Quest Diagnostics is a major diagnostic testing, laboratory services, and health information company headquartered in Secaucus, New Jersey. This page provides updated Quest Diagnostics corporate office and headquarters information, including corporate phone numbers, patient support contacts, billing help, complaint guidance, privacy reminders, and escalation tips.
Quest Diagnostics Corporate Office and Headquarters Information
Quest Diagnostics’ corporate headquarters is located at 500 Plaza Drive in Secaucus, New Jersey. Patients, healthcare providers, investors, job applicants, and business partners may need different contact routes depending on whether the issue involves a lab appointment, test result, bill, insurance question, patient service center, employment matter, or corporate-office concern.
- Company Name: Quest Diagnostics Incorporated
- Corporate Headquarters: 500 Plaza Drive, Secaucus, NJ 07094, USA
- Main Corporate Phone Number: 1-973-520-2700
- Headquarters Listing Phone: 1-800-222-0446
- Customer Service / Patient Support: 1-866-MYQUEST / 1-866-697-8378
- Official Website: questdiagnostics.com
- Corporate Headquarters Contact Page: Contact Corporate Headquarters
- Customer Service Page: Quest Customer Service
- Billing and Insurance Help: Quest Billing and Insurance
About Quest Diagnostics
Quest Diagnostics provides diagnostic testing, laboratory services, health information, and related services for patients, physicians, hospitals, employers, health plans, and other healthcare organizations. The company’s predecessor businesses date back to 1967, and Quest Diagnostics Incorporated was incorporated in Delaware in 1990.
Quest is best known by many patients for blood testing, lab appointments, specimen collection, patient service centers, online test results, billing, insurance processing, and physician-ordered diagnostic testing. Because Quest operates in a regulated healthcare environment, many issues require identity verification, patient authorization, insurance information, or communication through the ordering healthcare provider.
How to Contact Quest Diagnostics About a Complaint
For most Quest Diagnostics complaints, start with the specific route tied to your issue. A billing dispute, appointment problem, test result delay, insurance question, or patient service center complaint may need different documentation.
- Billing complaints: Have your bill, invoice number, insurance information, explanation of benefits, payment confirmation, and any payment-plan details ready.
- Appointment complaints: Keep your confirmation number, appointment date, location, check-in time, and screenshots of any scheduling issue.
- Test result concerns: Contact your ordering healthcare provider first if you need medical interpretation or if results are missing from your provider’s system.
- Patient service center complaints: Include the location, appointment time, staff interaction details, wait time, and any case number from Quest support.
- Insurance issues: Save your insurance card, claim information, denial notice, lab order, and any correspondence from Quest or your insurer.
- Escalation: Ask Quest for a case number and written confirmation when a billing, appointment, or support issue remains unresolved.
Quest Diagnostics Billing, Insurance, and Payment Help
Billing and insurance concerns are among the most common reasons patients contact diagnostic testing companies. If you receive a Quest Diagnostics bill that you do not understand, compare the bill with your insurance explanation of benefits and confirm whether the test was ordered by your physician, whether Quest had your current insurance information, and whether the claim was processed by your health plan.
If you arranged a payment plan or submitted a payment, keep screenshots, confirmation numbers, bank records, and emails. Reader comments on this page have included concerns about payment-plan handling and difficulty getting a billing issue resolved, so written documentation can be especially important.
Quest Diagnostics Appointment and Patient Service Center Issues
For appointment-related complaints, confirm whether you scheduled through Quest, your provider, a third-party system, or a walk-in location. Patient service center wait times can vary by location, staffing, appointment volume, insurance verification, test type, and specimen collection requirements.
Reader comments on this page have included complaints about long waits despite having an appointment. If you experienced a similar issue, include the location, date, appointment time, check-in time, and any confirmation number when contacting Quest.
Privacy, Medical Information, and Test Result Warning
Quest Diagnostics handles sensitive health information. Do not post your Social Security number, full date of birth, insurance ID, medical record number, test results, diagnosis, or other private health information in a public comment. Use Quest’s official website, your MyQuest account, your physician’s office, or the phone number on your bill for private account-specific help.
CorporateOfficeHeadquarters.com cannot access Quest accounts, bills, appointment records, test results, insurance claims, or patient files. For medical interpretation of lab results, contact the healthcare provider who ordered the test.
Fraud and Scam Warning for Quest Diagnostics Customers
Be cautious with fake lab bills, phishing emails, text messages about test results, fake appointment links, or calls asking for payment or personal medical information. Scammers may impersonate healthcare companies to collect credit card numbers, insurance IDs, Social Security numbers, or login credentials.
To protect yourself, use only official Quest Diagnostics websites and verified phone numbers. If you receive a suspicious bill, compare it with your insurance records and contact Quest directly before paying. If you believe you shared sensitive information with a scammer, contact your bank, insurer, healthcare provider, or the appropriate identity-protection resources.
Quest Diagnostics Competitors and Related Companies
Quest Diagnostics competes with other laboratory, diagnostic testing, health information, and patient service center companies. Major competitors and related healthcare companies include Labcorp, Any Lab Test Now, hospital-based laboratory systems, specialty testing providers, and regional diagnostic laboratories.
Related CorporateOfficeHeadquarters.com pages include:
Frequently Asked Questions About Quest Diagnostics Corporate Office
Where is Quest Diagnostics corporate office?
Quest Diagnostics is headquartered at 500 Plaza Drive, Secaucus, NJ 07094, USA.
What is Quest Diagnostics’ corporate phone number?
Quest Diagnostics’ main corporate phone number is 1-973-520-2700. Quest also lists 1-800-222-0446 on its headquarters location listing.
What is Quest Diagnostics customer service number?
Quest Diagnostics lists 1-866-MYQUEST / 1-866-697-8378 for customer service, billing, locations, appointments, and patient service center questions.
How do I complain about a Quest Diagnostics bill?
Use Quest’s billing and insurance help route or call Quest customer service. Have your bill, invoice number, insurance information, payment records, and explanation of benefits available before calling.
Can Quest Diagnostics give medical advice about my lab results?
Quest may provide access to lab results, but medical interpretation should come from the healthcare provider who ordered the test. Contact your doctor or ordering provider with medical questions about your results.
Is CorporateOfficeHeadquarters.com affiliated with Quest Diagnostics?
No. CorporateOfficeHeadquarters.com is not affiliated with Quest Diagnostics and cannot access patient accounts, bills, appointments, lab results, insurance claims, or medical records.
Why Trust CorporateOfficeHeadquarters.com?
CorporateOfficeHeadquarters.com provides corporate office, headquarters, company contact, complaint, and escalation information for major companies. Our goal is to help readers find public-facing corporate details, understand where a company is headquartered, and share experiences through reviews and comments.
Page Update Note
This Quest Diagnostics corporate office page was updated on July 6, 2026 to confirm the Secaucus headquarters address, update the main corporate phone number, add Quest customer service and billing routes, include patient privacy reminders, and improve complaint guidance for billing, appointments, patient service centers, and test-result issues.
Disclaimer
CorporateOfficeHeadquarters.com is not affiliated with Quest Diagnostics Incorporated or any Quest Diagnostics location, patient service center, laboratory, billing department, or healthcare provider. This page is for informational purposes only. Company names, trademarks, logos, phone numbers, addresses, and website links are the property of their respective owners and may change at any time. This page does not provide medical, billing, insurance, or legal advice.
Share Your Experience with Quest Diagnostics
Have you contacted Quest Diagnostics corporate office or customer service about a lab appointment, billing issue, insurance problem, test result delay, payment plan, patient service center visit, or complaint? Share your experience in the comments below. Your feedback helps other readers understand how Quest Diagnostics handles corporate-office concerns and customer escalations.