diff --git a/packages/devextreme/js/ui/number_box/number_box.mask.js b/packages/devextreme/js/ui/number_box/number_box.mask.js
index ae910d15a5a6..ef5675f11973 100644
--- a/packages/devextreme/js/ui/number_box/number_box.mask.js
+++ b/packages/devextreme/js/ui/number_box/number_box.mask.js
@@ -404,13 +404,20 @@ const NumberBoxMask = NumberBoxBase.inherit({
     },
 
     _tryParse: function(text, selection, char) {
+        const isTextSelected = selection.start !== selection.end;
+        const isWholeTextSelected = isTextSelected && selection.start === 0 && selection.end === text.length;
+        const decimalSeparator = number.getDecimalSeparator();
+
+        if(isWholeTextSelected && char === decimalSeparator) {
+            return 0;
+        }
+
         const editedText = this._replaceSelectedText(text, selection, char);
         const format = this._getFormatPattern();
-        const isTextSelected = selection.start !== selection.end;
+
         let parsedValue = this._getParsedValue(editedText, format);
         const maxPrecision = !format.parser && this._getPrecisionLimits(editedText).max;
         const isValueChanged = parsedValue !== this._parsedValue;
-        const decimalSeparator = number.getDecimalSeparator();
 
         const isDecimalPointRestricted = char === decimalSeparator && maxPrecision === 0;
         const isUselessCharRestricted = !isTextSelected && !isValueChanged && char !== MINUS && !this._isValueIncomplete(editedText) && this._isStub(char);
diff --git a/packages/devextreme/testing/tests/DevExpress.ui.widgets.editors/numberBoxParts/mask.tests.js b/packages/devextreme/testing/tests/DevExpress.ui.widgets.editors/numberBoxParts/mask.tests.js
index a987777a1b2b..8a72f8d80c14 100644
--- a/packages/devextreme/testing/tests/DevExpress.ui.widgets.editors/numberBoxParts/mask.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.ui.widgets.editors/numberBoxParts/mask.tests.js
@@ -665,6 +665,19 @@ QUnit.module('format: fixed point format', moduleConfig, () => {
 
         assert.strictEqual(this.instance.option('text'), '4.65');
     });
+
+    QUnit.test('pressing "." should clear selected text if it contains a decimal separator (T1199553)', function(assert) {
+        this.instance.option({
+            format: '0#.00',
+            value: 123.45
+        });
+
+        this.keyboard
+            .caret({ start: 0, end: 6 })
+            .type('.');
+
+        assert.strictEqual(this.input.val(), '0.00', 'mask value is cleared');
+    });
 });
 
 QUnit.module('format: minimum and maximum', moduleConfig, () => {