This code system http://hl7.org/fhir/usage-context-type defines the following codes:

CodeDisplayDefinition
genderGenderThe gender of the patient. For this context type, the value should be a code taken from the http://hl7.org/fhir/ValueSet/administrative-gender value set
ageAge RangeThe age of the patient. For this context type, the value should be a range the specifies the applicable ages or a code from the MeSH value set http://hl7.org/fhir/ValueSet/v3-AgeGroupObservationValue
focusClinical FocusThe clinical concept(s) addressed by the artifact. For example, disease, diagnostic test interpretation, medication ordering as in http://hl7.org/fhir/ValueSet/condition-code.
userUser TypeThe clinical specialty of the context in which the patient is being treated - For example, PCP, Patient, Cardiologist, Behavioral Professional, Oral Health Professional, Prescriber, etc... taken from the NUCC Health Care provider taxonomy value set http://hl7.org/fhir/ValueSet/provider-taxonomy.
workflowWorkflow SettingThe settings in which the artifact is intended for use. For example, admission, pre-op, etc. For example, the ActEncounterCode value set http://hl7.org/fhir/ValueSet/v3-ActEncounterCode
taskWorkflow TaskThe context for the clinical task(s) represented by this artifact. Can be any task context represented by the HL7 ActTaskCode value set http://hl7.org/fhir/ValueSet/v3-ActTaskCode. General categories include: order entry, patient documentation and patient information review.
venueClinical VenueThe venue in which an artifact could be used. For example, Outpatient, Inpatient, Home, Nursing home. The code value may originate from either the HL7 ActEncounterCode http://hl7.org/fhir/ValueSet/v3-ActEncounterCode or NUCC non-individual provider codes http://hl7.org/fhir/ValueSet/provider-taxonomy
speciesSpeciesThe species to which an artifact applies. For example, SNOMED - 387961004 | Kingdom Animalia (organism).