1675 Shaffer Road. Atwater, CA 95301. Phone: (209) 383-5500. Fax: (209) 383-6910. Hours of Operation: Monday-Friday 8:00 a.m. - 5:00 p.m. MFA Castle is located next to Anberry Rehabilitation Hospital. This location offers several Primary Care Physicians who are available to help your manage your health and well-being the way you need..