Epocrates, Inc. is an American company based in San Francisco, California that makes various mobile health software applications under the "epocrates" name, mostly for health care providers, providing them reference information about drugs and diseases, and diagnostic tools. Epocrates is a publisher of mobile device software applications, designed to provide information about drugs to doctors and other health care professionals. Among the software functions is checking for drug interactions, news feeds for product announcements and medical news, journal article lookup, as well as a mobile guide to ICD-9 and Current Procedural Terminology ("CPT") diagnosis codes. The application is widely available and sometimes free. One can download the application easily to an iPhone or Android device, so it is easily accessible. The company markets both free and multiple paid versions. It receives additional revenue from pharmaceutical companies.