HL7 Vietnam VN Core FHIR Implementation Guide

Hướng dẫn triển khai FHIR cốt lõi Việt Nam — VN Core FHIR Implementation Guide
0.10.0 - Draft for Community Review Viet Nam cờ

Hướng dẫn triển khai FHIR cốt lõi Việt Nam — VN Core FHIR Implementation Guide - Draft for Community Review (v0.10.0) built by the FHIR (HL7® FHIR® Standard) Build Tools. See the Directory of published versions

Phần mở rộng: Đợt điều trị thuốc gây nghiện — Narcotic Treatment Course Extension - Mô tả chi tiết

Draft tại thời điểm 2026-08-21

Các định nghĩa cho vn-ext-narcotic-treatment-course phần mở rộng

Guidance on how to interpret the contents of this table can be foundhere

0. Extension
Definition

Một đợt điều trị của đơn thuốc gây nghiện giảm đau cho người bệnh ung thư: số thứ tự đợt và khoảng ngày bắt đầu–kết thúc. Căn cứ TT 26/2025/TT-BYT Điều 8 khoản 1: mỗi lần kê đơn tối đa 30 ngày, phải ghi cụ thể 03 đợt điều trị liên tiếp trên một đơn, mỗi đợt không vượt quá 10 ngày, ghi rõ ngày bắt đầu và kết thúc. Extension đặt trên MedicationRequest (cấp ĐƠN, không phải cấp dòng thuốc — mẫu đơn N tại Phụ lục II xếp ba đợt trước mục Thuốc điều trị); ràng buộc số lượng đợt và tính liên tiếp nằm ở profile VNCoreCancerPainNarcoticPrescription. Khi một đơn có nhiều dòng thuốc (nhiều MedicationRequest cùng groupIdentifier), MỌI dòng phải mang cùng một bộ ba đợt — FHIRPath không đọc được resource khác nên ràng buộc liên-dòng do cổng scripts/validate-narcotic-courses.py canh. / One treatment course of a cancer-pain narcotic prescription: course number and its inclusive date range, per Circular 26/2025/TT-BYT Article 8.1.


Optional Extension Element - found in all resources.

ShortĐợt điều trị thuốc gây nghiện — Narcotic Treatment Course ExtensionOptional Extensions Element
Control0..*
This element is affected by the following invariants: ele-1
Is Modifierfalse
Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
2. Extension.extension
Definition

An Extension


May be used to represent additional information that is not part of the basic definition of the element. 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.

ShortExtensionAdditional content defined by implementations
Comments

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.

Control20..*
TypeExtension
Is Modifierfalse
Summaryfalse
Alternate Namesextensions, user content
Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
SlicingThis element introduces a set of slices on Extension.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
  • value @ url
  • 4. Extension.extension:sequence
    Slice Namesequence
    Definition

    An Extension

    ShortSố thứ tự đợt điều trị (1, 2 hoặc 3)Additional content defined by implementations
    Control10..1*
    TypeExtension
    Is Modifierfalse
    Summaryfalse
    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
    ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
    6. Extension.extension:sequence.extension
    Definition

    An Extension


    May be used to represent additional information that is not part of the basic definition of the element. 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.

    ShortExtensionAdditional content defined by implementations
    Comments

    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.

    Control0..0*
    TypeExtension
    Is Modifierfalse
    Summaryfalse
    Alternate Namesextensions, user content
    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
    ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
    SlicingThis element introduces a set of slices on Extension.extension.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
    • value @ url
    • 8. Extension.extension:sequence.url
      Definition

      Source of the definition for the extension code - a logical name or a URL.

      Shortidentifies the meaning of the extension
      Comments

      The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.

      Control1..1
      Typeuri
      Is Modifierfalse
      XML FormatIn the XML format, this property is represented as an attribute.
      Summaryfalse
      Fixed Valuesequence
      10. Extension.extension:sequence.value[x]
      Definition

      Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).

      Short1 | 2 | 3Value of extension
      Control10..1
      TypepositiveInt, date, Meta, Address, Attachment, integer, Count, DataRequirement, Dosage, uuid, Identifier, Coding, SampledData, id, Distance, Period, Duration, canonical, Range, RelatedArtifact, base64Binary, UsageContext, Timing, decimal, CodeableConcept, ParameterDefinition, dateTime, code, string, Contributor, oid, instant, ContactPoint, HumanName, Money, markdown, Ratio, Age, Reference, TriggerDefinition, Quantity, uri, url, Annotation, ContactDetail, boolean, Expression, Signature, unsignedInt, time
      [x] NoteSeeChoice of Data Typesfor further information about how to use [x]
      Is Modifierfalse
      Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
      Summaryfalse
      Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
      12. Extension.extension:period
      Slice Nameperiod
      Definition

      An Extension

      ShortNgày bắt đầu và ngày kết thúc đợt điều trịAdditional content defined by implementations
      Control10..1*
      TypeExtension
      Is Modifierfalse
      Summaryfalse
      Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
      ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
      14. Extension.extension:period.extension
      Definition

      An Extension


      May be used to represent additional information that is not part of the basic definition of the element. 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.

      ShortExtensionAdditional content defined by implementations
      Comments

      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.

      Control0..0*
      TypeExtension
      Is Modifierfalse
      Summaryfalse
      Alternate Namesextensions, user content
      Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
      ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
      SlicingThis element introduces a set of slices on Extension.extension.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
      • value @ url
      • 16. Extension.extension:period.url
        Definition

        Source of the definition for the extension code - a logical name or a URL.

        Shortidentifies the meaning of the extension
        Comments

        The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.

        Control1..1
        Typeuri
        Is Modifierfalse
        XML FormatIn the XML format, this property is represented as an attribute.
        Summaryfalse
        Fixed Valueperiod
        18. Extension.extension:period.value[x]
        Definition

        Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).

        ShortValue of extension
        Control10..1
        TypePeriod, date, Meta, Address, Attachment, integer, Count, DataRequirement, Dosage, uuid, Identifier, Coding, SampledData, id, positiveInt, Distance, Duration, canonical, Range, RelatedArtifact, base64Binary, UsageContext, Timing, decimal, CodeableConcept, ParameterDefinition, dateTime, code, string, Contributor, oid, instant, ContactPoint, HumanName, Money, markdown, Ratio, Age, Reference, TriggerDefinition, Quantity, uri, url, Annotation, ContactDetail, boolean, Expression, Signature, unsignedInt, time
        [x] NoteSeeChoice of Data Typesfor further information about how to use [x]
        Is Modifierfalse
        Summaryfalse
        Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
        20. Extension.extension:period.value[x].start
        Definition

        The start of the period. The boundary is inclusive.

        ShortNgày bắt đầu đợtStarting time with inclusive boundary
        Comments

        If the low element is missing, the meaning is that the low boundary is not known.

        Control10..1
        This element is affected by the following invariants: per-1
        TypedateTime
        Is Modifierfalse
        Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
        Summarytrue
        Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
        22. Extension.extension:period.value[x].end
        Definition

        The end of the period. If the end of the period is missing, it means no end was known or planned at the time the instance was created. The start may be in the past, and the end date in the future, which means that period is expected/planned to end at that time.

        ShortNgày kết thúc đợtEnd time with inclusive boundary, if not ongoing
        Comments

        The high value includes any matching date/time. i.e. 2012-02-03T10:00:00 is in a period that has an end value of 2012-02-03.

        Control10..1
        This element is affected by the following invariants: per-1
        TypedateTime
        Is Modifierfalse
        Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
        Summarytrue
        Meaning if MissingIf the end of the period is missing, it means that the period is ongoing
        Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
        24. Extension.url
        Definition

        Source of the definition for the extension code - a logical name or a URL.

        Shortidentifies the meaning of the extension
        Comments

        The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.

        Control1..1
        Typeuri
        Is Modifierfalse
        XML FormatIn the XML format, this property is represented as an attribute.
        Summaryfalse
        Fixed Valuehttp://fhir.hl7.org.vn/core/StructureDefinition/vn-ext-narcotic-treatment-course
        26. Extension.value[x]
        Definition

        Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).

        ShortValue of extension
        Control0..01
        TypeChoice of: base64Binary, boolean, canonical, code, date, dateTime, decimal, id, instant, integer, markdown, oid, positiveInt, string, time, unsignedInt, uri, url, uuid, Address, Age, Annotation, Attachment, CodeableConcept, Coding, ContactPoint, Count, Distance, Duration, HumanName, Identifier, Money, Period, Quantity, Range, Ratio, Reference, SampledData, Signature, Timing, ContactDetail, Contributor, DataRequirement, Expression, ParameterDefinition, RelatedArtifact, TriggerDefinition, UsageContext, Dosage, Meta
        Is Modifierfalse
        Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
        Summaryfalse
        Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))

        Guidance on how to interpret the contents of this table can be foundhere

        0. Extension
        Definition

        Một đợt điều trị của đơn thuốc gây nghiện giảm đau cho người bệnh ung thư: số thứ tự đợt và khoảng ngày bắt đầu–kết thúc. Căn cứ TT 26/2025/TT-BYT Điều 8 khoản 1: mỗi lần kê đơn tối đa 30 ngày, phải ghi cụ thể 03 đợt điều trị liên tiếp trên một đơn, mỗi đợt không vượt quá 10 ngày, ghi rõ ngày bắt đầu và kết thúc. Extension đặt trên MedicationRequest (cấp ĐƠN, không phải cấp dòng thuốc — mẫu đơn N tại Phụ lục II xếp ba đợt trước mục Thuốc điều trị); ràng buộc số lượng đợt và tính liên tiếp nằm ở profile VNCoreCancerPainNarcoticPrescription. Khi một đơn có nhiều dòng thuốc (nhiều MedicationRequest cùng groupIdentifier), MỌI dòng phải mang cùng một bộ ba đợt — FHIRPath không đọc được resource khác nên ràng buộc liên-dòng do cổng scripts/validate-narcotic-courses.py canh. / One treatment course of a cancer-pain narcotic prescription: course number and its inclusive date range, per Circular 26/2025/TT-BYT Article 8.1.

        ShortĐợt điều trị thuốc gây nghiện — Narcotic Treatment Course Extension
        2. Extension.extension
        Control2..?
        4. Extension.extension:sequence
        Slice Namesequence
        ShortSố thứ tự đợt điều trị (1, 2 hoặc 3)
        Control1..1
        6. Extension.extension:sequence.extension
        Control0..0
        8. Extension.extension:sequence.url
        Fixed Valuesequence
        10. Extension.extension:sequence.value[x]
        Short1 | 2 | 3
        Control1..?
        TypepositiveInt
        [x] NoteSeeChoice of Data Typesfor further information about how to use [x]
        Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
        12. Extension.extension:period
        Slice Nameperiod
        ShortNgày bắt đầu và ngày kết thúc đợt điều trị
        Control1..1
        14. Extension.extension:period.extension
        Control0..0
        16. Extension.extension:period.url
        Fixed Valueperiod
        18. Extension.extension:period.value[x]
        Control1..?
        TypePeriod
        [x] NoteSeeChoice of Data Typesfor further information about how to use [x]
        20. Extension.extension:period.value[x].start
        ShortNgày bắt đầu đợt
        Control1..?
        22. Extension.extension:period.value[x].end
        ShortNgày kết thúc đợt
        Control1..?
        24. Extension.url
        Fixed Valuehttp://fhir.hl7.org.vn/core/StructureDefinition/vn-ext-narcotic-treatment-course
        26. Extension.value[x]
        Control0..0

        Guidance on how to interpret the contents of this table can be foundhere

        0. Extension
        Definition

        Một đợt điều trị của đơn thuốc gây nghiện giảm đau cho người bệnh ung thư: số thứ tự đợt và khoảng ngày bắt đầu–kết thúc. Căn cứ TT 26/2025/TT-BYT Điều 8 khoản 1: mỗi lần kê đơn tối đa 30 ngày, phải ghi cụ thể 03 đợt điều trị liên tiếp trên một đơn, mỗi đợt không vượt quá 10 ngày, ghi rõ ngày bắt đầu và kết thúc. Extension đặt trên MedicationRequest (cấp ĐƠN, không phải cấp dòng thuốc — mẫu đơn N tại Phụ lục II xếp ba đợt trước mục Thuốc điều trị); ràng buộc số lượng đợt và tính liên tiếp nằm ở profile VNCoreCancerPainNarcoticPrescription. Khi một đơn có nhiều dòng thuốc (nhiều MedicationRequest cùng groupIdentifier), MỌI dòng phải mang cùng một bộ ba đợt — FHIRPath không đọc được resource khác nên ràng buộc liên-dòng do cổng scripts/validate-narcotic-courses.py canh. / One treatment course of a cancer-pain narcotic prescription: course number and its inclusive date range, per Circular 26/2025/TT-BYT Article 8.1.

        ShortĐợt điều trị thuốc gây nghiện — Narcotic Treatment Course Extension
        Control0..*
        This element is affected by the following invariants: ele-1
        Is Modifierfalse
        Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
        ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
        2. Extension.id
        Definition

        Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.

        ShortUnique id for inter-element referencing
        Control0..1
        Typestring
        Is Modifierfalse
        XML FormatIn the XML format, this property is represented as an attribute.
        Summaryfalse
        4. Extension.extension
        Definition

        An Extension

        ShortExtension
        Control2..*
        TypeExtension
        Is Modifierfalse
        Summaryfalse
        Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
        ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
        SlicingThis element introduces a set of slices on Extension.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
        • value @ url
        • 6. Extension.extension:sequence
          Slice Namesequence
          Definition

          An Extension

          ShortSố thứ tự đợt điều trị (1, 2 hoặc 3)
          Control1..1
          TypeExtension
          Is Modifierfalse
          Summaryfalse
          Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
          ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
          8. Extension.extension:sequence.id
          Definition

          Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.

          ShortUnique id for inter-element referencing
          Control0..1
          Typestring
          Is Modifierfalse
          XML FormatIn the XML format, this property is represented as an attribute.
          Summaryfalse
          10. Extension.extension:sequence.extension
          Definition

          An Extension

          ShortExtension
          Control0..0
          TypeExtension
          Is Modifierfalse
          Summaryfalse
          Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
          ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
          SlicingThis element introduces a set of slices on Extension.extension.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
          • value @ url
          • 12. Extension.extension:sequence.url
            Definition

            Source of the definition for the extension code - a logical name or a URL.

            Shortidentifies the meaning of the extension
            Comments

            The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.

            Control1..1
            Typeuri
            Is Modifierfalse
            XML FormatIn the XML format, this property is represented as an attribute.
            Summaryfalse
            Fixed Valuesequence
            14. Extension.extension:sequence.value[x]
            Definition

            Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).

            Short1 | 2 | 3
            Control1..1
            TypepositiveInt
            [x] NoteSeeChoice of Data Typesfor further information about how to use [x]
            Is Modifierfalse
            Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
            Summaryfalse
            Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
            16. Extension.extension:period
            Slice Nameperiod
            Definition

            An Extension

            ShortNgày bắt đầu và ngày kết thúc đợt điều trị
            Control1..1
            TypeExtension
            Is Modifierfalse
            Summaryfalse
            Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
            ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
            18. Extension.extension:period.id
            Definition

            Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.

            ShortUnique id for inter-element referencing
            Control0..1
            Typestring
            Is Modifierfalse
            XML FormatIn the XML format, this property is represented as an attribute.
            Summaryfalse
            20. Extension.extension:period.extension
            Definition

            An Extension

            ShortExtension
            Control0..0
            TypeExtension
            Is Modifierfalse
            Summaryfalse
            Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
            ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
            SlicingThis element introduces a set of slices on Extension.extension.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
            • value @ url
            • 22. Extension.extension:period.url
              Definition

              Source of the definition for the extension code - a logical name or a URL.

              Shortidentifies the meaning of the extension
              Comments

              The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.

              Control1..1
              Typeuri
              Is Modifierfalse
              XML FormatIn the XML format, this property is represented as an attribute.
              Summaryfalse
              Fixed Valueperiod
              24. Extension.extension:period.value[x]
              Definition

              Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).

              ShortValue of extension
              Control1..1
              TypePeriod
              [x] NoteSeeChoice of Data Typesfor further information about how to use [x]
              Is Modifierfalse
              Summaryfalse
              Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
              26. Extension.extension:period.value[x].id
              Definition

              Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.

              ShortUnique id for inter-element referencing
              Control0..1
              Typestring
              Is Modifierfalse
              XML FormatIn the XML format, this property is represented as an attribute.
              Summaryfalse
              28. Extension.extension:period.value[x].extension
              Definition

              May be used to represent additional information that is not part of the basic definition of the element. 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.

              ShortAdditional content defined by implementations
              Comments

              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.

              Control0..*
              TypeExtension
              Is Modifierfalse
              Summaryfalse
              Alternate Namesextensions, user content
              Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
              ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
              SlicingThis element introduces a set of slices on Extension.extension.value[x].extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
              • value @ url
              • 30. Extension.extension:period.value[x].start
                Definition

                The start of the period. The boundary is inclusive.

                ShortNgày bắt đầu đợt
                Comments

                If the low element is missing, the meaning is that the low boundary is not known.

                Control1..1
                This element is affected by the following invariants: per-1
                TypedateTime
                Is Modifierfalse
                Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                Summarytrue
                Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                32. Extension.extension:period.value[x].end
                Definition

                The end of the period. If the end of the period is missing, it means no end was known or planned at the time the instance was created. The start may be in the past, and the end date in the future, which means that period is expected/planned to end at that time.

                ShortNgày kết thúc đợt
                Comments

                The high value includes any matching date/time. i.e. 2012-02-03T10:00:00 is in a period that has an end value of 2012-02-03.

                Control1..1
                This element is affected by the following invariants: per-1
                TypedateTime
                Is Modifierfalse
                Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                Summarytrue
                Meaning if MissingIf the end of the period is missing, it means that the period is ongoing
                Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                34. Extension.url
                Definition

                Source of the definition for the extension code - a logical name or a URL.

                Shortidentifies the meaning of the extension
                Comments

                The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.

                Control1..1
                Typeuri
                Is Modifierfalse
                XML FormatIn the XML format, this property is represented as an attribute.
                Summaryfalse
                Fixed Valuehttp://fhir.hl7.org.vn/core/StructureDefinition/vn-ext-narcotic-treatment-course
                36. Extension.value[x]
                Definition

                Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).

                ShortValue of extension
                Control0..0
                TypeChoice of: base64Binary, boolean, canonical, code, date, dateTime, decimal, id, instant, integer, markdown, oid, positiveInt, string, time, unsignedInt, uri, url, uuid, Address, Age, Annotation, Attachment, CodeableConcept, Coding, ContactPoint, Count, Distance, Duration, HumanName, Identifier, Money, Period, Quantity, Range, Ratio, Reference, SampledData, Signature, Timing, ContactDetail, Contributor, DataRequirement, Expression, ParameterDefinition, RelatedArtifact, TriggerDefinition, UsageContext, Dosage, Meta
                Is Modifierfalse
                Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                Summaryfalse
                Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))