# Labcorp fax number for billing and EOB documents

Find Labcorp’s Patient Billing fax for an Explanation of Benefits when a bill needs review.

Country: United States
Category: Healthcare
Last reviewed: 2026-10-04 (published sources, not a test transmission)

## Which Labcorp fax number should I use?

Use this fax when sending billing evidence, such as an insurance Explanation of Benefits that differs from a Labcorp bill. Include the invoice number so Patient Billing can find the charge. This is not a medical records or lab-results request number.

## Labcorp Patient Billing: send an EOB or billing document

Fax: +1 866 227 2939
E.164: +18662272939

Toll-free number; service and international charges may still apply.

Submit an Explanation of Benefits for review of a Labcorp bill.

Use only when: Include the Labcorp invoice number and identify the charge that differs from your EOB. This is a billing route, not a lab-results or records-release request.

[Labcorp billing: EOB and bill discrepancies](https://www.labcorp.com/patients/help) — reviewed 2026-10-04

## What to include in your fax to Labcorp

Send a copy of the relevant EOB and identify the Labcorp invoice being questioned. Explain which charge or insurance adjustment you want reviewed; a complete medical chart is not needed to identify a billing discrepancy.

## Check the destination and prepare your cover page

Name the receiving department and the hospital, clinic or service involved. Add the document title, page count and a callback number. Put patient identifiers and authorization details in the fields the official form requests; a cover page does not replace signed consent.

Check the official source and recipient instructions before sending. A reviewed source confirms a published number, not live availability.

## Confirm delivery and follow up with Labcorp

These are fax destinations, not voice support lines. Keep the transmission result and a copy of the documents. Confirm with the receiving department that the packet is complete and can be processed; a delivery receipt does not establish acceptance or a decision. Check with that department before sending a duplicate.

## How to fax Labcorp without a fax machine

Prepare a legible PDF, verify the department and number, review the pages and authorize sending. DearFax supports [online sending](https://dearfax.com/send-fax-online) and workflows with [ChatGPT](https://dearfax.com/chatgpt) or [Codex](https://dearfax.com/codex) through [MCP](https://dearfax.com/mcp). Retain the transmission result.

Healthcare organizations should confirm their compliance requirements before selecting a fax service. DearFax does not currently offer HIPAA compliance.

## Frequently asked questions

### What Labcorp fax number should I use?

Labcorp Patient Billing: send an EOB or billing document: +1 866 227 2939. Use this fax when sending billing evidence, such as an insurance Explanation of Benefits that differs from a Labcorp bill. Include the invoice number so Patient Billing can find the charge. This is not a medical records or lab-results request number.

### Can I request Labcorp test results at this fax number?

This is Patient Billing’s destination for billing documents. Use Labcorp’s patient results or records-access process for test results.

### What documents can I fax to Labcorp?

Send a copy of the relevant EOB and identify the Labcorp invoice being questioned. Explain which charge or insurance adjustment you want reviewed; a complete medical chart is not needed to identify a billing discrepancy.

### What should I put on a fax cover page for Labcorp?

Name the receiving department and the hospital, clinic or service involved. Add the document title, page count and a callback number. Put patient identifiers and authorization details in the fields the official form requests; a cover page does not replace signed consent.

### How can I fax Labcorp without a fax machine?

Prepare your documents as a legible PDF and confirm the recipient’s submission requirements. You can use DearFax in your browser or prepare the fax with ChatGPT or Codex through MCP. Review the number and pages before authorizing the send, then keep the transmission result. Healthcare organizations should check their compliance requirements; DearFax does not currently offer HIPAA compliance.

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