diff --git a/conf/config.neon b/conf/config.neon
index 7f494ce35b..0b8b0ca3d3 100644
--- a/conf/config.neon
+++ b/conf/config.neon
@@ -1268,6 +1268,11 @@ services:
 		tags:
 			- phpstan.broker.dynamicFunctionReturnTypeExtension
 
+	-
+		class: PHPStan\Type\Php\ThrowableReturnTypeExtension
+		tags:
+			- phpstan.broker.dynamicMethodReturnTypeExtension
+
 	-
 		class: PHPStan\Type\Php\ParseUrlFunctionDynamicReturnTypeExtension
 		tags:
diff --git a/src/Type/Php/ThrowableReturnTypeExtension.php b/src/Type/Php/ThrowableReturnTypeExtension.php
new file mode 100644
index 0000000000..3fc33738a0
--- /dev/null
+++ b/src/Type/Php/ThrowableReturnTypeExtension.php
@@ -0,0 +1,31 @@
+<?php declare(strict_types = 1);
+
+namespace PHPStan\Type\Php;
+
+use PhpParser\Node\Expr\MethodCall;
+use PHPStan\Analyser\Scope;
+use PHPStan\Reflection\MethodReflection;
+use PHPStan\Type\BenevolentUnionType;
+use PHPStan\Type\IntegerType;
+use PHPStan\Type\StringType;
+use PHPStan\Type\Type;
+
+final class ThrowableReturnTypeExtension implements \PHPStan\Type\DynamicMethodReturnTypeExtension
+{
+
+	public function getClass(): string
+	{
+		return \Throwable::class;
+	}
+
+	public function isMethodSupported(MethodReflection $methodReflection): bool
+	{
+		return $methodReflection->getName() === 'getCode';
+	}
+
+	public function getTypeFromMethodCall(MethodReflection $methodReflection, MethodCall $methodCall, Scope $scope): Type
+	{
+		return new BenevolentUnionType([new IntegerType(), new StringType()]);
+	}
+
+}
diff --git a/tests/PHPStan/Analyser/NodeScopeResolverTest.php b/tests/PHPStan/Analyser/NodeScopeResolverTest.php
index e9ffac52e5..475ed7d688 100644
--- a/tests/PHPStan/Analyser/NodeScopeResolverTest.php
+++ b/tests/PHPStan/Analyser/NodeScopeResolverTest.php
@@ -530,6 +530,7 @@ public function dataFileAsserts(): iterable
 		yield from $this->gatherAssertTypes(__DIR__ . '/data/bug-4743.php');
 		yield from $this->gatherAssertTypes(__DIR__ . '/data/bug-5017.php');
 		yield from $this->gatherAssertTypes(__DIR__ . '/data/bug-5992.php');
+		yield from $this->gatherAssertTypes(__DIR__ . '/data/bug-6001.php');
 
 		if (PHP_VERSION_ID >= 70400) {
 			yield from $this->gatherAssertTypes(__DIR__ . '/data/bug-5458.php');
diff --git a/tests/PHPStan/Analyser/data/bug-6001.php b/tests/PHPStan/Analyser/data/bug-6001.php
new file mode 100644
index 0000000000..0e950940cd
--- /dev/null
+++ b/tests/PHPStan/Analyser/data/bug-6001.php
@@ -0,0 +1,11 @@
+<?php declare(strict_types=1);
+
+namespace Bug6001;
+
+use function PHPStan\Testing\assertType;
+
+assertType('(int|string)', (new \Exception())->getCode());
+
+assertType('(int|string)', (new \RuntimeException())->getCode());
+
+assertType('(int|string)', (new \PDOException())->getCode());
diff --git a/tests/PHPStan/Analyser/data/generics.php b/tests/PHPStan/Analyser/data/generics.php
index 032fa71f17..f35120282e 100644
--- a/tests/PHPStan/Analyser/data/generics.php
+++ b/tests/PHPStan/Analyser/data/generics.php
@@ -1400,7 +1400,7 @@ public function process($class): void {
 }
 
 function (\Throwable $e): void {
-	assertType('mixed', $e->getCode());
+	assertType('(int|string)', $e->getCode());
 };
 
 function (): void {