diff --git a/src/CONST.ts b/src/CONST.ts
index 709e9d3bafe2..b43d75e5cb80 100755
--- a/src/CONST.ts
+++ b/src/CONST.ts
@@ -218,9 +218,8 @@ const CONST = {
         REGEX: {
             US_ACCOUNT_NUMBER: /^[0-9]{4,17}$/,
 
-            // If the account number length is from 4 to 13 digits, we show the last 4 digits and hide the rest with X
-            // If the length is longer than 13 digits, we show the first 6 and last 4 digits, hiding the rest with X
-            MASKED_US_ACCOUNT_NUMBER: /^[X]{0,9}[0-9]{4}$|^[0-9]{6}[X]{4,7}[0-9]{4}$/,
+            // The back-end is always returning account number with 4 last digits and mask the rest with X
+            MASKED_US_ACCOUNT_NUMBER: /^[X]{0,13}[0-9]{4}$/,
             SWIFT_BIC: /^[A-Za-z0-9]{8,11}$/,
         },
         VERIFICATION_MAX_ATTEMPTS: 7,
diff --git a/src/pages/ReimbursementAccount/BankAccountManualStep.js b/src/pages/ReimbursementAccount/BankAccountManualStep.js
index dd541c68ecf4..b46d3aa0aa28 100644
--- a/src/pages/ReimbursementAccount/BankAccountManualStep.js
+++ b/src/pages/ReimbursementAccount/BankAccountManualStep.js
@@ -28,6 +28,9 @@ function BankAccountManualStep(props) {
     const styles = useThemeStyles();
     const {translate, preferredLocale} = useLocalize();
     const {reimbursementAccount, reimbursementAccountDraft} = props;
+
+    const shouldDisableInputs = Boolean(lodashGet(reimbursementAccount, 'achData.bankAccountID'));
+
     /**
      * @param {Object} values - form input values passed by the Form component
      * @returns {Object}
@@ -41,7 +44,7 @@ function BankAccountManualStep(props) {
             if (
                 values.accountNumber &&
                 !CONST.BANK_ACCOUNT.REGEX.US_ACCOUNT_NUMBER.test(values.accountNumber.trim()) &&
-                !CONST.BANK_ACCOUNT.REGEX.MASKED_US_ACCOUNT_NUMBER.test(values.accountNumber.trim())
+                !(shouldDisableInputs && CONST.BANK_ACCOUNT.REGEX.MASKED_US_ACCOUNT_NUMBER.test(values.accountNumber.trim()))
             ) {
                 errors.accountNumber = 'bankAccount.error.accountNumber';
             } else if (values.accountNumber && values.accountNumber === routingNumber) {
@@ -56,7 +59,7 @@ function BankAccountManualStep(props) {
 
             return errors;
         },
-        [translate],
+        [translate, shouldDisableInputs],
     );
 
     const submit = useCallback(
@@ -71,8 +74,6 @@ function BankAccountManualStep(props) {
         [reimbursementAccount, reimbursementAccountDraft],
     );
 
-    const shouldDisableInputs = Boolean(lodashGet(reimbursementAccount, 'achData.bankAccountID'));
-
     return (
         <ScreenWrapper
             includeSafeAreaPaddingBottom={false}