How to Pay Your Quest Diagnostics Bill Online and by Mail

Quest Diagnostics accepts payment through their online patient portal, by phone, and by mail — the fastest route is usually the portal if you have your account number and billing statement handy

Quest Diagnostics bills you after lab work is complete. You can pay that bill directly to Quest rather than waiting for insurance to process, and you have several ways to do it. The online portal is fastest because payment posts within one business day. Phone and mail both work but take longer — phone payments process in one to two business days, and mailed checks can take two to three weeks depending on where you mail them.

Your first step is to find your account number. It appears on your billing statement, on any lab receipt you received when you had blood drawn, or in your Quest patient portal account if you have already set one up. Without this number, customer service will need your date of birth and the phone number or address on file to locate your account.

Key Takeaways

• The Quest patient portal at questdiagnostics.com lets you pay online with a debit or credit card, and payment posts the next business day.
• You can call Quest Diagnostics customer service at 1-866-QUEST-99 (1-866-787-3899) to pay by phone with a debit or credit card.
• Mailing a check to Quest takes two to three weeks and requires your account number on the check itself so the payment reaches the right account.
• If you cannot pay the full amount now, contact Quest directly to ask about payment plans — some locations offer them for balances over a certain amount.
• Your billing statement shows the amount due, the due date, and the mailing address; keep it nearby when you pay.

Paying through the Quest patient portal online

Go to questdiagnostics.com and look for the "Pay My Bill" or "Patient Portal" link on the homepage. If you already have a portal account, sign in with your username and password. If you do not have an account, you will need to create one — this takes about five minutes and requires your date of birth, the last four digits of your Social Security number, and a phone number or address on file with Quest.

Once you are logged in, navigate to the billing or payment section. Your outstanding balance will appear with the amount due and the due date. Select the bill you want to pay and choose your payment method — Quest accepts Visa, Mastercard, American Express, and Discover. Enter your card information and confirm the payment. You will receive a confirmation number on screen; write it down or take a screenshot.

Online payments typically post to your account by the next business day. If you pay on a Friday evening, expect the payment to show by Monday. Quest will send you a payment confirmation email to the address on file, though this can take a few hours.

Paying by phone with Quest customer service

Call Quest Diagnostics customer service at 1-866-QUEST-99 (1-866-787-3899). Have your billing statement or account number ready. A representative will pull up your account and tell you the amount due and the due date. They will ask for your payment method — debit card or credit card only — and will process the payment over the phone.

Phone payments take one to two business days to post. You will receive a confirmation number during the call; write it down. Quest may also email a receipt, though this is not may provide. If you do not receive written confirmation within 24 hours, call back and reference your confirmation number to verify the payment went through.

Quest's phone lines are typically open Monday through Friday, 8 a.m. to 8 p.m. Eastern time, and Saturday 9 a.m. to 5 p.m. Eastern time. Wait times are often longer during the first week of the month when many bills are due.

Paying by mail with a check

Write a check to Quest Diagnostics. On the memo line, write your account number — this is the single most important step because it tells Quest which account to credit. If you do not include your account number, the payment may sit in a general account for weeks while Quest tries to match it to you.

Mail your check to the address printed on your billing statement. This address varies by region, so do not use a general Quest headquarters address. Your statement will say something like "Quest Diagnostics, P.O. Box [number], [City], [State]." Use that exact address.

Mailed checks typically take two to three weeks to arrive, be processed, and post to your account. If your due date is within two weeks, do not mail a check — use the portal or phone instead. If you are mailing close to the due date and are concerned about a late fee, call customer service first to let them know a payment is in the mail and to ask if they will waive the late fee if it arrives a few days after the due date.

What to do if you cannot pay the full amount now

Contact Quest Diagnostics customer service at 1-866-QUEST-99 before your due date. Explain your situation and ask whether a payment plan is available. Some Quest locations offer payment plans for balances over $500 or $1,000, though this varies by location and is not may provide. If a plan is available, Quest will set up a schedule of smaller payments spread over several months.

Payment plans typically do not require a credit check or a formal process. Quest will ask for your account number, the amount you can pay each month, and how many months you need. Once you agree to the plan, make your first payment when ready — this shows good faith and helps the arrangement stick.

If Quest does not offer a payment plan, ask whether they can place your account on hold while you save, or whether they will accept a smaller payment now and the rest later. Some representatives have discretion to work with you, especially if you have never missed a payment before.

Understanding your billing statement and due dates

Your Quest billing statement shows the date the lab work was performed, the tests that were run, the amount your insurance paid (if any), and the amount you owe. It also shows the due date — usually 30 days from the billing date. The statement lists the mailing address for payments and often includes a tear-off stub with your account number printed on it; use this stub if you are mailing a check.

If you do not receive a statement in the mail, log into your patient portal to view it online. Statements are usually available within 5 to 10 business days after your lab work. If you cannot find your statement and do not know the amount due, call customer service and they will tell you over the phone.

If your bill is past due, you may see a late fee added to your account. Quest typically charges a late fee 30 to 60 days after the due date, though this varies. Paying when ready, even if you are late, stops additional fees from accruing.

Frequently Asked Questions

Can I pay my Quest bill with insurance or a payment app like PayPal?

No. Quest only accepts debit cards, credit cards, and checks. They do not accept PayPal, Venmo, Apple Pay, or other digital wallets. If you are paying through the portal or by phone, you must enter your card information directly.

What if I paid my bill but it still shows as due on my account?

Online and phone payments take one to two business days to post. If you paid more than two business days ago and it still shows as due, call customer service with your confirmation number and ask them to verify the payment was received. If there was an error, they can usually correct it when ready.

Do I have to pay Quest directly, or can I wait for my insurance to pay?

You can do either. If your insurance covers the test, they will eventually pay Quest directly. However, Quest may bill you for the full amount first and then credit your account once insurance pays. If you want to avoid a bill in the meantime, you can pay now and request a refund once insurance pays, or you can wait for insurance to process and then pay only your remaining balance.

What happens if I do not pay my Quest bill?

Quest may report the unpaid balance to a credit reporting agency if it remains unpaid for 60 to 90 days. This can lower your credit score. Quest may also send your account to a collection agency. Before this happens, Quest will typically send you reminder notices and may call you. Paying as soon as you can stops this process.

Can I set up automatic payments with Quest?

The online portal does not offer automatic recurring payments. You must log in and pay each bill manually, or call customer service each time. If you want to automate payments, set a calendar reminder to pay on the due date, or call customer service to ask whether they can arrange automatic payments on your behalf — some representatives can set this up manually.