diff --git a/flang/lib/Optimizer/OpenACC/FIROpenACCTypeInterfaces.cpp b/flang/lib/Optimizer/OpenACC/FIROpenACCTypeInterfaces.cpp
index 673d7e86c7ba0..317a41a2129c3 100644
--- a/flang/lib/Optimizer/OpenACC/FIROpenACCTypeInterfaces.cpp
+++ b/flang/lib/Optimizer/OpenACC/FIROpenACCTypeInterfaces.cpp
@@ -306,6 +306,10 @@ static bool isArrayLike(mlir::Type type) {
 }
 
 static bool isCompositeLike(mlir::Type type) {
+  // class(*) is not a composite type since it does not have a determined type.
+  if (fir::isUnlimitedPolymorphicType(type))
+    return false;
+
   return mlir::isa<fir::RecordType, fir::ClassType, mlir::TupleType>(type);
 }
 
@@ -320,8 +324,18 @@ template <>
 mlir::acc::VariableTypeCategory
 OpenACCMappableModel<fir::BaseBoxType>::getTypeCategory(mlir::Type type,
                                                         mlir::Value var) const {
+  // Class-type does not behave like a normal box because it does not hold an
+  // element type. Thus special handle it here.
+  if (mlir::isa<fir::ClassType>(type)) {
+    // class(*) is not a composite type since it does not have a determined
+    // type.
+    if (fir::isUnlimitedPolymorphicType(type))
+      return mlir::acc::VariableTypeCategory::uncategorized;
+    return mlir::acc::VariableTypeCategory::composite;
+  }
 
   mlir::Type eleTy = fir::dyn_cast_ptrOrBoxEleTy(type);
+  assert(eleTy && "expect to be able to unwrap the element type");
 
   // If the type enclosed by the box is a mappable type, then have it
   // provide the type category.
@@ -346,7 +360,7 @@ OpenACCMappableModel<fir::BaseBoxType>::getTypeCategory(mlir::Type type,
   return mlir::acc::VariableTypeCategory::nonscalar;
 }
 
-static mlir::TypedValue<mlir::acc::PointerLikeType>
+static mlir::Value
 getBaseRef(mlir::TypedValue<mlir::acc::PointerLikeType> varPtr) {
   // If there is no defining op - the unwrapped reference is the base one.
   mlir::Operation *op = varPtr.getDefiningOp();
@@ -372,7 +386,7 @@ getBaseRef(mlir::TypedValue<mlir::acc::PointerLikeType> varPtr) {
           })
           .Default([&](mlir::Operation *) { return varPtr; });
 
-  return mlir::cast<mlir::TypedValue<mlir::acc::PointerLikeType>>(baseRef);
+  return baseRef;
 }
 
 static mlir::acc::VariableTypeCategory
@@ -384,10 +398,17 @@ categorizePointee(mlir::Type pointer,
   // value would both be represented as !fir.ref<f32>. We do not want to treat
   // such a reference as a scalar. Thus unwrap interior pointer calculations.
   auto baseRef = getBaseRef(varPtr);
-  mlir::Type eleTy = baseRef.getType().getElementType();
 
-  if (auto mappableTy = mlir::dyn_cast<mlir::acc::MappableType>(eleTy))
-    return mappableTy.getTypeCategory(varPtr);
+  if (auto mappableTy =
+          mlir::dyn_cast<mlir::acc::MappableType>(baseRef.getType()))
+    return mappableTy.getTypeCategory(baseRef);
+
+  // It must be a pointer-like type since it is not a MappableType.
+  auto ptrLikeTy = mlir::cast<mlir::acc::PointerLikeType>(baseRef.getType());
+  mlir::Type eleTy = ptrLikeTy.getElementType();
+
+  if (auto mappableEleTy = mlir::dyn_cast<mlir::acc::MappableType>(eleTy))
+    return mappableEleTy.getTypeCategory(varPtr);
 
   if (isScalarLike(eleTy))
     return mlir::acc::VariableTypeCategory::scalar;
@@ -397,8 +418,12 @@ categorizePointee(mlir::Type pointer,
     return mlir::acc::VariableTypeCategory::composite;
   if (mlir::isa<fir::CharacterType, mlir::FunctionType>(eleTy))
     return mlir::acc::VariableTypeCategory::nonscalar;
+  // Assumed-type (type(*))does not have a determined type that can be
+  // categorized.
+  if (mlir::isa<mlir::NoneType>(eleTy))
+    return mlir::acc::VariableTypeCategory::uncategorized;
   // "pointers" - in the sense of raw address point-of-view, are considered
-  // scalars. However
+  // scalars.
   if (mlir::isa<fir::LLVMPointerType>(eleTy))
     return mlir::acc::VariableTypeCategory::scalar;
 
diff --git a/flang/test/Fir/OpenACC/openacc-type-categories-class.f90 b/flang/test/Fir/OpenACC/openacc-type-categories-class.f90
new file mode 100644
index 0000000000000..58025bfa556a5
--- /dev/null
+++ b/flang/test/Fir/OpenACC/openacc-type-categories-class.f90
@@ -0,0 +1,46 @@
+! RUN: bbc -fopenacc -emit-hlfir %s -o - | fir-opt -pass-pipeline='builtin.module(test-fir-openacc-interfaces)' --mlir-disable-threading 2>&1 | FileCheck %s
+
+module mm
+  type, public :: polyty
+    real :: field
+  end type
+contains
+  subroutine init(this)
+    class(polyty), intent(inout) :: this
+    !$acc enter data copyin(this, this%field)
+  end subroutine
+  subroutine init_assumed_type(var)
+    type(*), intent(inout) :: var
+    !$acc enter data copyin(var)
+  end subroutine
+  subroutine init_unlimited(this)
+    class(*), intent(inout) :: this
+    !$acc enter data copyin(this)
+    select type(this)
+    type is(real)
+      !$acc enter data copyin(this)
+    class is(polyty)
+      !$acc enter data copyin(this, this%field)
+    end select
+  end subroutine
+end module
+
+! CHECK: Visiting: {{.*}} acc.copyin {{.*}} {name = "this", structured = false}
+! CHECK: Mappable: !fir.class<!fir.type<_QMmmTpolyty{field:f32}>>
+! CHECK: Type category: composite
+! CHECK: Visiting: {{.*}} acc.copyin {{.*}} {name = "this%field", structured = false}
+! CHECK: Pointer-like: !fir.ref<f32>
+! CHECK: Type category: composite
+
+! For unlimited polymorphic entities and assumed types - they effectively have
+! no declared type. Thus the type categorizer cannot categorize it.
+! CHECK: Visiting: {{.*}} = acc.copyin {{.*}} {name = "var", structured = false}
+! CHECK: Pointer-like: !fir.ref<none>
+! CHECK: Type category: uncategorized
+! CHECK: Visiting: {{.*}} = acc.copyin {{.*}} {name = "this", structured = false}
+! CHECK: Mappable: !fir.class<none>
+! CHECK: Type category: uncategorized
+
+! TODO: After using select type - the appropriate type category should be
+! possible. Add the rest of the test once OpenACC lowering correctly handles
+! unlimited polymorhic.
diff --git a/flang/test/lib/OpenACC/TestOpenACCInterfaces.cpp b/flang/test/lib/OpenACC/TestOpenACCInterfaces.cpp
index 90aabd7d40d44..e72b96fe7cd10 100644
--- a/flang/test/lib/OpenACC/TestOpenACCInterfaces.cpp
+++ b/flang/test/lib/OpenACC/TestOpenACCInterfaces.cpp
@@ -6,11 +6,15 @@
 //
 //===----------------------------------------------------------------------===//
 
+#include "mlir/Dialect/Arith/IR/Arith.h"
+#include "mlir/Dialect/DLTI/DLTI.h"
 #include "mlir/Dialect/OpenACC/OpenACC.h"
 #include "mlir/IR/Builders.h"
 #include "mlir/IR/BuiltinOps.h"
 #include "mlir/Pass/Pass.h"
 #include "mlir/Support/LLVM.h"
+#include "flang/Optimizer/Dialect/FIRDialect.h"
+#include "flang/Optimizer/HLFIR/HLFIRDialect.h"
 #include "flang/Optimizer/Support/DataLayout.h"
 
 using namespace mlir;
@@ -25,6 +29,11 @@ struct TestFIROpenACCInterfaces
   StringRef getDescription() const final {
     return "Test FIR implementation of the OpenACC interfaces.";
   }
+  void getDependentDialects(::mlir::DialectRegistry &registry) const override {
+    registry.insert<fir::FIROpsDialect, hlfir::hlfirDialect,
+        mlir::arith::ArithDialect, mlir::acc::OpenACCDialect,
+        mlir::DLTIDialect>();
+  }
   void runOnOperation() override {
     mlir::ModuleOp mod = getOperation();
     auto datalayout =