Labcorp customers may need help with an unexpected bill, insurance claim, missing test order, appointment, Patient Portal account, test results, or an at-home testing order. The correct place to start depends on the type of problem you are trying to resolve.
Below are Labcorp’s primary support options, along with practical steps for reaching the correct department and documenting an unresolved complaint.
Labcorp contact information reviewed and updated in June 2026.
Labcorp Customer Service Help by Issue
Use the following guide to determine which Labcorp department or resource is most appropriate for your situation.
- Billing, payments or insurance: Contact Labcorp Patient Billing or sign in to the Patient Portal.
- Bill does not match your insurance explanation of benefits: Compare both documents, verify that Labcorp has the correct insurance information and contact Patient Billing.
- Self-pay price or good faith estimate: Contact Labcorp before testing to request an estimate of expected charges.
- Make, change or cancel an appointment: Use Labcorp’s online location and appointment tools.
- Missing test order: Contact the healthcare provider who ordered the testing and confirm that the order was sent to Labcorp.
- Test results are not appearing: Check that the personal information in your Patient Portal account matches the information submitted by your healthcare provider.
- Questions about the medical meaning of results: Contact the healthcare professional who ordered the test.
- Labcorp OnDemand or at-home test order: Contact the separate OnDemand support department.
- Complaint about a particular Labcorp location: Record the address, visit date and appointment time before submitting feedback.
- General patient complaint or unresolved issue: Use Labcorp’s Patient Inquiry Form and keep a copy of your submission.
How To Contact Labcorp
- Labcorp Patient Billing: 1-800-845-6167
- Billing Representative Hours: Monday through Friday, 8:00 a.m. to 5:00 p.m. ET
- Automated Bill Payments: 1-800-845-6167, available 24 hours a day
- Self-Pay and Good Faith Estimates: 1-800-762-4344, Monday through Friday, 8:00 a.m. to 5:00 p.m. ET
- Labcorp OnDemand and At-Home Test Support: 1-800-833-3935
- Labcorp OnDemand Email: [email protected]
- Patient Inquiry Form: Send Labcorp a Message
- Patient Portal: View Results, Bills and Appointments
- Locations and Appointments: Find a Labcorp Location
- Billing and Insurance Help: Visit Labcorp Billing Support
- Corporate Headquarters: 531 South Spring Street, Burlington, NC 27215
- Official Website: Labcorp.com
Important: The number 1-800-833-3935 is used for Labcorp OnDemand and supported at-home testing products. It should not be treated as the general Labcorp Patient Portal support number.
Common Reasons Customers Contact Labcorp
Labcorp customer service inquiries commonly involve billing, insurance processing, appointments, test orders, results and account access. The correct resolution may involve Labcorp, the ordering healthcare provider or the customer’s insurance company.
Unexpected Labcorp Bills
A patient may receive a separate Labcorp bill because Labcorp performed laboratory testing ordered by a physician or another healthcare provider. The amount billed to the patient may depend on insurance coverage, deductibles, copayments, network status and the information submitted with the order.
Before paying a bill you believe is incorrect, compare the Labcorp invoice with the explanation of benefits provided by your insurance company.
Insurance Was Not Applied Correctly
If insurance information is missing or outdated, update it through the Labcorp Patient Portal or contact Patient Billing. Have the Labcorp invoice number, insurance card and explanation of benefits available.
If the insurance company has not processed the claim, contact the insurer to confirm the claim’s status before disputing the amount with Labcorp.
Payment Is Not Showing on the Account
Online and telephone payments may take time to appear on an account. Labcorp advises allowing approximately 24 to 48 hours for a recently submitted payment to update.
If the balance remains unchanged after that period, contact Patient Billing with the payment date, amount and confirmation information.
Labcorp Invoice Not Found
When using online bill pay, confirm that you entered the complete eight-digit invoice number. The ZIP code and date of birth must also match the information associated with the invoice.
Missing Test Order
Labcorp generally receives test orders from healthcare providers. If a location cannot find your order, contact the provider who requested the testing and confirm:
- The order was sent to Labcorp
- Your name and date of birth are correct
- The order has not expired
- You were directed to the correct laboratory
- You do not need to bring a printed test request
Missing or Delayed Test Results
Start by signing in to the Labcorp Patient Portal and confirming that your name, date of birth, address and other identifying information are accurate.
Next, contact the ordering provider to make sure the information on the test order matches your Patient Portal profile. If the information is correct and the results are still unavailable, use Labcorp’s Patient Inquiry Form.
Questions about what a test result means medically should be directed to the healthcare professional who ordered the test.
Appointment or Location Problems
Appointments can be scheduled, changed or canceled through Labcorp’s online appointment tools. Services, operating hours and walk-in availability may differ by location.
For a complaint involving a specific patient service center, record:
- The complete location address
- The date and approximate time of the visit
- Whether you had an appointment
- The type of service requested
- A factual description of what occurred
- Whether you spoke with an employee or location manager
How To Resolve a Labcorp Billing Problem
- Review the Labcorp invoice. Confirm the patient name, healthcare provider, date of service and invoice number.
- Compare it with your insurance explanation of benefits. Look for the amount billed, insurer payment, contractual adjustment and patient responsibility.
- Verify your insurance information. Make sure Labcorp has the correct primary and secondary insurance details.
- Check with your insurance company. Ask whether the claim was received, processed, denied or still pending.
- Contact Labcorp Patient Billing. Explain the specific difference between the Labcorp bill and the insurer’s explanation.
- Document the conversation. Record the date, representative’s name, reference number and promised next step.
- Follow up in writing when necessary. Use Labcorp’s official contact form or the instructions shown on the bill.
Before Contacting Labcorp Billing
Have the following information available:
- Your eight-digit Labcorp invoice number
- The date of laboratory service
- The ordering healthcare provider’s name
- Your insurance card
- Your explanation of benefits
- Details of any previous payment
- Notes from earlier calls or messages
How To Escalate an Unresolved Labcorp Complaint
If the first customer service contact does not resolve the problem, ask the representative what department owns the issue and whether a supervisor or billing specialist can review it.
For continued problems:
- Write down each contact date and the outcome.
- Request a reference or case number when available.
- Use Labcorp’s Patient Inquiry Form to create a written record.
- For an insurance dispute, contact the insurance company and request its appeal instructions.
- For a missing test order, return to the ordering healthcare provider.
- For a location-specific complaint, identify the exact patient service center.
- For a broader corporate concern, review the Labcorp Corporate Office Headquarters information.
Do not include Social Security numbers, full insurance identification numbers, passwords, medical results or other private health information in a public review.
Labcorp Customer Reviews and Complaint Sentiment
CustomerServiceNumbers.com uses the review section below to collect firsthand Labcorp experiences. As reviews are submitted, recurring subjects may include billing, insurance processing, appointments, wait times, test orders, result access and the responsiveness of customer support.
Review sentiment should be based on actual customer submissions rather than assumptions about Labcorp as a whole. Experiences may also vary significantly between individual locations and departments.
What To Include in Your Labcorp Review
A useful review should explain:
- Whether the issue involved billing, insurance, an appointment, results or a location
- The city and state of the Labcorp location, when relevant
- Which department or contact method you used
- How long it took to reach someone
- Whether the representative explained the next step
- Whether the problem was ultimately resolved
- How long the resolution process took
Labcorp Frequently Asked Questions
What should I do if my Labcorp bill does not match my insurance statement?
Compare the Labcorp invoice with your insurer’s explanation of benefits. Contact your insurance company to confirm how the claim was processed, then contact Labcorp Patient Billing at 1-800-845-6167 if the amounts still do not match.
Can I update my insurance information online?
Yes. Insurance information associated with a Labcorp bill can be reviewed or updated through the Labcorp Patient Portal. You may need the invoice number shown on your bill.
Why does my Labcorp account still show a balance after payment?
A payment may take approximately 24 to 48 hours to process and appear on the account. Contact Patient Billing if the balance has not updated after that period.
What should I do if Labcorp cannot find my test order?
Contact the healthcare provider who ordered the test. Confirm that the order was sent to Labcorp, that the identifying information is correct and whether you need to bring a printed copy.
What should I do if my results are missing from the Patient Portal?
Confirm that your Patient Portal profile matches the identifying information used by the ordering healthcare provider. If it matches and the results remain unavailable, submit a Patient Inquiry Form to Labcorp.
Can Labcorp customer service explain my test results?
Questions about the medical interpretation of laboratory results should be directed to the healthcare professional who ordered the testing.
How do I complain about a Labcorp location?
Use Labcorp’s patient contact or visit-feedback options. Include the location, visit date, appointment time and a factual description of the issue. You may also leave a review below to describe whether the problem was resolved.
Is 1-800-833-3935 the Labcorp Patient Portal phone number?
No. Labcorp currently uses 1-800-833-3935 for Labcorp OnDemand and supported at-home testing products.
Where is Labcorp headquartered?
Labcorp is headquartered at 531 South Spring Street, Burlington, North Carolina 27215. Corporate contact information is available on the Labcorp Corporate Office Headquarters page.
Labcorp Competitors and Alternatives
Labcorp competes with other national, regional and hospital-affiliated laboratory providers. Major alternatives may include Quest Diagnostics, BioReference Laboratories, Sonic Healthcare laboratories and local health-system laboratories.
The laboratory available to a patient may depend on the ordering provider, geographic location, type of testing and insurance network. Before choosing an alternative laboratory, confirm that it can perform the required test and participates in your health plan.
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Our goal is not simply to repeat a company phone number. We help consumers identify the correct department, prepare for the contact and understand possible next steps when an issue is not resolved.
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Share Your Labcorp Experience
Have you contacted Labcorp about a bill, insurance claim, appointment, missing test order, Patient Portal account, test result or experience at a laboratory location?
Leave a rating and review below. Explain which department or location you contacted, how long it took to receive assistance and whether the problem was resolved. Your experience may help another consumer determine the best next step.
Disclaimer: CustomerServiceNumbers.com is an independent consumer website and is not affiliated with Labcorp or Labcorp Holdings Inc. Labcorp does not provide customer support through this website. Contact Labcorp directly regarding laboratory services, billing, insurance, appointments, medical records or test results.
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