diff --git a/compiler/ballerina-lang/src/main/java/org/wso2/ballerinalang/compiler/bir/BIRGen.java b/compiler/ballerina-lang/src/main/java/org/wso2/ballerinalang/compiler/bir/BIRGen.java
index 92ad0a013262..706d56bf2b18 100644
--- a/compiler/ballerina-lang/src/main/java/org/wso2/ballerinalang/compiler/bir/BIRGen.java
+++ b/compiler/ballerina-lang/src/main/java/org/wso2/ballerinalang/compiler/bir/BIRGen.java
@@ -2808,7 +2808,7 @@ private void generateMappingAccess(BLangIndexBasedAccess astIndexBasedAccessExpr
             if (astIndexBasedAccessExpr.getKind() == NodeKind.XML_ATTRIBUTE_ACCESS_EXPR) {
                 insKind = InstructionKind.XML_ATTRIBUTE_LOAD;
                 keyRegIndex = getQNameOP(astIndexBasedAccessExpr.indexExpr, keyRegIndex);
-            } else if (TypeTags.isXMLTypeTag(astAccessExprExprType.tag)) {
+            } else if (types.isAssignable(astAccessExprExprType, symTable.xmlType)) {
                 generateXMLAccess((BLangXMLAccessExpr) astIndexBasedAccessExpr, tempVarRef, varRefRegIndex,
                         keyRegIndex);
                 this.varAssignment = variableStore;
diff --git a/compiler/ballerina-lang/src/main/java/org/wso2/ballerinalang/compiler/bir/codegen/methodgen/MethodGen.java b/compiler/ballerina-lang/src/main/java/org/wso2/ballerinalang/compiler/bir/codegen/methodgen/MethodGen.java
index 3e2bebf2bdf3..be62805253fd 100644
--- a/compiler/ballerina-lang/src/main/java/org/wso2/ballerinalang/compiler/bir/codegen/methodgen/MethodGen.java
+++ b/compiler/ballerina-lang/src/main/java/org/wso2/ballerinalang/compiler/bir/codegen/methodgen/MethodGen.java
@@ -754,7 +754,7 @@ private void generateFrameClassFieldLoad(List<BIRVariableDcl> localVars, MethodV
                 mv.visitFieldInsn(GETFIELD, frameName, localVar.jvmVarName,
                         GET_BSTRING);
                 mv.visitVarInsn(ASTORE, index);
-            } else if (TypeTags.isXMLTypeTag(bType.tag)) {
+            } else if (types.isAssignable(bType, symbolTable.xmlType)) {
                 mv.visitFieldInsn(GETFIELD, frameName, localVar.jvmVarName,
                         GET_XML);
                 mv.visitVarInsn(ASTORE, index);
diff --git a/compiler/ballerina-lang/src/main/java/org/wso2/ballerinalang/compiler/desugar/Desugar.java b/compiler/ballerina-lang/src/main/java/org/wso2/ballerinalang/compiler/desugar/Desugar.java
index d27017ae9bc7..5648cd152789 100644
--- a/compiler/ballerina-lang/src/main/java/org/wso2/ballerinalang/compiler/desugar/Desugar.java
+++ b/compiler/ballerina-lang/src/main/java/org/wso2/ballerinalang/compiler/desugar/Desugar.java
@@ -6433,7 +6433,7 @@ public void visit(BLangIndexBasedAccess indexAccessExpr) {
         } else if (types.isSubTypeOfList(varRefType)) {
             targetVarRef = new BLangArrayAccessExpr(indexAccessExpr.pos, indexAccessExpr.expr,
                                                     indexAccessExpr.indexExpr);
-        } else if (TypeTags.isXMLTypeTag(varRefType.tag)) {
+        } else if (types.isAssignable(varRefType, symTable.xmlType)) {
             targetVarRef = new BLangXMLAccessExpr(indexAccessExpr.pos, indexAccessExpr.expr,
                     indexAccessExpr.indexExpr);
         } else if (types.isAssignable(varRefType, symTable.stringType)) {
diff --git a/compiler/ballerina-lang/src/main/java/org/wso2/ballerinalang/compiler/semantics/analyzer/TypeChecker.java b/compiler/ballerina-lang/src/main/java/org/wso2/ballerinalang/compiler/semantics/analyzer/TypeChecker.java
index c4fdef5dae33..2794eea05736 100644
--- a/compiler/ballerina-lang/src/main/java/org/wso2/ballerinalang/compiler/semantics/analyzer/TypeChecker.java
+++ b/compiler/ballerina-lang/src/main/java/org/wso2/ballerinalang/compiler/semantics/analyzer/TypeChecker.java
@@ -8703,7 +8703,7 @@ private BType checkIndexAccessExpr(BLangIndexBasedAccess indexBasedAccessExpr, A
 
             indexBasedAccessExpr.originalType = symTable.charStringType;
             actualType = symTable.charStringType;
-        } else if (TypeTags.isXMLTypeTag(varRefType.tag)) {
+        } else if (types.isAssignable(varRefType, symTable.xmlType)) {
             if (indexBasedAccessExpr.isLValue) {
                 indexExpr.setBType(symTable.semanticError);
                 dlog.error(indexBasedAccessExpr.pos, DiagnosticErrorCode.CANNOT_UPDATE_XML_SEQUENCE);
diff --git a/tests/jballerina-unit-test/src/test/java/org/ballerinalang/test/types/xml/XMLAccessTest.java b/tests/jballerina-unit-test/src/test/java/org/ballerinalang/test/types/xml/XMLAccessTest.java
index 4d45e9e88951..6b1b63b1ae96 100644
--- a/tests/jballerina-unit-test/src/test/java/org/ballerinalang/test/types/xml/XMLAccessTest.java
+++ b/tests/jballerina-unit-test/src/test/java/org/ballerinalang/test/types/xml/XMLAccessTest.java
@@ -259,6 +259,11 @@ public void testLengthOfXMLSequence() {
         Assert.assertEquals(returns.get(3), 2L);
     }
 
+    @Test
+    public void testInvalidXMLUnionAccessWithNegativeIndex() {
+        BRunUtil.invoke(result, "testInvalidXMLUnionAccessWithNegativeIndex");
+    }
+
     @Test
     public void testInvalidXMLAccessWithNegativeIndex() {
         BRunUtil.invoke(result, "testInvalidXMLAccessWithNegativeIndex");
@@ -269,6 +274,11 @@ public void testXmlAccessWithLargerIndex() {
         BRunUtil.invoke(result, "testXmlAccessWithLargerIndex");
     }
 
+    @Test
+    public void testXmlIndexedAccessWithUnionType() {
+        BRunUtil.invoke(result, "testXmlIndexedAccessWithUnionType");
+    }
+
     @Test
     public void testXMLNavExpressionNegative() {
         String methodInvocMessage = "method invocations are not yet supported within XML navigation expressions, " +
diff --git a/tests/jballerina-unit-test/src/test/resources/test-src/types/xml/xml-indexed-access.bal b/tests/jballerina-unit-test/src/test/resources/test-src/types/xml/xml-indexed-access.bal
index e45c0218b6e9..5932de9c9c63 100644
--- a/tests/jballerina-unit-test/src/test/resources/test-src/types/xml/xml-indexed-access.bal
+++ b/tests/jballerina-unit-test/src/test/resources/test-src/types/xml/xml-indexed-access.bal
@@ -444,6 +444,150 @@ function testXmlAccessWithLargerIndex() {
     assert(xmlValue, xml ``);
 }
 
+type XmlType1 xml:Text|xml:Comment;
+
+type XmlType2 xml<xml:Element|xml:ProcessingInstruction>;
+
+type XmlType3 XmlType1|XmlType2;
+
+function testXmlIndexedAccessWithUnionType() {
+    xml value;
+    xml:Element|xml:Comment x1 = xml `<a>abc</a>`;
+    value = x1[0];
+    assert(value, xml `<a>abc</a>`);
+    assertTrue(typeof value is typedesc<xml:Element>);
+    value = x1[1];
+    assert(value, xml ``);
+    assertTrue(typeof value is typedesc<xml:Text>);
+
+    xml:Element|xml:Text x2 = xml `Hello World`;
+    value = x2[0];
+    assert(value, xml `Hello World`);
+    assertTrue(typeof value is typedesc<xml:Text>);
+    value = x2[0][1];
+    assert(value, xml ``);
+    assertTrue(typeof value is typedesc<xml:Text>);
+
+    xml:Element|xml:ProcessingInstruction x3 = xml `<?target data?>`;
+    value = x3[0];
+    assert(value, xml `<?target data?>`);
+    assertTrue(typeof value is typedesc<xml:ProcessingInstruction>);
+    value = x3[1][100];
+    assert(value, xml ``);
+    assertTrue(typeof value is typedesc<xml:Text>);
+
+    xml:Element|xml:Comment x4 = xml `<!-- comment node-->`;
+    value = x4[0];
+    assert(value, xml `<!-- comment node-->`);
+    assertTrue(typeof value is typedesc<xml:Comment>);
+    value = x4[10];
+    assert(value, xml ``);
+    assertTrue(typeof value is typedesc<xml:Text>);
+
+    xml:Text|xml:Comment x5 = xml `<!-- comment node 2 -->`;
+    value = x5[0];
+    assert(value, xml `<!-- comment node 2 -->`);
+    assertTrue(typeof value is typedesc<xml:Comment>);
+
+    xml:ProcessingInstruction|xml:Comment x6 = xml `<?target test?>`;
+    value = x6[0];
+    assert(value, xml `<?target test?>`);
+    assertTrue(typeof value is typedesc<xml:ProcessingInstruction>);
+
+    xml:ProcessingInstruction|xml:Text x7 = xml `Test Text`;
+    value = x7[0];
+    assert(value, xml `Test Text`);
+    assertTrue(typeof value is typedesc<xml:Text>);
+
+    xml|xml:Comment x8 = xml `<a>abc</a><b>def</b>`;
+    value = x8[0];
+    assert(value, xml `<a>abc</a>`);
+    assertTrue(typeof value is typedesc<xml:Element>);
+
+    xml|xml x9 = xml `<c>ghi</c><d>jkl</d>`;
+    value = x9[0];
+    assert(value, xml `<c>ghi</c>`);
+    assertTrue(typeof value is typedesc<xml:Element>);
+
+    xml<xml:Text|xml:Comment>|xml<xml:ProcessingInstruction|xml:Element> x10 = xml `<name>Dan Brown</name>`;
+    value = x10[0];
+    assert(value, xml `<name>Dan Brown</name>`);
+    assertTrue(typeof value is typedesc<xml:Element>);
+    value = x10[1];
+    assert(value, xml ``);
+    assertTrue(typeof value is typedesc<xml:Text>);
+
+    XmlType1 x11 = xml `Hello!`;
+    value = x11[0];
+    assert(value, xml `Hello!`);
+    assertTrue(typeof value is typedesc<xml:Text>);
+
+    XmlType2 x12 = xml `<name>Sherlock Holmes</name><work>Detective</work>`;
+    value = x12[0];
+    assert(value, xml `<name>Sherlock Holmes</name>`);
+    assertTrue(typeof value is typedesc<xml:Element>);
+    value = x12[1];
+    assert(value, xml `<work>Detective</work>`);
+    assertTrue(typeof value is typedesc<xml:Element>);
+
+    XmlType3 x13 = xml `<name>Sherlock Holmes</name>`;
+    value = x13[0];
+    assert(value, xml `<name>Sherlock Holmes</name>`);
+    assertTrue(typeof value is typedesc<xml:Element>);
+    value = x13[50][1];
+    assert(value, xml ``);
+    assertTrue(typeof value is typedesc<xml:Text>);
+}
+
+function testInvalidXMLUnionAccessWithNegativeIndex() {
+    int a = -1;
+    xml:Element|xml:Comment x1 = xml `<a>abc</a>`;
+    string errorMessage = "xml sequence index out of range. Length: '1' requested: '-1'";
+
+    xml|error e = trap x1[-1];
+    assertTrue(e is error);
+    assert((<error> e).message(), errorMessage);
+    e = trap x1[a];
+    assertTrue(e is error);
+    assert((<error> e).message(), errorMessage);
+    e = trap x1[i];
+    assertTrue(e is error);
+    assert((<error> e).message(), errorMessage);
+
+    xml<xml:Text|xml:Comment>|xml<xml:ProcessingInstruction|xml:Element> x2 = xml `<name>Dan Brown</name>`;
+    e = trap x2[-1];
+    assertTrue(e is error);
+    assert((<error> e).message(), errorMessage);
+    e = trap x2[a];
+    assertTrue(e is error);
+    assert((<error> e).message(), errorMessage);
+    e = trap x2[i];
+    assertTrue(e is error);
+    assert((<error> e).message(), errorMessage);
+
+    XmlType1 x3 = xml `Hello!`;
+    e = trap x3[-1];
+    assertTrue(e is error);
+    assert((<error> e).message(), errorMessage);
+    e = trap x3[a];
+    assertTrue(e is error);
+    assert((<error> e).message(), errorMessage);
+    e = trap x3[i];
+    assertTrue(e is error);
+    assert((<error> e).message(), errorMessage);
+
+    XmlType3 x4 = xml `<name>Sherlock Holmes</name>`;
+    e = trap x4[-1];
+    assertTrue(e is error);
+    assert((<error> e).message(), errorMessage);
+    e = trap x4[a];
+    assertTrue(e is error);
+    assert((<error> e).message(), errorMessage);
+    e = trap x4[i];
+    assertTrue(e is error);
+    assert((<error> e).message(), errorMessage);
+}
+
 function assert(anydata actual, anydata expected) {
     if (expected != actual) {
         typedesc<anydata> expT = typeof expected;