Quest Diagnostics provides laboratory testing, diagnostic information, patient service center appointments, billing services, insurance processing, MyQuest results access, employer testing solutions, and specialty lab services. Patients often contact Quest Diagnostics customer service for appointment scheduling, test results, billing questions, insurance updates, lab location information, missing results, MyQuest account help, specimen collection questions, Quest Mobile appointments, and payment concerns.
If you are looking for the Quest Diagnostics customer service phone number, the main Quest support line is 1-866-MYQUEST or 1-866-697-8378. Quest also provides online forms and self-service tools for billing, appointments, Patient Service Center questions, MyQuest results, and location support.
How to Contact Quest Diagnostics Customer Service
- Quest Diagnostics Customer Service Phone Number: 1-866-MYQUEST or 1-866-697-8378
- Customer Service Representative Hours: Monday through Friday, 7:00 AM to 6:00 PM CST for live representative help through Quest Assistant
- Online Customer Service: Quest Customer Service Contact Page
- Billing and Insurance: Quest Billing and Insurance Help
- Pay a Quest Bill: Quest Patient Bill Pay
- Make, Change, or Cancel an Appointment: Quest Appointment Scheduling
- Find a Quest Location: Quest Location Search
- Test Results and MyQuest: Quest Test Results Help
- Patient Service Center Inquiry Form: Patient Services Support Inquiry
- Quest Mobile Support: 1-855-392-6361
- Quest Mobile Hours: Monday through Friday, 7:00 AM to 5:00 PM PST
- Employer Solutions: 1-800-877-7484
- Genomic Services: 1-866-GENE-INFO or 1-866-436-3463
- Corporate Headquarters: Quest Diagnostics, 500 Plaza Drive, Secaucus, NJ 07094
- Corporate Headquarters Phone: 1-973-520-2700
- Website: questdiagnostics.com
Important privacy note: Quest warns that email and web forms are not secure methods for sensitive information. Do not submit Social Security numbers, passwords, usernames, detailed personal health information, or other sensitive data through public forms or public review comments.
Best Way to Reach Quest Diagnostics by Issue
- Appointment scheduling: Use Quest’s appointment scheduler to make, change, or cancel an appointment.
- Lab location or hours: Use the Quest location search because hours vary by Patient Service Center.
- Billing question: Use Quest Patient Bill Pay, the billing contact page, or call 1-866-697-8378.
- Insurance update: Use the billing portal and have your insurance card and Quest bill number ready.
- Test results: Log in to MyQuest and check the Results section before contacting support.
- Pending results: Check MyQuest for pending-result status, then use Message Quest if you still need help.
- Patient Service Center issue: Use the Patient Services Support Inquiry form for location or service center questions.
- Quest Mobile: Call 1-855-392-6361 for Quest Mobile support.
- Employer drug testing: Contact the employer or Quest Employer Solutions, depending on who ordered or arranged the test.
- Scam concern: Use Quest’s scam guidance and avoid paying suspicious upfront fees by prepaid card.
What to Have Ready Before Contacting Quest Diagnostics
- Your full name as it appears on the Quest order or bill
- Your date of birth, if requested through an official Quest support channel
- Your Quest bill number, invoice number, or lab code for billing questions
- The date of service or appointment date
- The Patient Service Center location used
- Your ordering provider’s name, if the test was ordered by a doctor
- Your MyQuest account email address for login or results questions
- Your insurance card, payer name, member ID, and group number for insurance updates
- Payment confirmation numbers, receipts, or billing notices
- Any previous Quest case number, message, email, or chat transcript
Common Quest Diagnostics Customer Service Issues
Common reasons customers contact Quest Diagnostics include:
- Making, changing, or canceling lab appointments
- Finding a nearby Quest Patient Service Center
- Questions about walk-ins, wait times, or location hours
- Missing, delayed, pending, or unavailable test results
- MyQuest login, password reset, account, or family-results access issues
- Billing questions, duplicate bills, insurance processing, or self-pay pricing
- Updating insurance information after receiving a Quest bill
- Understanding a Quest invoice, lab code, bill number, or patient responsibility amount
- Payment plans, financial assistance, and payment confirmation issues
- Questions about doctor-ordered tests versus self-purchased tests
- Quest Mobile appointment questions
- Employment drug testing scams or suspicious payment requests
Quest Diagnostics Customer Reviews and Complaints on CSN
The live CustomerServiceNumbers.com Quest Diagnostics page currently shows zero customer reviews. Because there are no live CSN reviews yet, there is not enough CSN feedback to summarize a reliable Quest Diagnostics customer-service trend on this site.
If you have contacted Quest Diagnostics about appointments, billing, insurance, test results, MyQuest access, lab locations, Quest Mobile, Patient Service Center concerns, or a complaint, you can leave a review below. Reviews are individual experiences and may not represent every Quest location, test type, billing situation, provider order, or support case.
Appointments, Lab Locations, and Patient Service Centers
Quest patients can usually make, change, or cancel appointments online. Appointments often receive priority over walk-ins, but wait times can vary by location, staffing, test type, time of day, and whether special collection requirements apply.
Before visiting a Quest location, check the location page for hours, accepted services, holiday closures, parking details, and whether the site handles your specific test. Some locations may have different hours for drug screening, pediatric draws, glucose testing, or specialty collections.
Test Results and MyQuest Help
Quest patients can use MyQuest to view many lab results, track pending results, and manage family results through eligible account features. If results do not appear, check whether the sample has been collected, whether the test is still processing, whether the ordering provider must review results first, and whether the correct MyQuest account is being used.
If you do not see the answers you need in the MyQuest FAQs, use Quest Assistant or Message Quest so the inquiry can be routed to the correct support team. Do not post test results, medical diagnoses, or personal health details in public comments.
Billing, Insurance, and Payment Help
Quest patients can pay bills online, by mail, or by phone. Billing help may include insurance updates, bill status, payment plans, financial assistance, self-pay questions, lab-code questions, and explanations of patient responsibility amounts.
If you receive a bill you do not understand, have the Quest bill number, invoice number, lab code, date of service, insurance information, and any Explanation of Benefits from your health plan ready before contacting Quest. If your insurance was not applied correctly, use the billing portal to update your insurance or contact billing support.
Quest Mobile, Employer Testing, and Specialty Support
Quest Mobile provides mobile sample collection support for eligible patients and services. Quest lists Quest Mobile customer service at 1-855-392-6361, Monday through Friday, 7:00 AM to 5:00 PM PST.
For employment drug testing, occupational health, or employer-arranged screening, confirm whether Quest, the employer, or a third-party screening administrator is responsible for scheduling, payment, instructions, and result handling. For Employer Solutions, Quest lists 1-800-877-7484.
Quest Diagnostics Scam and Payment Warning
Quest warns consumers about employment drug-testing scams where a fake employer asks for upfront payment, often using a prepaid card, as part of an onboarding or hiring process. If a supposed employer asks you to pay for a drug test with a prepaid card, treat it as a red flag and verify the job opportunity before sending money.
- Do not pay suspicious drug-testing fees with prepaid cards, cryptocurrency, gift cards, wire transfers, or payment apps.
- Do not share your Social Security number, insurance details, payment card, or MyQuest login through an unofficial link.
- Use questdiagnostics.com, patientbill.questdiagnostics.com, myquest.questdiagnostics.com, or official Quest portals instead of links from suspicious emails or texts.
- If you believe you were impacted by a scam, Quest lists 1-908-900-4475 as a scam contact option.
- Report suspected scams to your local law enforcement, the Federal Trade Commission, or the Internet Crime Complaint Center when appropriate.
How to Escalate a Quest Diagnostics Complaint
If your issue is not resolved after contacting Quest Diagnostics customer service, try these escalation steps:
- Write down the date, time, phone number called, form submitted, representative name, and case number.
- Save your appointment confirmation, bill, invoice number, lab code, payment receipt, insurance update confirmation, and MyQuest messages.
- Use the correct support route again and ask for the issue to be reviewed or escalated.
- If the issue involves billing, ask whether the problem is with Quest billing, your insurance plan, your provider’s coding, or missing insurance information.
- If the issue involves test results, ask whether the test is pending, canceled, held for provider review, or tied to a different MyQuest account.
- If the issue involves a location visit, include the Patient Service Center address, date, time, and appointment confirmation.
- If the issue involves personal health information, use secure Quest channels rather than public comments.
- For corporate-level concerns, use the Quest Diagnostics corporate office resource linked below.
Quest Diagnostics Compared with Competitors
Quest Diagnostics competes with other laboratory, diagnostic testing, and patient service center providers such as Labcorp, BioReference Laboratories, Any Lab Test Now, and local hospital or health-system labs. Patients comparing providers often look at insurance network status, location convenience, appointment availability, test menu, result speed, billing clarity, wait times, MyQuest or portal access, and how quickly support resolves billing or results issues.
Related Customer Service and Consumer Resources
- Quest Diagnostics Corporate Office Headquarters
- Labcorp Customer Service
- Insurance Customer Service Numbers
- CSNDB.com Chat and Text Support Resources
- ChargeOnMyCard.com: Identify Unknown Credit Card Charges
- ThinkItIsAScam.com: Scam and Fraud Warning Guides
- ZeroStars.org: Read and Leave Company Reviews
Frequently Asked Questions About Quest Diagnostics Customer Service
What is the Quest Diagnostics customer service phone number?
The Quest Diagnostics customer service phone number is 1-866-MYQUEST or 1-866-697-8378. Use this number for many patient support, billing, appointment, location, and general Quest questions.
What are Quest Diagnostics customer service hours?
Quest’s MyQuest help lists live customer service representative hours as Monday through Friday, 7:00 AM to 6:00 PM CST. Individual Patient Service Center hours vary by location, so check the location page before visiting.
How do I make or change a Quest Diagnostics appointment?
Use Quest’s online appointment scheduler to make, change, or cancel an appointment. Have your order details, location preference, and contact information ready.
How do I get Quest Diagnostics test results?
Log in to MyQuest and check the Results section. If results are pending, MyQuest may show status updates. Some results may require additional processing time or provider review.
How do I contact Quest Diagnostics billing?
Use Quest Patient Bill Pay, the online billing contact option, or call 1-866-697-8378. Have your bill number, invoice number, lab code, date of service, and insurance card ready.
Can I update my insurance on a Quest bill?
Yes. Quest’s billing portal allows patients to update insurance information on a bill. You should have your insurance card and Quest bill number ready before starting.
How do I contact Quest Mobile?
Quest Mobile customer service can be reached at 1-855-392-6361. Quest lists Quest Mobile support hours as Monday through Friday, 7:00 AM to 5:00 PM PST.
How do I report a Quest Diagnostics scam?
If you believe you were impacted by a Quest-related scam, Quest lists 1-908-900-4475 as a scam contact option. You should also consider reporting scams to local law enforcement, the FTC, or IC3.
Where is Quest Diagnostics corporate headquarters?
Quest Diagnostics corporate headquarters is located at 500 Plaza Drive, Secaucus, NJ 07094. The corporate headquarters phone number is 1-973-520-2700. For routine patient issues, use Quest customer service, billing support, MyQuest, or the appointment tools first.
Page Update Note
Updated June 2026: This page was refreshed with current Quest Diagnostics customer service routing for appointments, billing, insurance, test results, MyQuest, Patient Service Centers, Quest Mobile, employer testing, scams, and corporate contact information.
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Share Your Quest Diagnostics Customer Service Experience
Have you contacted Quest Diagnostics customer service about appointments, billing, insurance, test results, MyQuest access, lab locations, Quest Mobile, Patient Service Center issues, employer testing, or a complaint? Share your experience below. Include the support route you used, how long it took to get help, and whether Quest resolved the issue. Do not include private health information, Social Security numbers, insurance IDs, account passwords, full addresses, or payment details in public comments.
Customer Service Numbers Disclaimer
CustomerServiceNumbers.com is not affiliated with Quest Diagnostics Incorporated, Quest Diagnostics, MyQuest, Quest Mobile, or questdiagnostics.com. This page is provided for informational and consumer-feedback purposes only. Phone numbers, support hours, billing options, appointment rules, insurance procedures, result timing, test availability, location hours, and website links may change. Do not post private medical, billing, insurance, or identity information in public comments. Always verify important healthcare, billing, insurance, privacy, legal, and safety information directly with Quest Diagnostics or your healthcare provider before taking action.
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