| 5.1 | Support for Code Systems and Code System versions |
| 5.2 | Support for Concept Domains and Concept Domain Binding |
| 5.3 | Support for Value Sets and Value Set versions |
| 5.4 | Support for Value Set expansion |
| 5.5 | Support for Concept or Code lookup |
| 5.6 | Support for Translations between Code Systems or Value Sets |
| 5.7 | Support for Search/Query of Codes, Concepts, Value Sets based on metadata |
| 5.8 | Administrative functions for creating maps |
| 5.9 | Administrative functions for import/export of code systems, value sets, concept domains |
| 5.10 | Conformance with CTS-2 |