Alternative extension - Corti API Documentation

The alternative extension lists other codes that could also fit a coded field of a FHIR Extraction resource. The endpoint picks one code for the field and puts up to 10 runners-up here, best first. It is a complex extension: it has no value of its own, only sub-extensions. Every value points back to the note shows how to use it.

Definition

Property	Value
Canonical URL	`https://docs.corti.ai/fhir/StructureDefinition/alternative`
FHIR version	R4 (4.0.1)
Context	Condition, AllergyIntolerance, FamilyMemberHistory, Procedure, Observation
Cardinality on a resource	`0..*`: one alternative extension per field that has alternatives

Systems that do not know the extension can ignore it. It never changes the meaning of the resource: the code on the field itself is the one the endpoint chose.

Sub-extensions

Sub-extension `url`	Cardinality	Value	Definition
`field`	`1..1`	`valueString`	The field the alternatives are for
`alternative`	`1..10`	`valueCodeableConcept`	One alternative code, with the same coding system as the field

Field values

Resource	`field` values
Condition	`code`, `bodySite`
AllergyIntolerance	`code`
FamilyMemberHistory	`condition.code`
Procedure	`code`, `bodySite`
Observation	`code`, `bodySite`

Example

{
  "url": "https://docs.corti.ai/fhir/StructureDefinition/alternative",
  "extension": [
    { "url": "field", "valueString": "code" },
    {
      "url": "alternative",
      "valueCodeableConcept": {
        "coding": [
          { "system": "http://snomed.info/sct", "code": "443694000", "display": "Uncontrolled type 2 diabetes mellitus" }
        ],
        "text": "Uncontrolled type 2 diabetes mellitus"
      }
    }
  ]
}

Mention extension: the words in the note that support a field
FHIR datatypes: how extensions sit on a resource