This case-sensitive code system http://hl7.org/fhir/medicationdispense-admin-location defines the following codes:
Code
Display
Definition
inpatient
Inpatient
Includes dispenses for medications to be administered or consumed in an inpatient or acute care setting.
outpatient
Outpatient
Includes dispenses for medications to be administered or consumed in an outpatient setting (for example, Emergency Department, Outpatient Clinic, Outpatient Surgery, Doctor's office).
community
Community
Includes dispenses for medications to be administered or consumed by the patient in their home (this would include long term care or nursing homes, hospices, etc.).