.