Cross-Version Extension for AllergyIntolerance.type in R2

Context of Use

This extension may be used in the following contexts:

• element AllergyIntolerance (For version R5)
• extension http://hl7.org/fhir/5.0/StructureDefinition/extension-AllergyIntolerance

Name	Flags	Card.	Type	Description & Constraints
Extension		0..1	Extension	allergy | intolerance - Underlying mechanism (if known)
extension		..0
value[x]		1..
url				"http://hl7.org/fhir/1.0/StructureDefinition/extension-AllergyIntolerance.type"
Documentation for this format

{
  "resourceType" : "StructureDefinition",
  "id" : "xv-r2-ait.type",
  "url" : "http://hl7.org/fhir/1.0/StructureDefinition/extension-AllergyIntolerance.type",
  "name" : "XVerExtensionAllergyIntolerance.typeR2",
  "title" : "Cross-Version Extension for AllergyIntolerance.type in R2",
  "status" : "active",
  "experimental" : false,
  "publisher" : "Health Level Seven International (Patient Care)",
  "contact" : [{
    "telecom" : [{
      "system" : "other",
      "value" : "http://hl7.org/fhir"
    }]
  },
  {
    "telecom" : [{
      "system" : "other",
      "value" : "http://www.hl7.org/Special/committees/patientcare/index.cfm"
    }]
  }],
  "description" : "Cross-Version Extension for AllergyIntolerance.type. Valid in versions R5\r\n\r\nThis is a valid extension because the types code were removed in a later version",
  "jurisdiction" : [{
    "coding" : [{
      "system" : "http://unstats.un.org/unsd/methods/m49/m49.htm",
      "code" : "001"
    }]
  }],
  "fhirVersion" : "5.0.0",
  "kind" : "complex-type",
  "abstract" : false,
  "context" : [{
    "extension" : [{
      "extension" : [{
        "url" : "startFhirVersion",
        "valueCode" : "5.0"
      },
      {
        "url" : "endFhirVersion",
        "valueCode" : "5.0"
      }],
      "url" : "http://hl7.org/fhir/StructureDefinition/version-specific-use"
    }],
    "type" : "element",
    "expression" : "AllergyIntolerance"
  },
  {
    "type" : "extension",
    "expression" : "http://hl7.org/fhir/5.0/StructureDefinition/extension-AllergyIntolerance"
  }],
  "type" : "Extension",
  "baseDefinition" : "http://hl7.org/fhir/StructureDefinition/Extension",
  "derivation" : "constraint",
  "differential" : {
    "element" : [{
      "path" : "Extension",
      "short" : "allergy | intolerance - Underlying mechanism (if known)",
      "definition" : "Identification of the underlying physiological mechanism for the reaction risk.",
      "comment" : "Allergic (typically immune-mediated) reactions have been traditionally regarded as an indicator for potential escalation to significant future risk. Contemporary knowledge suggests that some reactions previously thought to be immune-mediated are, in fact, non-immune, but in some cases can still pose a life threatening risk. It is acknowledged that many clinicians may not be in a position to distinguish the mechanism of a particular reaction. Often the term \"allergy\" is used rather generically and may overlap with the use of \"intolerance\" - in practice the boundaries between these two concepts may not be well-defined or understood. This data element is included nevertheless, because many legacy systems have captured this attribute. Immunologic testing may provide supporting evidence for the basis of the reaction and the causative substance, but no tests are 100% sensitive or specific for sensitivity to a particular substance. If, as is commonly the case, it is unclear whether the reaction is due to an allergy or an intolerance, then the type element should be omitted from the resource.",
      "alias" : ["Category",
      "Class"],
      "min" : 0,
      "max" : "1",
      "isModifier" : false,
      "mapping" : [{
        "identity" : "v2",
        "map" : "IAM-9"
      },
      {
        "identity" : "w5",
        "map" : "class"
      }]
    },
    {
      "path" : "Extension.extension",
      "max" : "0"
    },
    {
      "path" : "Extension.value[x]",
      "min" : 1
    },
    {
      "path" : "Extension.url",
      "fixedUri" : "http://hl7.org/fhir/1.0/StructureDefinition/extension-AllergyIntolerance.type"
    }]
  }
}