diff --git a/package-lock.json b/package-lock.json
index a85cd32..5ebf323 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "codice-fiscale-js",
-  "version": "2.3.6",
+  "version": "2.3.7",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/src/codice-fiscale.js b/src/codice-fiscale.js
index bc4544a..c1aec4d 100755
--- a/src/codice-fiscale.js
+++ b/src/codice-fiscale.js
@@ -83,6 +83,9 @@ class CodiceFiscale {
     if (cf.length !== 16) {
       return false
     }
+    if(! /^[A-Z]{6}[0-9LMNPQRSTUV]{2}[ABCDEHLMPRST]{1}[0-9LMNPQRSTUV]{2}[A-Z]{1}[0-9LMNPQRSTUV]{3}[A-Z]{1}$/.test(cf)){
+      return false;
+    }
     const expectedCheckCode = codiceFiscale.charAt(15)
     cf = codiceFiscale.slice(0, 15)
     return CodiceFiscale.getCheckCode(cf).toUpperCase() === expectedCheckCode.toUpperCase();
diff --git a/tests/index.spec.js b/tests/index.spec.js
index 551ee12..e0a5585 100755
--- a/tests/index.spec.js
+++ b/tests/index.spec.js
@@ -442,4 +442,9 @@ describe("La classe Comune", ()=>{
     expect(bz.nome).toEqual('BOLZANO')
 
   })
-})
\ No newline at end of file
+})
+
+let invalidCfis =  "BLIPTR93MO4A674Q";
+test('check invalid cfis by regex control', () => {
+  expect(CodiceFiscale.check(invalidCfis)).toEqual(false);
+});
\ No newline at end of file