5 Things to Do Before You Pay a Lab Bill

That lab bill sitting on your kitchen table? Don't pay it yet.

According to Pat Palmer, founder of Medical Billing Advocates of America — a professional advocate who has reviewed tens of thousands of bills over 20+ years — over 80% of medical bills contain at least one error. And if you're on Medicare, a 2023 Consumer Financial Protection Bureau report found that 53% of Medicare patients who complained about medical debt said the amount they were billed wasn't even accurate.

You have rights here. You have time. And you have more leverage than you think.

Here are five things to do before you write that check.

1. Request an Itemized Bill

Most labs don't send a line-by-line breakdown by default. Instead, they send a summary bill — a total at the bottom with little detail. That's not enough to check for errors.

Call the billing office and ask specifically for an itemized bill — a list of every individual service billed, with its procedure code (called a CPT code) and the charge for each one. You are entitled to one, and hospitals are required to provide it within 30 days.

When you get it, look for duplicate charges, services you don't recognize or didn't receive, and codes that don't match what your doctor ordered. AARP recommends requesting itemized bills from every provider involved — not just the main lab, but also any pathologist or specialist who reviewed your results.

The good news: it works. A 2024 JAMA Health Forum study found that roughly 75% of patients who contacted a billing office about an error had the mistake corrected. Just calling — with your itemized bill in hand — changes the conversation.

2. Check What Medicare Actually Pays

Labs don't advertise this, but their "list price" often has almost no relationship to what Medicare — or any insurer — considers fair.

Medicare sets payment rates for lab tests through the Clinical Laboratory Fee Schedule (CLFS). A 2024 study of 42 large Florida hospitals found the average hospital price for a Complete Blood Count (CBC) was $401. Medicare's rate for the same test: $7.77. A Comprehensive Metabolic Panel averaged $957 at the hospital versus a $10.56 Medicare rate. That's 50 to 90 times what Medicare pays.

That's exactly what GougeStop is built to show you. Open the GougeStop app, snap a photo of your lab bill or order — in about 60 seconds you'll see what Medicare actually pays for each test alongside what you're being charged. Free, fast, and no billing jargon required.

This gap matters most when Medicare denies a test and the lab's full list price lands in your mailbox. Knowing the Medicare rate gives you a concrete baseline for what's fair, and real leverage to push back.

3. Read Your Medicare Summary Notice — And Ask About the ABN

A few times a year, Medicare mails you a Medicare Summary Notice (MSN). It is not a bill. But it's one of the most important documents you can read after getting lab work done.

The MSN shows every service billed to Medicare during that period: what the provider charged, what Medicare approved, what Medicare paid, and the maximum you should owe. If you receive a bill higher than what your MSN shows as your share, contact the provider immediately. You can view your MSN online at MyMedicare.gov rather than waiting for the paper version. If you're on Medicare Advantage, you'll receive an Explanation of Benefits (EOB) from your plan instead — it works the same way.

4. Know Your Appeal Rights — and Use Them

If Medicare denies a claim, most people just pay the bill. That's a mistake.

Many initial denials should never have happened. For Original Medicare, you have 120 days from the date you received the denial to file a redetermination request — the first of five levels of appeal. You don't need a lawyer. Write a letter explaining why you disagree, attach supporting documents from your doctor, and submit it to the Medicare Administrative Contractor listed on your denial notice.

If you're not sure where to start, the State Health Insurance Assistance Program (SHIP) offers free one-on-one Medicare counseling. Call 877-839-2675.

The founder of GougeStop missed his own 120-day window before he understood the process — that experience is part of why he built this tool.

5. Negotiate — or Compare Prices Before Your Next Test

You can negotiate a medical bill. Most people don't know this — but most who try get results.

A 2024 JAMA Health Forum study found that 76% of patients who attempted to negotiate got some form of financial help or had the bill canceled entirely. AARP recommends asking for a "settlement amount" — those words signal to the billing office that you're ready to pay cash and close the account. Start at 50% of the balance or lower, and get any agreement in writing before you pay.

The Medicare rate you looked up in step two is your anchor in that conversation. It's very hard for a lab to defend a bill that's 5 or 10 times what Medicare considers fair.

Even better: compare prices before your next test. A Tennessee study found cash prices for the same lab test differed by as much as 243 times between the cheapest and most expensive hospital. The lab your doctor's office defaults to isn't always your only option — or your most affordable one. GougeStop lets you see what labs near you charge for common tests, so you can compare before you go.

The Bottom Line

Lab bills in this country are complicated by design. Prices are hidden, errors are common, and most patients — especially those on Medicare — pay whatever number is on the bill because they don't know they have any other choice.

You do.

Request the itemized bill. Look up what Medicare pays at GougeStop. Check your MSN — and if anything was denied, ask for the ABN before you pay. File an appeal if you disagree. And negotiate before you write that check.