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diff --git a/Marlin/src/gcode/bedlevel/mbl/M421.cpp b/Marlin/src/gcode/bedlevel/mbl/M421.cpp
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+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+
+/**
+ * M421.cpp - Mesh Bed Leveling
+ */
+
+#include "../../../inc/MarlinConfig.h"
+
+#if ENABLED(MESH_BED_LEVELING)
+
+#include "../../gcode.h"
+#include "../../../module/motion.h"
+#include "../../../feature/bedlevel/mbl/mesh_bed_leveling.h"
+
+/**
+ * M421: Set a single Mesh Bed Leveling Z coordinate
+ *
+ * Usage:
+ *   M421 X<linear> Y<linear> Z<linear>
+ *   M421 X<linear> Y<linear> Q<offset>
+ *   M421 I<xindex> J<yindex> Z<linear>
+ *   M421 I<xindex> J<yindex> Q<offset>
+ */
+void GcodeSuite::M421() {
+  const bool hasX = parser.seen('X'), hasI = parser.seen('I');
+  const int8_t ix = hasI ? parser.value_int() : hasX ? mbl.probe_index_x(RAW_X_POSITION(parser.value_linear_units())) : -1;
+  const bool hasY = parser.seen('Y'), hasJ = parser.seen('J');
+  const int8_t iy = hasJ ? parser.value_int() : hasY ? mbl.probe_index_y(RAW_Y_POSITION(parser.value_linear_units())) : -1;
+  const bool hasZ = parser.seen('Z'), hasQ = !hasZ && parser.seen('Q');
+
+  if (int(hasI && hasJ) + int(hasX && hasY) != 1 || !(hasZ || hasQ))
+    SERIAL_ERROR_MSG(STR_ERR_M421_PARAMETERS);
+  else if (ix < 0 || iy < 0)
+    SERIAL_ERROR_MSG(STR_ERR_MESH_XY);
+  else
+    mbl.set_z(ix, iy, parser.value_linear_units() + (hasQ ? mbl.z_values[ix][iy] : 0));
+}
+
+#endif // MESH_BED_LEVELING