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Code systems

When working with coded medical data, code systems allow implementers to interpret a coded value in the context of the system which defined it. This is helpful for interoperability since it enables different applications to speak a common language.

However code systems are not referenced consistently across payers. This poses a challenge to implementers who expect, for example, to reference the official URI for the ICD-10 code system http://hl7.org/fhir/sid/icd-10 but instead receive https://icd.who.int/browse10/2019/en in a payload.

Flexpa's API maps non-standardized versions of code system URIs to standardized versions, so that developers can know what to expect in FHIR payloads. This reference documents the code system URIs which developers can expect to appear in FHIR resources that are returned by Flexpa's API.

Please note that Flexpa's system URI map is constantly expanding and improving. If you come across a code system URI that you would like to be standardized, please let us know at support@flexpa.com.

Legend

HL7 lists several types of code systems. They can be categorized as:
  • Code system
    A system that is defined by HL7 FHIR
  • Naming system
    A curated namespace that is often used for the identification of concepts, people, devices, etc.
  • External code system
    A system that is defined by an organization that is external to, but referenced by, HL7. See HL7 External code systems
  • FHIR vendor
    A system that is defined by a FHIR vendor or implementer

Supported code systems

Flexpa's API attempts to map the following code systems in place within FHIR resource payloads. The mapped value is set to the system URI.
NameURIOther IDsCategorySource
ActCodehttp://terminology.hl7.org/CodeSystem/v3-ActCodeurn:oid:2.16.840.1.113883.5.4HL7
Adjudicationhttp://careevolution.com/fhir/AdjudicationCare Evolution
AdjudicationValueCodeshttp://terminology.hl7.org/CodeSystem/adjudicationurn:oid:2.16.840.1.113883.4.642.1.1171HL7
C4BBAdjudicationhttp://hl7.org/fhir/us/carin-bb/CodeSystem/C4BBAdjudicationCARIN Blue Button
C4BBAdjudicationDiscriminatorhttp://hl7.org/fhir/us/carin-bb/CodeSystem/C4BBAdjudicationDiscriminatorCARIN Blue Button
C4BBClaimDiagnosisTypehttp://hl7.org/fhir/us/carin-bb/CodeSystem/C4BBClaimDiagnosisTypeCARIN Blue Button
C4BBClaimProcedureTypehttp://hl7.org/fhir/us/carin-bb/CodeSystem/C4BBClaimProcedureTypeCARIN Blue Button
C4BBPayerAdjudicationStatushttp://hl7.org/fhir/us/carin-bb/CodeSystem/C4BBPayerAdjudicationStatusCARIN Blue Button
C4BBSupportingInfoTypehttp://hl7.org/fhir/us/carin-bb/CodeSystem/C4BBSupportingInfoTypeCARIN Blue Button
CDCREChttp://terminology.hl7.org/NamingSystem/CDCRECurn:oid:2.16.840.1.113883.6.238HL7
CDThttp://www.ada.org/cdturn:oid:2.16.840.1.113883.6.13American Dental Association
ClaimCareTeamRoleCodeshttp://terminology.hl7.org/CodeSystem/claimcareteamroleurn:oid:2.16.840.1.113883.4.642.1.1165HL7
ClaimInformationCategoryCodeshttp://terminology.hl7.org/CodeSystem/claiminformationcategoryurn:oid:2.16.840.1.113883.4.642.1.1163HL7
ClaimPayeeTypeCodeshttp://terminology.hl7.org/CodeSystem/payeetypeurn:oid:2.16.840.1.113883.4.642.1.1050HL7
ClaimTypeCodeshttp://terminology.hl7.org/CodeSystem/claim-typeurn:oid:2.16.840.1.113883.4.642.1.1156HL7
CMSPlaceofServiceCodeshttps://www.cms.gov/Medicare/Coding/place-of-service-codes/Place_of_Service_Code_Seturn:oid:2.16.840.1.113883.15.5CMS
CoInsuranceOptionCShttp://hl7.org/fhir/us/davinci-drug-formulary/CodeSystem/usdf-CoinsuranceOptionCSDaVinci PDex US Drug Formulary
CopayOptionCShttp://hl7.org/fhir/us/davinci-drug-formulary/CodeSystem/usdf-CopayOptionCSDaVinci PDex US Drug Formulary
CoverageClassCodeshttp://terminology.hl7.org/CodeSystem/coverage-classurn:oid:2.16.840.1.113883.4.642.1.1147HL7
CPThttp://www.ama-assn.org/go/cpturn:oid:2.16.840.1.113883.6.12American Medical Association
CVXhttp://hl7.org/fhir/sid/cvxurn:oid:2.16.840.1.113883.12.292Centers for Disease Control and Prevention
DataAbsentReasonhttp://terminology.hl7.org/CodeSystem/data-absent-reasonurn:oid:2.16.840.1.113883.4.642.4.1048HL7
DiagnosticServiceSectionIDhttp://terminology.hl7.org/CodeSystem/v2-0074urn:oid:2.16.840.1.113883.18.29HL7
DrugTierCShttp://hl7.org/fhir/us/davinci-drug-formulary/CodeSystem/usdf-DrugTierCSDaVinci PDex US Drug Formulary
ExampleDiagnosisTypeCodeshttp://terminology.hl7.org/CodeSystem/ex-diagnosistypeurn:oid:2.16.840.1.113883.4.642.1.1167HL7
ExampleServicePlaceCodeshttp://terminology.hl7.org/CodeSystem/ex-serviceplaceurn:oid:2.16.840.1.113883.4.642.1.1157HL7
ExICD10ProcedureCodeshttp://hl7.org/fhir/sid/ex-icd-10-proceduresurn:oid:2.16.840.1.113883.4.642.4.575HL7
HCPCShttps://www.cms.gov/Medicare/Coding/HCPCSReleaseCodeSetsurn:oid:2.16.840.1.113883.6.285CMS
ICD-10http://hl7.org/fhir/sid/icd-10urn:oid:2.16.840.1.113883.6.3World Health Organization
ICD-10-CMhttp://hl7.org/fhir/sid/icd-10-cmurn:oid:2.16.840.1.113883.6.90World Health Organization
ICD-9http://terminology.hl7.org/CodeSystem/icd9urn:oid:2.16.840.1.113883.6.42World Health Organization
ICD-9-CMhttp://terminology.hl7.org/CodeSystem/icd9cmurn:oid:2.16.840.1.113883.6.2World Health Organization
Icd10PCShttp://www.cms.gov/Medicare/Coding/ICD10urn:oid:2.16.840.1.113883.6.4CMS
IdentifierTypehttp://terminology.hl7.org/CodeSystem/v2-0203urn:oid:2.16.840.1.113883.18.108HL7
LOINChttp://loinc.orgurn:oid:2.16.840.1.113883.6.1Regenstrief Institute, Inc.
MDCurn:iso:std:iso:11073:10101urn:oid:2.16.840.1.113883.6.24International Organization for Standardization
MED-RThttp://va.gov/terminology/medrturn:oid:2.16.840.1.113883.6.345National Library of Medicine
NDChttp://hl7.org/fhir/sid/ndcurn:oid:2.16.840.1.113883.6.69US Food and Drug Administration
NDF-RThttp://hl7.org/fhir/ndfrturn:oid:2.16.840.1.113883.6.209US Department of Veterans Affairs, Veterans Health Administration
NPIhttp://terminology.hl7.org/NamingSystem/npiurn:oid:2.16.840.1.113883.4.6HL7
ObservationCategoryCodeshttp://terminology.hl7.org/CodeSystem/observation-categoryurn:oid:2.16.840.1.113883.4.642.1.1125HL7
OrganizationTypehttp://terminology.hl7.org/CodeSystem/organization-typeurn:oid:2.16.840.1.113883.4.642.1.1128HL7
PatientIdhttp://careevolution.com/fhir/PatientIdCare Evolution
pCLOCDhttps://fhir.infoway-inforoute.ca/CodeSystem/pCLOCDurn:oid:2.16.840.1.113883.2.20.5.1Canada Health Infoway
RxNormhttp://www.nlm.nih.gov/research/umls/rxnormurn:oid:2.16.840.1.113883.6.88National Library of Medicine
SNOMEDhttp://snomed.info/scturn:oid:2.16.840.1.113883.6.96IHTSDO / SNOMED International
SubscriberRelationshipCodeshttp://terminology.hl7.org/CodeSystem/subscriber-relationshipurn:oid:2.16.840.1.113883.4.642.1.1386HL7
UCUMhttp://unitsofmeasure.orgurn:oid:2.16.840.1.113883.6.8Regenstrief Institute, Inc.
UNIIhttp://fdasis.nlm.nih.govurn:oid:2.16.840.1.113883.4.9US Food and Drug Administration
UPChttp://terminology.hl7.org/CodeSystem/UPCurn:oid:2.16.840.1.113883.6.55GS1
USEINhttp://terminology.hl7.org/NamingSystem/USEINurn:oid:2.16.840.1.113883.4.4HL7
USPShttps://www.usps.comUnited States Postal Service
Total 52
Note: If you require a specific code system to be supported, contact support@flexpa.com.
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