This code system http://hl7.org/fhir/contract-action defines the following codes:

Code Display Definition
action-a Action A Definition for Action A
action-b Action B Definition for Action B
<status value="draft"/> <experimental value="false"/> <description value="This value set includes sample Contract Action codes."/> <copyright value="This is an example set."/> <caseSensitive value="true"/> <content value="complete"/> <concept> <code value="action-a"/> <display value="Action A"/> <definition value="Definition for Action A"/> </concept> <concept> <code value="action-b"/> <display value="Action B"/> <definition value="Definition for Action B"/> </concept> </CodeSystem>