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1.14.1 Named Systems List

The URIs defined on this page are available as a value set (XML or JSON).

1.14.1.1 Known Code Systems

The following names (URIs) may be used in the system element of the Coding data type. If a URI is defined here, it SHALL be used in preference to any other identifying mechanisms. If a code system is not listed here, the correct URI may be determined by working through the following list, in order:

URI Source Comment
http://snomed.info/sct SNOMED CT: (IHTSDO) Concept IDs, Expressions and SNOMED Legacy codes (e.g. SCTV3 codes). This identifies a code defined in the SNOMED CT ecosystem managed by IHTSDO. Note that SNOMED CT is a distributed code systems, and there is no single distribution that contains all defined SNOMED CT codes in all contexts of use.
Rules:
  • Description Ids are not valid.
  • Other identifiers associated with SNOMED CT Concepts using the RF2 identifier infrastructure are not valid in this namespace
  • Expressions use the compositional grammar defined in the SNOMED CT Technical Implementation Guide. Expressions SHOULD NOT contain terms, only concept IDs.

OID=2.16.840.1.113883.6.96
http://loinc.org LOINC (LOINC.org)

LOINC codes are not case sensitive (LOINC defines some codes with alphabetic characters in them)

OID=2.16.840.1.113883.6.1.
http://unitsofmeasure.org UCUM: (UnitsOfMeasure.org) Case Sensitive Codes Generally used in the Quantity Data Type
OID=2.16.840.1.113883.6.8
http://www.radlex.org/ RadLex
OID=2.16.840.1.113883.6.256
http://hl7.org/fhir/sid/icd-10 ICD-10 International (WHO)
OID=2.16.840.1.113883.6.3
http://hl7.org/fhir/sid/icd-9 ICD-9 USA (CDC)
OID=2.16.840.1.113883.6.42
http://hl7.org/fhir/v2/[X](/v) Version 2 table code [X] is the 4 digit identifier for a table. e.g. http://hl7.org/fhir/v2/0203
Only some tables may be treated in this fashion. For some tables, the meaning of the code is version dependent, and so additional information must be included in the namespace, e.g. http://hl7.org/fhir/v2/0123/2.3+, as defined in the v2 table namespace list. Version 2 codes are case sensitive.
OID=2.16.840.1.113883.12.[X] (note that this is the table OID, which is not the same as the codeSystem OID)

Note: This namespace may be revised in the future
http://hl7.org/fhir/v3/[X] A Version 3 code system, from the list of code systems defined here [X] is the code system name. e.g. http://hl7.org/fhir/v3/GenderStatus
OID=[as specified by the index]. Version 3 code systems are case sensitive.

Note: This namespace may be revised in the future
http://www.whocc.no/atc Anatomical Therapeutic Chemical Classification System (WHO)
OID=2.16.840.1.113883.6.73
urn:std:iso:11073:10101 Medical Device Codes defined in ISO 11073-10101 (see RTM Management service)
The ISO/IEEE 11073-10201 Terminology Code is used in the code element, and the Terminology Reference ID is used in the display element (CODE10 and REFID in the reference)
OID=2.16.840.1.113883.6.24
http://nema.org/dicom/dicm DICOM Code Definitions (DCM)
the meanings of codes defined in DICOM, either explicitly or by reference to another part of DICOM or an external reference document or standard
v2/DICOM code="DCM". OID=1.2.840.10008.2.16.4

1.14.1.2 Known Identifier Systems

The following names (URIs) may be used in the system element of the Identifier data type. If a URI is defined here, it SHALL be used in preference to any other identifying mechanisms. If an identifier system is not listed here, the correct URI may be determined by working through the following list, in order:

identifier URI Comment
URIs (W3C): when the identifier is a URI urn:ietf:rfc:3986 As defined by RFC 3986 (with many schemes defined in many RFCs). OIDs and UUIDs are represented in their URN form (urn:oid: and urn:uuid: - plain oid: and uuid: are not used). Note that UUIDs are always lowercase in a IRI
No OID
SSN (US Government) http://hl7.org/fhir/sid/us-ssn US SSN. Represented with dashes removed
OID=2.16.840.1.113883.4.1
Driver's License USA
AK: urn:oid:2.16.840.1.113883.4.3.2
AL: urn:oid:2.16.840.1.113883.4.3.1
AR: urn:oid:2.16.840.1.113883.4.3.5
AZ: urn:oid:2.16.840.1.113883.4.3.4
CA: urn:oid:2.16.840.1.113883.4.3.6
CO: urn:oid:2.16.840.1.113883.4.3.8
CT: urn:oid:2.16.840.1.113883.4.3.9
DC: urn:oid:2.16.840.1.113883.4.3.11
DE: urn:oid:2.16.840.1.113883.4.3.10
FL: urn:oid:2.16.840.1.113883.4.3.12
GA: urn:oid:2.16.840.1.113883.4.3.13
HI: urn:oid:2.16.840.1.113883.4.3.15
IA: urn:oid:2.16.840.1.113883.4.3.19
ID: urn:oid:2.16.840.1.113883.4.3.16
IL: urn:oid:2.16.840.1.113883.4.3.17
KS: urn:oid:2.16.840.1.113883.4.3.20
KY: urn:oid:2.16.840.1.113883.4.3.21
LA: urn:oid:2.16.840.1.113883.4.3.22
MA: urn:oid:2.16.840.1.113883.4.3.25
MD: urn:oid:2.16.840.1.113883.4.3.24
ME: urn:oid:2.16.840.1.113883.4.3.23
MI: urn:oid:2.16.840.1.113883.4.3.26
MN: urn:oid:2.16.840.1.113883.4.3.27
MO: urn:oid:2.16.840.1.113883.4.3.29
MS: urn:oid:2.16.840.1.113883.4.3.28
MT: urn:oid:2.16.840.1.113883.4.3.30
MY: urn:oid:2.16.840.1.113883.4.3.36
NC: urn:oid:2.16.840.1.113883.4.3.37
ND: urn:oid:2.16.840.1.113883.4.3.38
NE: urn:oid:2.16.840.1.113883.4.3.31
NH: urn:oid:2.16.840.1.113883.4.3.33
NJ: urn:oid:2.16.840.1.113883.4.3.34
NM: urn:oid:2.16.840.1.113883.4.3.35
NV: urn:oid:2.16.840.1.113883.4.3.32
OH: urn:oid:2.16.840.1.113883.4.3.39
OK: urn:oid:2.16.840.1.113883.4.3.40
OR: urn:oid:2.16.840.1.113883.4.3.41
PA: urn:oid:2.16.840.1.113883.4.3.42
RI: urn:oid:2.16.840.1.113883.4.3.44
SC: urn:oid:2.16.840.1.113883.4.3.45
SD: urn:oid:2.16.840.1.113883.4.3.46
TN: urn:oid:2.16.840.1.113883.4.3.47
TX: urn:oid:2.16.840.1.113883.4.3.48
UT: urn:oid:2.16.840.1.113883.4.3.49
VA: urn:oid:2.16.840.1.113883.4.3.51
VT: urn:oid:2.16.840.1.113883.4.3.50
WA: urn:oid:2.16.840.1.113883.4.3.53
WI: urn:oid:2.16.840.1.113883.4.3.55
WV: urn:oid:2.16.840.1.113883.4.3.54
WY: urn:oid:2.16.840.1.113883.4.3.56
Driver's licenses are often recorded without recording which authority issued the license. In these cases, use the general identifier http://hl7.org/fhir/drivers-license

Important Note: This list of names is incomplete and subject to change. Some values may be dropped and others will likely be added in the coming months as HL7 institutes formal processes around URIs in vocabulary.

Note that some of the URNs in this list follow the URN specification in RFC 5141 for referring to standards published by ISO, such as urn:std:iso:11073:10101. Where ISO standards define codes with meanings, and there is no entry in the list above, and they are not registered in the HL7 OID registry, the default URN for the code system is that defined by the RFC 5141.

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