I was charged $10,000 for kidney stone removal, so I asked for an itemized bill — and $3,600 was for treatments I never got. How do I fight this?

Another driver of high bills is the chargemaster, a hospital's internal master price list that assigns a rate to every procedure, medication, supply, and service it provides. Chargemasters can be dynamic, meaning prices can shift based on factors like demand, supply costs, or a hospital's financial targets (3).

Crucially, chargemaster rates are almost always far higher than what insurers actually pay, but uninsured or underinsured patients can end up on the hook for something much closer to that inflated sticker price. Billing errors often originate here, too: the wrong procedure code, a service logged incorrectly, or a line item that never gets removed can land on a patient's final bill.

Finally, there is medical fraud (4). Some providers deliberately bill for services never rendered, charge for more expensive procedures, or misrepresent non-covered treatments. The Department of Justice recovers billions of dollars each year through health care fraud enforcement actions. In 2025 alone, it recovered $14.6 billion from doctors, nurse practitioners, and other licensed medical professionals (5).

What to do if you think you were overcharged

Overbilling on medical bills happens more than most patients realize. According to patient advocates, here's what to do if you think you've been overcharged (6):

Ask for an itemized bill

An itemized bill breaks down every charge line by line — every procedure, medication, supply, and fee — rather than lumping costs into broad categories. It's the only way to spot errors like duplicate charges, services you didn't receive, or medications you were never given. You have the right to request one, and your provider is required to supply it.

Research the true cost

Federal rules require hospitals to post their prices online (7). If you want to compare what you were charged against what your hospital actually lists, start there. You can also use tools like the Hospital Price Files Finder (8) to look up procedure costs at specific facilities and see whether what you were billed is in the right ballpark.

Dispute inaccuracies

Ask your provider about their formal dispute process and follow the directions. If you don't get anywhere with the formal process (or if they claim not to have a formal process), send a certified letter outlining the specific charges you're disputing and why. Putting it in writing creates a paper trail and signals that you're serious.

Call your insurance company and your employer's HR department

You don't have to fight this alone. Your insurer has a financial interest in ensuring you (and they) are not overbilled, and many have dedicated teams to handle this process. If you receive benefits through your employer, HR may also have resources or advocates who can help.

Ask to talk to someone at the hospital or medical center

Call your hospital or provider, and specifically ask for the billing department, patient financial services, or a patient advocate. Patient advocates in particular are there to help navigate disputes and can often find resolutions that a standard billing rep cannot.

Medical fraud is a persistent problem, but even honest mistakes can lead to higher medical bills. To ensure you're not overpaying, pay close attention to bills and don't be afraid to ask questions.

Article Sources

We rely only on vetted sources and credible third-party reporting. For details, see our ethics and guidelines.

Temple University Center for Public Policy & Law (1); National Nurses United (2); Health Catalyst (3); National Health Care Anti-Fraud Association (4); U.S. Department of Health and Human Services Office of Inspector General (5); Patient Rights Advocate (6); Centers for Medicare & Medicaid Services (7); Hospital Pricing Files (8)