The typical way to find out a patient's hospital room number is to call the hospital or ask at the hospital's reception desk. Hospitals typically release this information unless the patient has requested them not to do so.
Under the Health Insurance Portability and Accountability Act Privacy Rule, hospitals are allowed to give out patient room information unless the patient has specifically asked for this information to be kept private. In addition, hospitals are allowed to establish opt-in policies in which they do not provide patient information to anyone unless the patient has expressly granted her permission. Hospitals must inform patients of the types of information included in a patient directory and must provide the opportunity to opt-out or opt-in to the directory, depending on the hospital's policies.