What Is Quest Diagnostic Customer Support Service Number?

Quest Diagnostic is a clinical laboratory operating in the United States, Brazil, Mexico, and Puerto Rico. This Fortune 500 company is known for maintaining collaborative agreements with numerous hospitals and clinics throughout the world. Quest is known for offering diagnostic testing services for infectious disease, cardiovascular, cancer, neurological disorder, Covid-19, as well as employment and court-ordered drug testing.

If you are looking to seek assistance for any of your queries or issue with Quest Diagnostic services, you can contact their Quest customer support service number or other assistance options to get a reliable assistance. To know the Quest Customer Support Service number or how to contact them, go through the information provided below.

Quest Customer Support Service Phone Number for Assistance

Whether you want to make/cancel an appointment, make a bill payment, update your insurance, or get an insurance plan, you can seek all this information by calling Quest customer support service number. Below you can find the phone numbers for various departments of Quest Diagnostic. Use the appropriate phone number depending on the type of issue you need assistance with.

Department Phone Numbers
Quest Diagnostics Call 866-MYQUEST (866 697 8378)
Quest Diagnostics Employer Solutions 1(800) 877-7484
Quest Diagnostics Nichols Institute  
Nichols Institute, San Juan Capistrano: 1(800) 553-5445
Nichols Institute, Chantilly: 1(800) 336-3718
Nichols Institute, Valencia: 1(800) 421-4449
Quest Diagnostics Genomic Services 1 (866) GENE-INFO
AmeriPath 1(800) 890-6220
Dermpath Diagnostics 1(800) 890-6220
Cleveland HeartLab 1(866) 358 9828 option 1
Diagnostic Laboratory of Oklahoma (DLO) 1 (800) 891-2917
ExamOne 1 (800) 677-6726


Apart from calling the above-mentioned phone numbers to contact Quest Customer support for assistance, you can also reach them using the options provided below.

Other Ways to Contact Quest Diagnostic Customer Support for Assistance

  1. Frequently Asked Questions (For Billing)

If you have any queries or issues related to billing such as overcharged, problem making an online payment, modes of payment, received a bill without service, etc. you can find answers to such queries easily at the Frequently Asked Questions section of Billing Services on Quest Diagnostics’ website. To know how to get to the Frequently Asked Questions section, follow the instructions provided below.

  • Open a web browser on your computer and go to the homepage of Quest Diagnostics (https://www.questdiagnostics.com/).
  • Once you are on the page, you will need to click on the Fore Patients tab located in the ribbon menu on the upper section of the screen. This will open a drop-down menu on your screen.
  • From the drop-down menu, you will need to select the FAQs for Billing option under Billing Information & Customer Service You will be directed to the next page.
  • On the next page, you will need to browse through the list of common queries to find the answer to the query or concern you have with Quest services.


  1. Contact Us

Quest Diagnostics customer support is also known for providing a Contact Us page to seek assistance for your issues. On the Contact Us page, all you need to do is select the appropriate option from the given menu to reach the right team for assistance. Here are the steps you will need to follow to get to the Contact Us page on the Quest Diagnostics website.

  • Go to the homepage of Quest Diagnostics (https://www.questdiagnostics.com/) on a computer web browser.
  • Once you are on the homepage, you will need to scroll down to the bottom of the page.
  • At the bottom of the page, you will need to click on the Contact Us option. This will take you to the Contact Us page on the next screen.
  • On the Contact Us page, you will need to select the relevant option under the I am a / an For this, you will simply need to click on the Choose option and select the appropriate option from the drop-down menu.
  • After selecting one of the options, click on the Submit button, and follow the on-screen prompts to get assistance.

NOTE: In case you are located outside of the US, you will need to click on the View international contact options on the Contact Us page.


  1. Email Support

Another ideal option to contact Quest customer support services is through email. If you have queries or concerns related to Billing, Appointments, Patient Service Centers, you can use the following links to contact Quest customer support through email.

  • Email support for Billing


  • Email assistance for Locations/Appointments


  • Assistance for Patient Service Centers through email



  1. Follow Quest Diagnostics on Social Media

If you wish to get the latest information, news, and updates about Quest Diagnostics products and services, you can follow them on social networking sites. Quest Diagnostics is available on several social media sites such as Facebook, Twitter, LinkedIn, and YouTube. Links to these social media pages of Quest diagnostics are as follow:

So, now as you know the Quest customer support service numbers and other mediums to contact Quest Diagnostics customer support, you can easily seek assistance when facing any issue with their services.

Leave a Comment