diff --git a/types/mongodb/index.d.ts b/types/mongodb/index.d.ts
index 6f43aa22c9..6f372ba084 100644
--- a/types/mongodb/index.d.ts
+++ b/types/mongodb/index.d.ts
@@ -32,7 +32,7 @@
 
 /// <reference types="node" />
 
-import { Binary, ObjectID, Timestamp } from 'bson';
+import { Binary, ObjectId, Timestamp } from 'bson';
 import { EventEmitter } from 'events';
 import { Readable, Writable } from "stream";
 import { checkServerIdentity } from "tls";
@@ -857,6 +857,15 @@ export interface FSyncOptions extends CommonOptions {
 
 type OptionalId<TSchema> = Omit<TSchema, '_id'> & { _id?: any };
 
+type ExtractIdType<TSchema> =
+    TSchema extends { _id: infer U } // user has defined a type for _id
+    ? ({} extends U ? Exclude<U, {}> : U) // Exclude is used here to fix typescript 2 bug when TSchema is "any"
+    : ObjectId; // user has not defined _id on schema
+
+// this adds _id as required property
+type WithId<TSchema> =
+    Omit<TSchema, '_id'> & { _id: ExtractIdType<TSchema> };
+
 /** http://mongodb.github.io/node-mongodb-native/3.1/api/Collection.html */
 export interface Collection<TSchema = Default> {
     /**
@@ -1005,19 +1014,19 @@ export interface Collection<TSchema = Default> {
     initializeUnorderedBulkOp(options?: CommonOptions): UnorderedBulkOperation;
     /** http://mongodb.github.io/node-mongodb-native/3.1/api/Collection.html#insertOne */
     /** @deprecated Use insertOne, insertMany or bulkWrite */
-    insert(docs: OptionalId<TSchema>, callback: MongoCallback<InsertOneWriteOpResult>): void;
+    insert(docs: OptionalId<TSchema>, callback: MongoCallback<InsertWriteOpResult<WithId<TSchema>>>): void;
     /** @deprecated Use insertOne, insertMany or bulkWrite */
-    insert(docs: OptionalId<TSchema>, options?: CollectionInsertOneOptions): Promise<InsertOneWriteOpResult>;
+    insert(docs: OptionalId<TSchema>, options?: CollectionInsertOneOptions): Promise<InsertWriteOpResult<WithId<TSchema>>>;
     /** @deprecated Use insertOne, insertMany or bulkWrite */
-    insert(docs: OptionalId<TSchema>, options: CollectionInsertOneOptions, callback: MongoCallback<InsertOneWriteOpResult>): void;
+    insert(docs: OptionalId<TSchema>, options: CollectionInsertOneOptions, callback: MongoCallback<InsertWriteOpResult<WithId<TSchema>>>): void;
     /** http://mongodb.github.io/node-mongodb-native/3.1/api/Collection.html#insertMany */
-    insertMany(docs: Array<OptionalId<TSchema>>, callback: MongoCallback<InsertWriteOpResult>): void;
-    insertMany(docs: Array<OptionalId<TSchema>>, options?: CollectionInsertManyOptions): Promise<InsertWriteOpResult>;
-    insertMany(docs: Array<OptionalId<TSchema>>, options: CollectionInsertManyOptions, callback: MongoCallback<InsertWriteOpResult>): void;
+    insertMany(docs: Array<OptionalId<TSchema>>, callback: MongoCallback<InsertWriteOpResult<WithId<TSchema>>>): void;
+    insertMany(docs: Array<OptionalId<TSchema>>, options?: CollectionInsertManyOptions): Promise<InsertWriteOpResult<WithId<TSchema>>>;
+    insertMany(docs: Array<OptionalId<TSchema>>, options: CollectionInsertManyOptions, callback: MongoCallback<InsertWriteOpResult<WithId<TSchema>>>): void;
     /** http://mongodb.github.io/node-mongodb-native/3.1/api/Collection.html#insertOne */
-    insertOne(docs: OptionalId<TSchema>, callback: MongoCallback<InsertOneWriteOpResult>): void;
-    insertOne(docs: OptionalId<TSchema>, options?: CollectionInsertOneOptions): Promise<InsertOneWriteOpResult>;
-    insertOne(docs: OptionalId<TSchema>, options: CollectionInsertOneOptions, callback: MongoCallback<InsertOneWriteOpResult>): void;
+    insertOne(docs: OptionalId<TSchema>, callback: MongoCallback<InsertOneWriteOpResult<WithId<TSchema>>>): void;
+    insertOne(docs: OptionalId<TSchema>, options?: CollectionInsertOneOptions): Promise<InsertOneWriteOpResult<WithId<TSchema>>>;
+    insertOne(docs: OptionalId<TSchema>, options: CollectionInsertOneOptions, callback: MongoCallback<InsertOneWriteOpResult<WithId<TSchema>>>): void;
     /** http://mongodb.github.io/node-mongodb-native/3.1/api/Collection.html#isCapped */
     isCapped(options?: { session: ClientSession }): Promise<any>;
     isCapped(callback: MongoCallback<any>): void;
@@ -1730,10 +1739,10 @@ export interface FindOneOptions {
 }
 
 /** http://mongodb.github.io/node-mongodb-native/3.1/api/Collection.html#~insertWriteOpResult */
-export interface InsertWriteOpResult {
+export interface InsertWriteOpResult<TSchema extends Record<string, any>> {
     insertedCount: number;
-    ops: any[];
-    insertedIds: { [key: number]: ObjectID };
+    ops: TSchema[];
+    insertedIds: { [key: number]: TSchema['_id'] };
     connection: any;
     result: { ok: number, n: number };
 }
@@ -1751,10 +1760,10 @@ export interface CollectionInsertOneOptions extends CommonOptions {
 }
 
 /** http://mongodb.github.io/node-mongodb-native/3.1/api/Collection.html#~insertOneWriteOpResult */
-export interface InsertOneWriteOpResult {
+export interface InsertOneWriteOpResult<TSchema extends Record<string, any>> {
     insertedCount: number;
-    ops: any[];
-    insertedId: ObjectID;
+    ops: TSchema[];
+    insertedId: TSchema['_id'];
     connection: any;
     result: { ok: number, n: number };
 }
@@ -1792,7 +1801,7 @@ export interface UpdateWriteOpResult {
     matchedCount: number;
     modifiedCount: number;
     upsertedCount: number;
-    upsertedId: { _id: ObjectID };
+    upsertedId: { _id: ObjectId };
 }
 
 /** https://github.com/mongodb/node-mongodb-native/blob/2.2/lib/collection.js#L957 */
@@ -2037,13 +2046,13 @@ export class CommandCursor extends Readable {
 export class GridFSBucket {
     constructor(db: Db, options?: GridFSBucketOptions);
     /** http://mongodb.github.io/node-mongodb-native/3.1/api/GridFSBucket.html#delete */
-    delete(id: ObjectID, callback?: GridFSBucketErrorCallback): void;
+    delete(id: ObjectId, callback?: GridFSBucketErrorCallback): void;
     /** http://mongodb.github.io/node-mongodb-native/3.1/api/GridFSBucket.html#drop */
     drop(callback?: GridFSBucketErrorCallback): void;
     /** http://mongodb.github.io/node-mongodb-native/3.1/api/GridFSBucket.html#find */
     find(filter?: object, options?: GridFSBucketFindOptions): Cursor<any>;
     /** http://mongodb.github.io/node-mongodb-native/3.1/api/GridFSBucket.html#openDownloadStream */
-    openDownloadStream(id: ObjectID, options?: { start: number, end: number }): GridFSBucketReadStream;
+    openDownloadStream(id: ObjectId, options?: { start: number, end: number }): GridFSBucketReadStream;
     /** http://mongodb.github.io/node-mongodb-native/3.1/api/GridFSBucket.html#openDownloadStreamByName */
     openDownloadStreamByName(filename: string, options?: { revision: number, start: number, end: number }): GridFSBucketReadStream;
     /** http://mongodb.github.io/node-mongodb-native/3.1/api/GridFSBucket.html#openUploadStream */
@@ -2051,7 +2060,7 @@ export class GridFSBucket {
     /** http://mongodb.github.io/node-mongodb-native/3.1/api/GridFSBucket.html#openUploadStreamWithId */
     openUploadStreamWithId(id: GridFSBucketWriteStreamId, filename: string, options?: GridFSBucketOpenUploadStreamOptions): GridFSBucketWriteStream;
     /** http://mongodb.github.io/node-mongodb-native/3.1/api/GridFSBucket.html#rename */
-    rename(id: ObjectID, filename: string, callback?: GridFSBucketErrorCallback): void;
+    rename(id: ObjectId, filename: string, callback?: GridFSBucketErrorCallback): void;
 }
 
 /** http://mongodb.github.io/node-mongodb-native/3.1/api/GridFSBucket.html */
@@ -2087,7 +2096,7 @@ export interface GridFSBucketOpenUploadStreamOptions {
 
 /** https://mongodb.github.io/node-mongodb-native/3.1/api/GridFSBucketReadStream.html */
 export class GridFSBucketReadStream extends Readable {
-    id: ObjectID;
+    id: ObjectId;
     constructor(chunks: Collection<any>, files: Collection<any>, readPreference: object, filter: object, options?: GridFSBucketReadStreamOptions);
 }
 
@@ -2154,7 +2163,7 @@ export interface ChangeStreamOptions {
     startAfter?: object;
 }
 
-type GridFSBucketWriteStreamId = string | number | object | ObjectID;
+type GridFSBucketWriteStreamId = string | number | object | ObjectId;
 
 export interface LoggerOptions {
     /**
diff --git a/types/mongodb/test/collection/insertX.ts b/types/mongodb/test/collection/insertX.ts
index fe70ccc092..bb4f6e8f21 100644
--- a/types/mongodb/test/collection/insertX.ts
+++ b/types/mongodb/test/collection/insertX.ts
@@ -1,5 +1,6 @@
 import { connect } from 'mongodb';
 import { connectionString } from '../index';
+import { ObjectId } from 'bson';
 
 // test collection.insertX functions
 async function run() {
@@ -20,13 +21,45 @@ async function run() {
     numberField?: number;
     fruitTags: string[];
   }
+  type TestModelWithId = TestModel & { _id: ObjectId; };
   const collection = db.collection<TestModel>('testCollection');
-  collection.insertOne({
+  const result = await collection.insert({
     stringField: 'hola',
     fruitTags: ['Strawberry'],
   });
-  collection.insertMany([
+  const resultOne = await collection.insertOne({
+    stringField: 'hola',
+    fruitTags: ['Strawberry'],
+  });
+  const resultMany = await collection.insertMany([
     { stringField: 'hola', fruitTags: ['Apple', 'Lemon'] },
     { stringField: 'hola', numberField: 1, fruitTags: [] },
   ]);
+
+  // test results type
+  // should add a _id field with ObjectId type if it does not exist on collection type
+  result.ops[0]._id;   // $ExpectType ObjectId
+  resultMany.ops[0]._id;  // $ExpectType ObjectId
+  resultOne.ops[0]._id;   // $ExpectType ObjectId
+  result.insertedIds;     // $ExpectType { [key: number]: ObjectId; }
+  resultMany.insertedIds; // $ExpectType { [key: number]: ObjectId; }
+  resultOne.insertedId;   // $ExpectType ObjectId
+
+  // should add a _id field with user specified type
+  type TestModelWithCustomId = TestModel & { _id: number; };
+  const collectionWithId = db.collection<TestModelWithCustomId>('testCollection');
+
+  const resultOneWithId = await collectionWithId.insertOne({
+    stringField: 'hola',
+    fruitTags: ['Strawberry'],
+  });
+  const resultManyWithId = await collectionWithId.insertMany([
+    { stringField: 'hola', fruitTags: ['Apple', 'Lemon'] },
+    { stringField: 'hola', numberField: 1, fruitTags: [] },
+  ]);
+
+  resultOneWithId.ops[0]._id;    // $ExpectType number
+  resultOneWithId.insertedId;    // $ExpectType number
+  resultManyWithId.ops[0]._id;   // $ExpectType number
+  resultManyWithId.insertedIds;  // $ExpectType { [key: number]: number; }
 }