Dr. Charles Alman Duncan, MD

Dr. Charles Duncan specializes in pulmonology and critical care medicine, bringing nearly five decades of medical expertise to his practice. He earned his medical degree from the Medical College of Georgia at Augusta University and has dedicated 49 years to treating patients with complex respiratory and critical care conditions. Dr. Duncan is fluent in both English and Spanish.

Dr. Duncan maintains hospital affiliations with Kindred Hospital San Antonio, Methodist Ambulatory Surgery Hospital, Methodist Texsan Hospital, and Foundation Surgical Hospital of San Antonio, with practice locations in San Antonio, Texas. He focuses on treating obstructive sleep apnea and sleep disorders in both adults and children. His expertise includes performing pulmonary function testing and bronchodilator reversibility testing to assess lung health. Patients have given Dr. Duncan an average rating of 4.2 out of 5.