diff --git a/index.d.ts b/index.d.ts
index ff40c1963aa..50ba645b3fc 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -603,8 +603,8 @@ declare module 'mongoose' {
 
   interface AcceptsDiscriminator {
     /** Adds a discriminator type. */
-    discriminator<D extends Document>(name: string | number, schema: Schema<D>, value?: string): Model<D>;
-    discriminator<T extends Document, U extends Model<T>>(name: string | number, schema: Schema<T, U>, value?: string): U;
+    discriminator<D extends Document>(name: string | number, schema: Schema<D>, value?: string | number | ObjectId): Model<D>;
+    discriminator<T extends Document, U extends Model<T>>(name: string | number, schema: Schema<T, U>, value?: string | number | ObjectId): U;
   }
 
   interface AnyObject { [k: string]: any }
diff --git a/lib/helpers/discriminator/areDiscriminatorValuesEqual.js b/lib/helpers/discriminator/areDiscriminatorValuesEqual.js
new file mode 100644
index 00000000000..87b2408e6db
--- /dev/null
+++ b/lib/helpers/discriminator/areDiscriminatorValuesEqual.js
@@ -0,0 +1,16 @@
+'use strict';
+
+const ObjectId = require('../../types/objectid');
+
+module.exports = function areDiscriminatorValuesEqual(a, b) {
+  if (typeof a === 'string' && typeof b === 'string') {
+    return a === b;
+  }
+  if (typeof a === 'number' && typeof b === 'number') {
+    return a === b;
+  }
+  if (a instanceof ObjectId && b instanceof ObjectId) {
+    return a.toString() === b.toString();
+  }
+  return false;
+};
\ No newline at end of file
diff --git a/lib/helpers/discriminator/getDiscriminatorByValue.js b/lib/helpers/discriminator/getDiscriminatorByValue.js
index a107a910492..741fb8cd02f 100644
--- a/lib/helpers/discriminator/getDiscriminatorByValue.js
+++ b/lib/helpers/discriminator/getDiscriminatorByValue.js
@@ -1,5 +1,7 @@
 'use strict';
 
+const areDiscriminatorValuesEqual = require('./areDiscriminatorValuesEqual');
+
 /*!
 * returns discriminator by discriminatorMapping.value
 *
@@ -8,20 +10,18 @@
 */
 
 module.exports = function getDiscriminatorByValue(model, value) {
-  let discriminator = null;
   if (!model.discriminators) {
-    return discriminator;
+    return null;
   }
   for (const name in model.discriminators) {
     const it = model.discriminators[name];
     if (
       it.schema &&
       it.schema.discriminatorMapping &&
-      it.schema.discriminatorMapping.value == value
+      areDiscriminatorValuesEqual(it.schema.discriminatorMapping.value, value)
     ) {
-      discriminator = it;
-      break;
+      return it;
     }
   }
-  return discriminator;
+  return null;
 };
\ No newline at end of file
diff --git a/lib/helpers/discriminator/getSchemaDiscriminatorByValue.js b/lib/helpers/discriminator/getSchemaDiscriminatorByValue.js
index f3e71a093a9..b29fb6521e1 100644
--- a/lib/helpers/discriminator/getSchemaDiscriminatorByValue.js
+++ b/lib/helpers/discriminator/getSchemaDiscriminatorByValue.js
@@ -1,5 +1,7 @@
 'use strict';
 
+const areDiscriminatorValuesEqual = require('./areDiscriminatorValuesEqual');
+
 /*!
 * returns discriminator by discriminatorMapping.value
 *
@@ -16,7 +18,7 @@ module.exports = function getSchemaDiscriminatorByValue(schema, value) {
     if (discriminatorSchema.discriminatorMapping == null) {
       continue;
     }
-    if (discriminatorSchema.discriminatorMapping.value === value) {
+    if (areDiscriminatorValuesEqual(discriminatorSchema.discriminatorMapping.value, value)) {
       return discriminatorSchema;
     }
   }
diff --git a/lib/helpers/model/discriminator.js b/lib/helpers/model/discriminator.js
index 2ad4c5e3754..455d17de2f9 100644
--- a/lib/helpers/model/discriminator.js
+++ b/lib/helpers/model/discriminator.js
@@ -1,6 +1,7 @@
 'use strict';
 
 const Mixed = require('../../schema/mixed');
+const ObjectId = require('../../types/objectid');
 const defineKey = require('../document/compile').defineKey;
 const get = require('../get');
 const utils = require('../../utils');
@@ -63,7 +64,9 @@ module.exports = function discriminator(model, name, schema, tiedValue, applyPlu
   }
 
   let value = name;
-  if (typeof tiedValue == 'string' && tiedValue.length) {
+  if ((typeof tiedValue === 'string' && tiedValue.length) ||
+      typeof tiedValue === 'number' ||
+      tiedValue instanceof ObjectId) {
     value = tiedValue;
   }
 
diff --git a/test/model.discriminator.test.js b/test/model.discriminator.test.js
index 2465826fbe6..18ea0f91317 100644
--- a/test/model.discriminator.test.js
+++ b/test/model.discriminator.test.js
@@ -1094,6 +1094,35 @@ describe('model', function() {
         });
     });
 
+    it('supports ObjectId as tied value (gh-10130)', function() {
+      const eventSchema = new Schema({ message: String, kind: 'ObjectId' },
+        { discriminatorKey: 'kind' });
+
+      const Event = db.model('Event', eventSchema);
+      const clickedId = new mongoose.Types.ObjectId();
+      const purchasedId = new mongoose.Types.ObjectId();
+      Event.discriminator('Clicked', new Schema({
+        element: String
+      }), clickedId);
+      Event.discriminator('Purchased', new Schema({
+        product: String
+      }), purchasedId);
+
+      return co(function*() {
+        yield Event.create([
+          { message: 'test', element: '#buy', kind: clickedId },
+          { message: 'test2', product: 'Turbo Man', kind: purchasedId }
+        ]);
+
+        const docs = yield Event.find().sort({ message: 1 });
+        assert.equal(docs.length, 2);
+        assert.equal(docs[0].kind.toHexString(), clickedId.toHexString());
+        assert.equal(docs[0].element, '#buy');
+        assert.equal(docs[1].kind.toHexString(), purchasedId.toHexString());
+        assert.equal(docs[1].product, 'Turbo Man');
+      });
+    });
+
     it('Embedded discriminators in nested doc arrays (gh-6202)', function() {
       const eventSchema = new Schema({ message: String }, {
         discriminatorKey: 'kind',