The UMLS Terminology Services (UTS)
provides both web interfaces as well as Web Services to search and retrieve Unified Medical Language System®
The Indexing Initiative utilizes the UTS authentication information to allow access to the various restricted areas of the Indexing Initiative web sites.
If you already have access to an UTS account, you can simply use that username and password to access the restricted areas of this site.
If you do not have a UTS account, you will need to set up an account. For instructions on requesting a license and accessing the UTS, see How to License and Access the Unified Medical Language System® (UMLS®) Data