This code system http://hl7.org/fhir/v2/0717 defines the following codes:

CodeDisplay
ALLAll
DEMAll demographic data
DRGDrug
HIVHIV status and results
LOCPatient Location
NONone
OIOpt in all registries (HIPAA)
OOOpt out all registries (HIPAA)
PID-17Religion
PID-7Date of Birth
PSYPsychiatric Mental health
SMDSensitive medical data
STDSexually transmitted diseases