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Customer Service

Contact Customer Service

Email or call us with questions or comments based on your area of interest below.

Company Phone number
Quest Diagnostics  
  • Call us:
Call 866-MYQUEST (866-697-8378)
  • Email us: 
Billing
Locations/Appointments
Patient Service Centers
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
Diagnostics Laboratory of Oklahoma (DLO) 1 (800) 891-2917
ExamOne 1 (877) 933-9261