Walk-in and Enroll at the Valley-Wide Sierra Blanca Medical Center in Alamosa! Certified Assisters are available to help you review health insurance options for 2020 and get enrolled! Dec 3rd and Dec 4th from 8:00 am – 12:00 pm and 1:00pm – 4:00 pm. Sierra Blanca Medical Center – 106 Blanca Avenue #300, Alamosa, CO 81101. Call Jeanette at 719-587-5933 for more information.