diff --git a/src/DgiiRncValidator.php b/src/DgiiRncValidator.php
index e3c923c..4ad0c2b 100755
--- a/src/DgiiRncValidator.php
+++ b/src/DgiiRncValidator.php
@@ -21,10 +21,10 @@ public static function validateRNC(string $string): bool
         return (bool) count($matches);
     }
 
-    public static function rncType(string $string): bool|string
+    public static function rncType(string $string): bool|Types
     {
         if (self::validateRNC($string)) {
-            return (strlen($string) === 9) ? Types::RNC->toString() : Types::CEDULA->toString();
+            return (strlen($string) === 9) ? Types::RNC : Types::CEDULA;
         }
 
         return false;
diff --git a/src/helpers/Types.php b/src/helpers/Types.php
index 70b58c7..1aae322 100644
--- a/src/helpers/Types.php
+++ b/src/helpers/Types.php
@@ -18,4 +18,13 @@ public function toString(): string
             self::PASSPORT => 'PASSPORT',
         };
     }
+
+    public function toCode(): string
+    {
+        return match ($this) {
+            self::RNC => '01',
+            self::CEDULA => '02',
+            self::PASSPORT => '03',
+        };
+    }
 }
diff --git a/tests/DgiiRncValidatorTest.php b/tests/DgiiRncValidatorTest.php
index 4747224..1121fd1 100644
--- a/tests/DgiiRncValidatorTest.php
+++ b/tests/DgiiRncValidatorTest.php
@@ -1,6 +1,7 @@
 <?php
 
 use Seisigma\DgiiRncValidator\DgiiRncValidator;
+use Seisigma\DgiiRncValidator\helpers\Types;
 
 test('check if the given string is a valid RNC', function () {
     expect(DgiiRncValidator::validateRNC('123'))->toBeFalse()
@@ -10,8 +11,8 @@
 });
 
 test('check rncType return the type name', function () {
-    expect(DgiiRncValidator::rncType('123456789'))->toBe('RNC')
-        ->and(DgiiRncValidator::rncType('12345678901'))->toBe('CEDULA');
+    expect(DgiiRncValidator::rncType('123456789'))->toBe(Types::RNC)
+        ->and(DgiiRncValidator::rncType('12345678901'))->toBe(Types::CEDULA);
 });
 
 it('can return the details of an RNC if true', function () {