Dignity Health - Mark Twain Medical Center is a hospital that offers many services, including diagnostic imaging services, emergency services, and heart care. Visit Dignity Health - Mark Twain Medical Center located at 768 Mountain Ranch Rd, San Andreas, CA. This San Andreas hospital is one of the best in California. As part of the Dignity Health network, Dignity Health - Mark Twain Medical Center is dedicated to delivering high quality, compassionate care and access to San Andreas and nearby communities.