This code system http://terminology.hl7.org/CodeSystem/hl7-work-group defines the following codes:

CodeDisplayDefinition
cbcc Community Based Collaborative CareCommunity Based Collaborative Care (http://www.hl7.org/Special/committees/cbcc/index.cfm).
cds Clinical Decision SupportClinical Decision Support (http://www.hl7.org/Special/committees/dss/index.cfm).
cqi Clinical Quality InformationClinical Quality Information (http://www.hl7.org/Special/committees/cqi/index.cfm).
cg Clinical GenomicsClinical Genomics (http://www.hl7.org/Special/committees/clingenomics/index.cfm).
dev Health Care DevicesHealth Care Devices (http://www.hl7.org/Special/committees/healthcaredevices/index.cfm).
ehr Electronic Health RecordsElectronic Health Records (http://www.hl7.org/special/committees/ehr/index.cfm).
fhir FHIR InfrastructureFHIR Infrastructure (http://www.hl7.org/Special/committees/fiwg/index.cfm).
fm Financial ManagementFinancial Management (http://www.hl7.org/Special/committees/fm/index.cfm).
hsi Health Standards IntegrationHealth Standards Integration (http://www.hl7.org/Special/committees/hsi/index.cfm).
ii Imaging IntegrationImaging Integration (http://www.hl7.org/Special/committees/imagemgt/index.cfm).
inm Infrastructure And MessagingInfrastructure And Messaging (http://www.hl7.org/special/committees/inm/index.cfm).
its Implementable Technology SpecificationsImplementable Technology Specifications (http://www.hl7.org/special/committees/xml/index.cfm).
mnm Modeling and MethodologyModeling and Methodology (http://www.hl7.org/Special/committees/mnm/index.cfm).
oo Orders and ObservationsOrders and Observations (http://www.hl7.org/Special/committees/orders/index.cfm).
pa Patient AdministrationPatient Administration (http://www.hl7.org/Special/committees/pafm/index.cfm).
pc Patient CarePatient Care (http://www.hl7.org/Special/committees/patientcare/index.cfm).
pher Public Health and Emergency ResponsePublic Health and Emergency Response (http://www.hl7.org/Special/committees/pher/index.cfm).
phx PharmacyPharmacy (http://www.hl7.org/Special/committees/medication/index.cfm).
brr Biomedical Research and RegulationBiomedical Research and Regulation (http://www.hl7.org/Special/committees/rcrim/index.cfm).
sd Structured DocumentsStructured Documents (http://www.hl7.org/Special/committees/structure/index.cfm).
sec SecuritySecurity (http://www.hl7.org/Special/committees/secure/index.cfm).
us US Realm TaskforceUS Realm Taskforce (http://www.hl7.org/Special/committees/usrealm/index.cfm).
vocab VocabularyVocabulary (http://www.hl7.org/Special/committees/Vocab/index.cfm).
aid Application Implementation and DesignApplication Implementation and Design (http://www.hl7.org/Special/committees/java/index.cfm).
att Clinical AttachmentsClinical Attachments Workgroup (inactive since mid-2018; work subsumed by Structured Documents and Financial Management). Retained for backwards-compatibility only.
<status value="active"/> <experimental value="false"/> <date value="2020-04-09T21:10:28+00:00"/> <publisher value="HL7 (FHIR Project)"/> <contact> <telecom> <system value="url"/> <value value="http://hl7.org/fhir"/> </telecom> <telecom> <system value="email"/> <value value="fhir@lists.hl7.org"/> </telecom> </contact> <description value="An HL7 administrative unit that owns artifacts in the FHIR specification."/> <caseSensitive value="true"/> <valueSet value="http://terminology.hl7.org/ValueSet/hl7-work-group"/> <content value="complete"/> <concept> <code value="cbcc"/> <display value="Community Based Collaborative Care"/> <definition value="Community Based Collaborative Care (http://www.hl7.org/Special/committees/cbcc/index.cfm)."/> </concept> <concept> <code value="cds"/> <display value="Clinical Decision Support"/> <definition value="Clinical Decision Support (http://www.hl7.org/Special/committees/dss/index.cfm)."/> </concept> <concept> <code value="cqi"/> <display value="Clinical Quality Information"/> <definition value="Clinical Quality Information (http://www.hl7.org/Special/committees/cqi/index.cfm)."/> </concept> <concept> <code value="cg"/> <display value="Clinical Genomics"/> <definition value="Clinical Genomics (http://www.hl7.org/Special/committees/clingenomics/index.cfm)."/> </concept> <concept> <code value="dev"/> <display value="Health Care Devices"/> <definition value="Health Care Devices (http://www.hl7.org/Special/committees/healthcaredevices/index.cfm)."/> </concept> <concept> <code value="ehr"/> <display value="Electronic Health Records"/> <definition value="Electronic Health Records (http://www.hl7.org/special/committees/ehr/index.cfm)."/> </concept> <concept> <code value="fhir"/> <display value="FHIR Infrastructure"/> <definition value="FHIR Infrastructure (http://www.hl7.org/Special/committees/fiwg/index.cfm)."/> </concept> <concept> <code value="fm"/> <display value="Financial Management"/> <definition value="Financial Management (http://www.hl7.org/Special/committees/fm/index.cfm)."/> </concept> <concept> <code value="hsi"/> <display value="Health Standards Integration"/> <definition value="Health Standards Integration (http://www.hl7.org/Special/committees/hsi/index.cfm)."/> </concept> <concept> <code value="ii"/> <display value="Imaging Integration"/> <definition value="Imaging Integration (http://www.hl7.org/Special/committees/imagemgt/index.cfm)."/> </concept> <concept> <code value="inm"/> <display value="Infrastructure And Messaging"/> <definition value="Infrastructure And Messaging (http://www.hl7.org/special/committees/inm/index.cfm)."/> </concept> <concept> <code value="its"/> <display value="Implementable Technology Specifications"/> <definition value="Implementable Technology Specifications (http://www.hl7.org/special/committees/xml/index.cfm)."/> </concept> <concept> <code value="mnm"/> <display value="Modeling and Methodology"/> <definition value="Modeling and Methodology (http://www.hl7.org/Special/committees/mnm/index.cfm)."/> </concept> <concept> <code value="oo"/> <display value="Orders and Observations"/> <definition value="Orders and Observations (http://www.hl7.org/Special/committees/orders/index.cfm)."/> </concept> <concept> <code value="pa"/> <display value="Patient Administration"/> <definition value="Patient Administration (http://www.hl7.org/Special/committees/pafm/index.cfm)."/> </concept> <concept> <code value="pc"/> <display value="Patient Care"/> <definition value="Patient Care (http://www.hl7.org/Special/committees/patientcare/index.cfm)."/> </concept> <concept> <code value="pher"/> <display value="Public Health and Emergency Response"/> <definition value="Public Health and Emergency Response (http://www.hl7.org/Special/committees/pher/index.cfm)."/> </concept> <concept> <code value="phx"/> <display value="Pharmacy"/> <definition value="Pharmacy (http://www.hl7.org/Special/committees/medication/index.cfm)."/> </concept> <concept> <code value="brr"/> <display value="Biomedical Research and Regulation"/> <definition value="Biomedical Research and Regulation (http://www.hl7.org/Special/committees/rcrim/index.cfm)."/> </concept> <concept> <code value="sd"/> <display value="Structured Documents"/> <definition value="Structured Documents (http://www.hl7.org/Special/committees/structure/index.cfm)."/> </concept> <concept> <code value="sec"/> <display value="Security"/> <definition value="Security (http://www.hl7.org/Special/committees/secure/index.cfm)."/> </concept> <concept> <code value="us"/> <display value="US Realm Taskforce"/> <definition value="US Realm Taskforce (http://www.hl7.org/Special/committees/usrealm/index.cfm)."/> </concept> <concept> <code value="vocab"/> <display value="Vocabulary"/> <definition value="Vocabulary (http://www.hl7.org/Special/committees/Vocab/index.cfm)."/> </concept> <concept> <code value="aid"/> <display value="Application Implementation and Design"/> <definition value="Application Implementation and Design (http://www.hl7.org/Special/committees/java/index.cfm)."/> </concept> <concept> <code value="att"/> <display value="Clinical Attachments"/> <definition value="Clinical Attachments Workgroup (inactive since mid-2018; work subsumed by Structured Documents and Financial Management). Retained for backwards-compatibility only."/> </concept> </CodeSystem>