Emergency room billing errors occur in 92% of ER claims—a significantly higher rate than the 80% error rate across all hospital bills—and commonly include duplicate facility fees, incorrect service level coding, and charges for services never provided. These mistakes can cost you hundreds or thousands of dollars beyond what your insurance should actually cover, but most are fixable if you catch them. The most frequent errors fall into two categories: hospitals billing multiple facility fees when you move between departments during a single visit, and billing you for a higher level of service than you actually received. You have the right to dispute incorrect charges and request an itemized bill, and federal law limits how much you can be charged for out-of-network emergency services.
Table of Contents
- The Most Common ER Billing Mistakes
- How Coding Errors Inflate Medicare Bills
- What Errors to Look for on Your ER Bill
- Disputing Errors and Asserting Your Rights
- Surprise Billing Protection and When It Applies
- Insurance Claim Denials and How to Appeal
- Frequently Asked Questions
The Most Common ER Billing Mistakes
Duplicate facility charges are the single largest category of ER error. When you move from the waiting room to a treatment bay to imaging and back, hospitals often bill a separate facility fee for each location—even though these are all part of one emergency visit. The Texas HHS Office of Inspector General identified this as a widespread practice in hospital billing audits.
Upcoding—billing for a higher level of service than you received—is equally common. If you had a simple evaluation and basic lab work, you may be charged as though you received advanced diagnostics or a higher complexity assessment. According to the Texas HHS analysis, hospitals frequently bill service levels that do not match what was actually documented in your medical record.
How Coding Errors Inflate Medicare Bills
Medicare has caught billions in incorrect ER coding that most commercial insurers never detect. In a recent audit, Medicare found that physicians were improperly paid $922,524 for 9,749 procedures billed as emergency services when they should have been coded differently, according to the U.S. HHS Office of Inspector General. Hospitals made similar mistakes, with Medicare potentially overpaying $14.2 million for claims using emergency department codes paired with non-emergency billing codes. Across all billing—not just ER—the improper payment rate for evaluation and management codes is 10.3%, projected at $3.9 billion annually, with incorrect coding responsible for 49.1% of those errors.
What Errors to Look for on Your ER Bill
When you receive your itemized ER bill, you should see: Up to 49% of medical bills contain at least one error, according to the Consumer Financial Protection Bureau, so reviewing the itemized details is worth your time. Request a fully itemized bill if the one you received is abbreviated—hospitals must provide it upon request, and many errors hide in the absence of detail.
- A single facility charge for the emergency department visit, not multiple charges for each area you were treated in
- A description of what tests or procedures were actually performed, matching what you remember and what your discharge summary says
- No charges for medications you remember being told about but not receiving or for procedures that were discussed but never done
- A clear breakdown between the hospital facility charge and the physician charge (these come from separate bills)
Disputing Errors and Asserting Your Rights
If you find an error, you have documented legal rights. Federal law requires you to provide formal notice of the disputed charge, and the provider then has a specific time to respond. If a debt collector later contacts you, you can demand they validate the debt within 30 days—and many debts based on double-billed services or fake charges cannot be validated.
Start by sending a written dispute letter to the billing department (keep a copy for your records). Explain which charges are incorrect and why, referencing the itemized bill. If the hospital claims the charges are correct but cannot explain them with documentation from your medical record, you have grounds to refuse payment. The CFPB has found that debt collectors violate federal law by pursuing double-billed services and inflated amounts, so a collector should not be pursuing charges you have properly disputed.
Surprise Billing Protection and When It Applies
Not all high ER bills are errors—sometimes they are surprise billing, where the hospital or a physician in the ER is out of network. The No Surprises Act, effective since 2022, prohibits out-of-network emergency providers from balance-billing you above your in-network cost-sharing amount for emergency services. This means you cannot be charged extra because the ER doctor or hospital was not in your insurance plan.
If you receive a bill for more than you would pay if the provider were in-network, check whether this protection applies. The ER doctor and the hospital are typically separate billing entities, and both fall under surprise billing protections. You can ask the hospital's billing department whether they are in-network with your insurance; if not, ask them to apply the in-network rate. If they refuse, contact your state insurance commissioner or your insurance company's appeals department—they have authority to enforce this rule.
Insurance Claim Denials and How to Appeal
You may never see an ER bill at all if your insurance simply denies the claim. Insurance companies are rejecting approximately 31% of emergency department claims, nearly triple the rate from a few years prior, according to the American College of Emergency Physicians. Common denial reasons include coding mismatches or the insurer arguing the visit was not a true emergency.
Do not accept a denial without appeal. Request a detailed explanation of why the claim was denied, and ask the hospital's billing department to appeal on your behalf—they have better documentation than you do. If the denial stands, you have the right to file your own appeal to your insurance company, and you can involve your state insurance commissioner if the company refuses to reconsider. Most initially denied ER claims can be overturned with proper documentation showing why the emergency care was necessary.
Frequently Asked Questions
Can a hospital charge me a separate facility fee each time I move to a different area of the ER?
No—one facility fee covers your entire emergency department visit, even if you move between areas. Multiple facility charges are a common error you should dispute.
What should I do if the hospital bill lists a procedure I never had?
Request an itemized bill and compare it to your discharge summary. Then send a formal written dispute explaining which charges do not match your medical record, keeping a copy for your records.
If my insurance denies my ER claim, do I have to pay the full bill?
Not necessarily. Request a detailed denial reason and ask the hospital to appeal. If the appeal fails, you have the right to request your own appeal through your insurance company.
Does the No Surprises Act cover emergency room visits?
Yes—you cannot be balance-billed above your in-network cost-sharing amount for emergency services, even if the provider is out of network.