The objective of this study was to evaluate the satisfaction with, and the feasibility and effectiveness of, a public health detailing project focused on increasing routine human immunodeficiency virus (HIV) screening of people aged 13-64 by primary care providers working in areas of Baltimore City, Maryland, with high rates of HIV transmission (defined as a mean geometric viral load of 1500 copies/mL per census tract). In public health detailing, trained public health professionals (ie, detailers) visit medical practice sites to meet with providers and site staff members, with the intention of influencing changes in clinical practice policy and/or behavior.