If your Labcorp bill doesn't match your insurer's explanation of benefits (EOB), Labcorp's billing page says to send a copy of the EOB by fax to 866-227-2939, or by mail to P.O. Box 2240, Burlington, NC 27216-2240. Include your Labcorp invoice number. For billing questions, call 800-845-6167. Labcorp does not publish a fax number for general medical records requests.

This guide covers the verified Labcorp fax number, what to send with it, and how to request Labcorp records instead.

  • One verified fax for EOB copies and billing reviews
  • Invoice number on every page, as Labcorp asks
  • Records requests go online or through Labcorp's privacy office

Table of Contents

Verified Labcorp fax number

Verified November 2026:

What you are sending Fax number Source
EOB copy when your Labcorp bill doesn't match it 866-227-2939 Labcorp patient billing

Notes:

  • Mail alternative: P.O. Box 2240, Burlington, NC 27216-2240.
  • Billing phone: 800-845-6167.
  • Subsidiaries: some Labcorp specialty labs publish their own fax lines for their own forms. Use the number printed on the form from that lab.

Fixing a bill that doesn't match your EOB

Labs bill after your insurer processes the claim. If Labcorp's bill is higher than the patient responsibility on your EOB, the claim may have been processed with old insurance details or before an adjustment. Labcorp will review it when you send the EOB:

  1. Get the EOB for the date of service from your insurer's website or mail.
  2. Write your Labcorp invoice number on the EOB and the cover sheet.
  3. Add a short note: "Bill does not match EOB, please review," with your phone number.
  4. Fax it to 866-227-2939.

If your insurance changed, include a copy of the front and back of your current insurance card too.

Requesting Labcorp records

We did not find a fax number for Labcorp medical records requests on labcorp.com. Labcorp's privacy notice points patients to:

  • A courtesy copy at a Labcorp patient service center
  • A patient portal account, to get lab reports electronically
  • Labcorp's HIPAA Patient Request Form
  • The Labcorp Privacy Officer, by calling 877-234-4722 (877-23-HIPAA) or emailing privacyofficer@Labcorp.com

For general advice on records requests, see our medical records fax guide.

How to fax Labcorp, step by step

  1. Confirm it's a billing issue, such as a bill that doesn't match your EOB.
  2. Gather the bill, the EOB and your insurance card.
  3. Write the invoice number on every page.
  4. Fax it to 866-227-2939 and keep the confirmation.
  5. Call 800-845-6167 if you don't hear back.

You can send a fax online for $2.99 with no subscription and no account.

Mistakes that slow down a Labcorp billing review

  • No invoice number on the pages.
  • Sending a records request to the billing fax.
  • An EOB for a different date of service.
  • Faxing the bill without the EOB. The EOB is what Labcorp needs to compare.

Fax your EOB to Labcorp now →

Frequently asked questions

What is the Labcorp billing fax number?

Labcorp's patient billing page says that if your bill doesn't match your EOB, you can send a copy of the EOB by fax to 866-227-2939, or by mail to P.O. Box 2240, Burlington, NC 27216-2240. Include your Labcorp invoice number.

What is the Labcorp billing phone number?

Labcorp's billing page lists 800-845-6167.

Does Labcorp have a fax number for medical records?

We did not find one on labcorp.com. Labcorp's privacy notice says you can request a copy at a patient service center, through a patient portal account, with its HIPAA Patient Request Form, or by contacting its Privacy Officer.

Where do I mail a Labcorp payment?

Labcorp's billing page lists P.O. Box 2240, Burlington, NC 27216-2240, and asks you to attach the bill stub and write your 8-digit invoice number on the check or money order.

Do I need a fax machine to fax Labcorp?

No. You can fax your EOB online from your phone or computer and keep the delivery confirmation.

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