diff --git a/adaptivecard/adaptivecard.go b/adaptivecard/adaptivecard.go
index 40cbe4a..98ee236 100644
--- a/adaptivecard/adaptivecard.go
+++ b/adaptivecard/adaptivecard.go
@@ -323,6 +323,13 @@ const (
 	TypeElementTextRun        string = "TextRun" // Introduced in version 1.2
 )
 
+// Known exension types for an Adaptive Card element.
+//
+//   - https://learn.microsoft.com/en-us/microsoftteams/platform/task-modules-and-cards/cards/cards-format?tabs=adaptive-md%2Cdesktop%2Cconnector-html#codeblock-in-adaptive-cards
+const (
+	TypeElementMSTeamsCodeBlock string = "CodeBlock"
+)
+
 // Sentinel errors for this package.
 var (
 	// ErrInvalidType indicates that an invalid type was specified.
@@ -601,6 +608,15 @@ type Element struct {
 	// Separator, when true, indicates that a separating line shown should be
 	// drawn at the top of the element.
 	Separator bool `json:"separator,omitempty"`
+
+	// CodeSnippet provides the content for a CodeBlock element, specific to MSTeams.
+	CodeSnippet string `json:"codeSnippet,omitempty"`
+
+	// Language specifies the langauge of a CodeBlock element, specific to MSTeams.
+	Language string `json:"language,omitempty"`
+
+	// StartLineNumber specifies the initial line number of CodeBlock element, specific to MSTeams.
+	StartLineNumber int `json:"startLineNumber,omitempty"`
 }
 
 // Container is an Element type that allows grouping items together.
@@ -1374,6 +1390,10 @@ func (e Element) Validate() error {
 		v.SelfValidate(TableRows(e.Rows))
 
 		v.SelfValidate(TableColumnDefinitions(e.Columns))
+
+	case e.Type == TypeElementMSTeamsCodeBlock:
+		v.NotEmptyValue(e.CodeSnippet, "CodeSnippet", e.Type, ErrMissingValue)
+		v.NotEmptyValue(e.Language, "Language", e.Type, ErrMissingValue)
 	}
 
 	// Return the last recorded validation error, or nil if no validation
@@ -3145,6 +3165,18 @@ func (c *Card) AddContainer(prepend bool, container Container) error {
 	return nil
 }
 
+// NewCodeBlock creates a new CodeBlock element with snippet, language, and
+// optional firstLine. This is an MSTeams extension element.
+func NewCodeBlock(snippet string, language string, firstLine int) Element {
+	codeBlock := Element{
+		Type:            TypeElementMSTeamsCodeBlock,
+		CodeSnippet:     snippet,
+		Language:        language,
+		StartLineNumber: firstLine,
+	}
+	return codeBlock
+}
+
 // cardBodyHasMention indicates whether an Adaptive Card body contains all
 // specified Mention values. For every user mention, we require at least one
 // match in an applicable Element in the Card Body.
diff --git a/adaptivecard/getters.go b/adaptivecard/getters.go
index c46224e..dbf56a6 100644
--- a/adaptivecard/getters.go
+++ b/adaptivecard/getters.go
@@ -33,6 +33,7 @@ func supportedElementTypes() []string {
 		TypeElementTable, // Introduced in version 1.5
 		TypeElementTextBlock,
 		TypeElementTextRun,
+		TypeElementMSTeamsCodeBlock,
 	}
 }