This case-sensitive code system http://hl7.org/fhir/consentperformer defines the following codes:
Code
Display
Definition
consenter
Consenter
An entity or an entity's delegatee who is the grantee in an agreement such as a consent for services, advanced directive, or a privacy consent directive in accordance with jurisdictional, organizational, or patient policy.
grantee
Grantee
An entity which accepts certain rights or authority from a grantor.
grantor
Grantor
An entity which agrees to confer certain rights or authority to a grantee.
delegatee
Delegatee
A party to whom some right or authority is granted by a delegator.
delegator
Delegator
A party that grants all or some portion its right or authority to another party.