The Annotation and Image Markup (AIM) Foundation information model is an evolution of AIM version 3 revision 11. It has evolved in response to the feedback and changing demands from the imaging community. Feedback was collected as part of the requirements for improving the foundation model. The model is described in a Unified Modeling Language (UML) class diagram and used as a base model for other imaging disciplines to extend information collection not currently captured in the Foundation model. The model captures imaging physical entities and their characteristics, imaging observation entities and their characteristics, markups (two- and three-dimensional), AIM statements, calculations, image source, inferences, annotation role, task context or workflow, audit trail, AIM creator, equipment used to create AIM instances, subject demographics, and adjudication observations.