Clinically there are 4 categories of diabetes mellitus (DM) – type 1 diabetes, type 2 diabetes, gestational diabetes mellitus, and cause-specific diabetes related to specific causes (e.g. cystic fibrosis, pancreatic disease, or drug-induced). The latest estimates from the Centers for Disease Control (CDC) note that 29 million people (9.3% of the U.S. population) have diabetes. This online module reviews the standards of treatment for older patients with diabetes.