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Holiday schedule

Quest Diagnostics Patient Service Centers will have modified hours during the holiday season.

  • Closing early at 12:00pm on December 31, 2025
  • Closed on January 1, 2026


Have a healthy, happy holiday!

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Quest Diagnostics

Submit an invoice for payment

Based on your selection, here are options that match your request:

  • To submit an invoice for payment, with a PO number, please send your invoice to APExternalPOInvoiceWorkflow@questdiagnostics.com as indicated on the purchase order.
  • To submit an invoice, without a PO number, send your invoice to the product or service requester (end user person that placed the order).
  • Invoices for telephone lines and utilities (for non-electronic orders) should be mailed to:
    PO Box 389
    Norristown, PA 19408

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Our company

Quest® is the brand name used for services offered by Quest Diagnostics Incorporated and its affiliated companies. Quest Diagnostics Incorporated and certain affiliates are CLIA-certified laboratories that provide HIPAA-covered services.  Other affiliates operated under the Quest® brand, such as Quest Consumer Inc., do not provide HIPAA-covered services. 

 

Quest®, Quest Diagnostics®, any associated logos, and all associated Quest Diagnostics registered or unregistered trademarks are the property of Quest Diagnostics. All third-party marks—® and ™—are the property of their respective owners. © 2025 Quest Diagnostics Incorporated. All rights reserved. Image content features models and is intended for illustrative purposes only.