diff --git a/src/main/java/net/sf/jsqlparser/statement/merge/MergeInsert.java b/src/main/java/net/sf/jsqlparser/statement/merge/MergeInsert.java
index bc9ea695a..f6affa3ef 100644
--- a/src/main/java/net/sf/jsqlparser/statement/merge/MergeInsert.java
+++ b/src/main/java/net/sf/jsqlparser/statement/merge/MergeInsert.java
@@ -20,10 +20,19 @@
 
 public class MergeInsert implements Serializable {
 
+    private Expression andPredicate;
     private ExpressionList<Column> columns;
     private ExpressionList<Expression> values;
     private Expression whereCondition;
 
+    public Expression getAndPredicate() {
+        return andPredicate;
+    }
+
+    public void setAndPredicate(Expression andPredicate) {
+        this.andPredicate = andPredicate;
+    }
+
     public ExpressionList<Column> getColumns() {
         return columns;
     }
@@ -50,12 +59,25 @@ public void setWhereCondition(Expression whereCondition) {
 
     @Override
     public String toString() {
-        return " WHEN NOT MATCHED THEN INSERT "
-                + (columns != null ? columns.toString() : "")
-                + " VALUES " + values.toString()
-                + (whereCondition != null
-                        ? " WHERE " + whereCondition
-                        : "");
+        StringBuilder b = new StringBuilder();
+        b.append(" WHEN NOT MATCHED");
+        if (andPredicate != null) {
+            b.append(" AND ").append(andPredicate.toString());
+        }
+        b.append(" THEN INSERT ");
+        if (columns != null) {
+            b.append(columns.toString());
+        }
+        b.append(" VALUES ").append(values.toString());
+        if (whereCondition != null) {
+            b.append(" WHERE ").append(whereCondition.toString());
+        }
+        return b.toString();
+    }
+
+    public MergeInsert withAndPredicate(Expression andPredicate) {
+        this.setAndPredicate(andPredicate);
+        return this;
     }
 
     public MergeInsert withColumns(ExpressionList<Column> columns) {
@@ -95,6 +117,10 @@ public MergeInsert withWhereCondition(Expression whereCondition) {
         return this;
     }
 
+    public <E extends Expression> E getAndPredicate(Class<E> type) {
+        return type.cast(getAndPredicate());
+    }
+
     public <E extends Expression> E getWhereCondition(Class<E> type) {
         return type.cast(getWhereCondition());
     }
diff --git a/src/main/java/net/sf/jsqlparser/util/deparser/StatementDeParser.java b/src/main/java/net/sf/jsqlparser/util/deparser/StatementDeParser.java
index 93a2af08c..732ef3e39 100644
--- a/src/main/java/net/sf/jsqlparser/util/deparser/StatementDeParser.java
+++ b/src/main/java/net/sf/jsqlparser/util/deparser/StatementDeParser.java
@@ -255,7 +255,12 @@ public void visit(Merge merge) {
     }
 
     private void deparseMergeInsert(MergeInsert mergeInsert) {
-        buffer.append(" WHEN NOT MATCHED THEN INSERT ");
+        buffer.append(" WHEN NOT MATCHED");
+        if (mergeInsert.getAndPredicate() != null) {
+            buffer.append(" AND ");
+            mergeInsert.getAndPredicate().accept(expressionDeParser);
+        }
+        buffer.append(" THEN INSERT ");
         if (mergeInsert.getColumns() != null) {
             mergeInsert.getColumns().accept(expressionDeParser);
         }
diff --git a/src/main/jjtree/net/sf/jsqlparser/parser/JSqlParserCC.jjt b/src/main/jjtree/net/sf/jsqlparser/parser/JSqlParserCC.jjt
index 91d49c82b..7905024a5 100644
--- a/src/main/jjtree/net/sf/jsqlparser/parser/JSqlParserCC.jjt
+++ b/src/main/jjtree/net/sf/jsqlparser/parser/JSqlParserCC.jjt
@@ -1695,12 +1695,15 @@ MergeUpdate MergeUpdateClause() : {
 
 MergeInsert MergeInsertClause() : {
     MergeInsert mi = new MergeInsert();
+    Expression predicate;
     ExpressionList<Column> columns;
     ExpressionList expList;
     Expression condition;
 }
 {
-    <K_WHEN> <K_NOT> <K_MATCHED> <K_THEN>
+    <K_WHEN> <K_NOT> <K_MATCHED>
+    [ <K_AND> predicate = Expression() { mi.setAndPredicate(predicate); } ]
+    <K_THEN>
         <K_INSERT>
         [ "(" columns = ColumnList() ")"
             {
diff --git a/src/test/java/net/sf/jsqlparser/statement/merge/MergeTest.java b/src/test/java/net/sf/jsqlparser/statement/merge/MergeTest.java
index 94ff0557d..5034be8cd 100644
--- a/src/test/java/net/sf/jsqlparser/statement/merge/MergeTest.java
+++ b/src/test/java/net/sf/jsqlparser/statement/merge/MergeTest.java
@@ -254,4 +254,13 @@ public void testSnowflakeMergeStatementWithMatchedAndPredicate() throws JSQLPars
 
         assertSqlCanBeParsedAndDeparsed(sql, true);
     }
+
+    @Test
+    void testSnowflakeMergeStatementWithNotMatchedAndPredicate() throws JSQLParserException {
+        String sql = "MERGE INTO target USING (select k, max(v) as v from src group by k) AS b ON target.k = b.k\n" +
+                "  WHEN MATCHED THEN UPDATE SET target.v = b.v\n" +
+                "  WHEN NOT MATCHED AND b.v != 11 THEN INSERT (k, v) VALUES (b.k, b.v)";
+
+        assertSqlCanBeParsedAndDeparsed(sql, true);
+    }
 }