Da Vinci - Coverage Requirements Discovery
2.2.0-snapshot - STU 2.2 Peer Review

Da Vinci - Coverage Requirements Discovery, published by HL7 International / Financial Management. This guide is not an authorized publication; it is the continuous build for version 2.2.0-snapshot built by the FHIR (HL7® FHIR® Standard) CI Build. This version is based on the current content of https://github.com/HL7/davinci-crd/ and changes regularly. See the Directory of published versions

## Data Type Profile: CDS Hooks Service Request Requested CRD Version Extension - JSON Profile

Page standards status: Trial-use | Maturity Level: 4

JSON representation of the CDSHookServiceRequestExtensionRequestCRDVersion data type profile.

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    {
      "resourceType" : "StructureDefinition",
      "id" : "CDSHookServiceRequestExtensionRequestCRDVersion",
      "language" : "en",
      "text" : {
        "status" : "extensions",
        "div" : "<div xmlns=\"http://www.w3.org/1999/xhtml\"><p class=\"res-header-id\"><b>Generated Narrative: StructureDefinition CDSHookServiceRequestExtensionRequestCRDVersion</b></p><a name=\"CDSHookServiceRequestExtensionRequestCRDVersion\"> </a><a name=\"hcCDSHookServiceRequestExtensionRequestCRDVersion\"> </a><table border=\"0\" cellpadding=\"0\" cellspacing=\"0\" style=\"border: 0px #F0F0F0 solid; font-size: 11px; font-family: verdana; vertical-align: top;\"><tr style=\"border: 1px #F0F0F0 solid; font-size: 11px; font-family: verdana; vertical-align: top\"><th style=\"vertical-align: top; text-align : var(--ig-left,left); background-color: white; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px; padding-top: 3px; padding-bottom: 3px\" class=\"hierarchy\"><a href=\"https://build.fhir.org/ig/FHIR/ig-guidance/readingIgs.html#table-views\" title=\"The logical name of the element\">Name</a></th><th style=\"vertical-align: top; text-align : var(--ig-left,left); background-color: white; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px; padding-top: 3px; padding-bottom: 3px\" class=\"hierarchy\"><a href=\"https://build.fhir.org/ig/FHIR/ig-guidance/readingIgs.html#table-views\" title=\"Information about the use of the element\">Flags</a></th><th style=\"vertical-align: top; text-align : var(--ig-left,left); background-color: white; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px; padding-top: 3px; padding-bottom: 3px\" class=\"hierarchy\"><a href=\"https://build.fhir.org/ig/FHIR/ig-guidance/readingIgs.html#table-views\" title=\"Minimum and Maximum # of times the element can appear in the instance\">Card.</a></th><th style=\"vertical-align: top; text-align : var(--ig-left,left); background-color: white; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px; padding-top: 3px; padding-bottom: 3px; width: 100px\" class=\"hierarchy\"><a href=\"https://build.fhir.org/ig/FHIR/ig-guidance/readingIgs.html#table-views\" title=\"Reference to the type of the element\">Type</a></th><th style=\"vertical-align: top; text-align : var(--ig-left,left); background-color: white; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px; padding-top: 3px; padding-bottom: 3px\" class=\"hierarchy\"><a href=\"https://build.fhir.org/ig/FHIR/ig-guidance/readingIgs.html#table-views\" title=\"Additional information about the element\">Description &amp; Constraints</a><span style=\"float: right\"><a href=\"https://build.fhir.org/ig/FHIR/ig-guidance/readingIgs.html#table-views\" title=\"Legend for this format\"><img src=\"data:image/png;base64, \" alt=\"doco\" style=\"background-color: inherit\"/></a></span></th></tr><tr style=\"border: 0px #F0F0F0 solid; padding:0px; vertical-align: top; background-color: white\"><td style=\"vertical-align: top; text-align : var(--ig-left,left); background-color: white; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px; white-space: nowrap; background-image: url(tbl_bck0.png)\" class=\"hierarchy\"><img src=\"tbl_spacer.png\" alt=\".\" style=\"background-color: inherit\" class=\"hierarchy\"/><img src=\"icon_element.gif\" alt=\".\" style=\"background-color: white; background-color: inherit\" title=\"Element\" class=\"hierarchy\"/> <a href=\"StructureDefinition-CDSHookServiceRequestExtensionRequestCRDVersion-definitions.html#string\" title=\"Indicates the CRD version the service response needs to comply with.  (If this is not a version supported by the service, it **SHALL** return an error.)\">string</a><a name=\"string\"> </a></td><td style=\"vertical-align: top; text-align : var(--ig-left,left); background-color: white; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px\" class=\"hierarchy\"/><td style=\"vertical-align: top; text-align : var(--ig-left,left); background-color: white; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px\" class=\"hierarchy\"><span style=\"opacity: 0.5\">0</span>..1</td><td style=\"vertical-align: top; text-align : var(--ig-left,left); background-color: white; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px\" class=\"hierarchy\"><a href=\"http://hl7.org/fhir/R4/datatypes.html#string\">string</a></td><td style=\"vertical-align: top; text-align : var(--ig-left,left); background-color: white; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px\" class=\"hierarchy\">CRD version requested by the client<br/><span style=\"font-weight:bold\">JSON Property Name for Type: </span><code>davinci-crd.requestedVersion</code></td></tr>\r\n<tr><td colspan=\"5\" class=\"hierarchy\"><br/><a href=\"https://build.fhir.org/ig/FHIR/ig-guidance/readingIgs.html#table-views\" title=\"Legend for this format\"><img src=\"data:image/png;base64, \" alt=\"doco\" style=\"background-color: inherit\"/> Documentation for this format</a></td></tr></table></div>"
      },
      "extension" : [
        {
          "url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-wg",
          "valueCode" : "fm"
        },
        {
          "url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-fmm",
          "valueInteger" : 4,
          "_valueInteger" : {
            "extension" : [
              {
                "url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-conformance-derivedFrom",
                "valueCanonical" : "http://hl7.org/fhir/us/davinci-crd/ImplementationGuide/davinci-crd"
              }
            ]
          }
        },
        {
          "url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-standards-status",
          "valueCode" : "trial-use",
          "_valueCode" : {
            "extension" : [
              {
                "url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-conformance-derivedFrom",
                "valueCanonical" : "http://hl7.org/fhir/us/davinci-crd/ImplementationGuide/davinci-crd"
              }
            ]
          }
        }
      ],
      "url" : "http://hl7.org/fhir/us/davinci-crd/StructureDefinition/CDSHookServiceRequestExtensionRequestCRDVersion",
      "identifier" : [
        {
          "system" : "urn:ietf:rfc:3986",
          "value" : "urn:oid:2.16.840.1.113883.4.642.40.18.42.49"
        }
      ],
      "version" : "2.2.0-snapshot",
      "name" : "CDSHookServiceRequestExtensionRequestCRDVersion",
      "title" : "CDS Hooks Service Request Requested CRD Version Extension",
      "status" : "active",
      "experimental" : false,
      "date" : "2026-02-19T15:54:35+00:00",
      "publisher" : "HL7 International / Financial Management",
      "contact" : [
        {
          "telecom" : [
            {
              "system" : "url",
              "value" : "http://www.hl7.org/Special/committees/fm"
            }
          ]
        }
      ],
      "description" : "Allows indicating the desired CRD version when invoking CRD on a service that supports multiple versions",
      "jurisdiction" : [
        {
          "coding" : [
            {
              "system" : "urn:iso:std:iso:3166",
              "code" : "US"
            }
          ]
        }
      ],
      "fhirVersion" : "4.0.1",
      "kind" : "primitive-type",
      "abstract" : false,
      "context" : [
        {
          "type" : "element",
          "expression" : "CDSHooksRequest.extension"
        }
      ],
      "type" : "string",
      "baseDefinition" : "http://hl7.org/fhir/StructureDefinition/string",
      "derivation" : "constraint",
      "snapshot" : {
        "extension" : [
          {
            "url" : "http://hl7.org/fhir/tools/StructureDefinition/snapshot-base-version",
            "valueString" : "4.0.1"
          }
        ],
        "element" : [
          {
            "id" : "string",
            "extension" : [
              {
                "url" : "http://hl7.org/fhir/tools/StructureDefinition/json-name",
                "valueString" : "davinci-crd.requestedVersion"
              }
            ],
            "path" : "string",
            "short" : "CRD version requested by the client",
            "definition" : "Indicates the CRD version the service response needs to comply with.  (If this is not a version supported by the service, it **SHALL** return an error.)",
            "comment" : "Note that FHIR strings SHALL NOT exceed 1MB in size",
            "min" : 0,
            "max" : "1",
            "base" : {
              "path" : "string",
              "min" : 0,
              "max" : "*"
            },
            "constraint" : [
              {
                "key" : "ele-1",
                "severity" : "error",
                "human" : "All FHIR elements must have a @value or children",
                "expression" : "hasValue() or (children().count() > id.count())",
                "xpath" : "@value|f:*|h:div",
                "source" : "http://hl7.org/fhir/StructureDefinition/Element"
              }
            ],
            "isModifier" : false,
            "isSummary" : false
          },
          {
            "id" : "string.id",
            "path" : "string.id",
            "representation" : [
              "xmlAttr"
            ],
            "short" : "xml:id (or equivalent in JSON)",
            "definition" : "unique id for the element within a resource (for internal references)",
            "min" : 0,
            "max" : "1",
            "base" : {
              "path" : "Element.id",
              "min" : 0,
              "max" : "1"
            },
            "type" : [
              {
                "extension" : [
                  {
                    "url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-fhir-type",
                    "valueUrl" : "string"
                  }
                ],
                "code" : "http://hl7.org/fhirpath/System.String"
              }
            ],
            "isModifier" : false,
            "isSummary" : false
          },
          {
            "id" : "string.extension",
            "path" : "string.extension",
            "short" : "Additional content defined by implementations",
            "definition" : "May be used to represent additional information that is not part of the basic definition of the resource. To make the use of extensions safe and manageable, there is a strict set of governance  applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.",
            "comment" : "There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions.  The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.",
            "alias" : [
              "extensions",
              "user content"
            ],
            "min" : 0,
            "max" : "*",
            "base" : {
              "path" : "Element.extension",
              "min" : 0,
              "max" : "*"
            },
            "type" : [
              {
                "code" : "Extension"
              }
            ],
            "constraint" : [
              {
                "key" : "ele-1",
                "severity" : "error",
                "human" : "All FHIR elements must have a @value or children",
                "expression" : "hasValue() or (children().count() > id.count())",
                "xpath" : "@value|f:*|h:div",
                "source" : "http://hl7.org/fhir/StructureDefinition/Element"
              },
              {
                "key" : "ext-1",
                "severity" : "error",
                "human" : "Must have either extensions or value[x], not both",
                "expression" : "extension.exists() != value.exists()",
                "xpath" : "exists(f:extension)!=exists(f:*[starts-with(local-name(.), 'value')])",
                "source" : "http://hl7.org/fhir/StructureDefinition/Extension"
              }
            ],
            "isModifier" : false,
            "isSummary" : false
          },
          {
            "id" : "string.value",
            "path" : "string.value",
            "representation" : [
              "xmlAttr"
            ],
            "short" : "Primitive value for string",
            "definition" : "The actual value",
            "min" : 0,
            "max" : "1",
            "base" : {
              "path" : "string.value",
              "min" : 0,
              "max" : "1"
            },
            "type" : [
              {
                "extension" : [
                  {
                    "url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-fhir-type",
                    "valueUrl" : "string"
                  },
                  {
                    "url" : "http://hl7.org/fhir/StructureDefinition/regex",
                    "valueString" : "[ \\r\\n\\t\\S]+"
                  }
                ],
                "code" : "http://hl7.org/fhirpath/System.String"
              }
            ],
            "maxLength" : 1048576,
            "isModifier" : false,
            "isSummary" : false
          }
        ]
      },
      "differential" : {
        "element" : [
          {
            "id" : "string",
            "extension" : [
              {
                "url" : "http://hl7.org/fhir/tools/StructureDefinition/json-name",
                "valueString" : "davinci-crd.requestedVersion"
              }
            ],
            "path" : "string",
            "short" : "CRD version requested by the client",
            "definition" : "Indicates the CRD version the service response needs to comply with.  (If this is not a version supported by the service, it **SHALL** return an error.)",
            "max" : "1"
          }
        ]
      }
    }