AI and Inflated Hospital Bills: How to Check Your Bill and Protect Yourself

In late September 2026, a headline made the rounds: “Hospitals Used AI To Inflate Medical Bills By Nearly $1,000,000,000, Report Finds.” If you’ve ever opened a hospital bill and wondered whether it was right, that headline probably hit a nerve.

The good news: you don’t need to understand artificial intelligence to protect yourself. You need to know how to read your bill, what to ask for, and whom to call. This guide walks you through how to dispute a hospital bill, step by step, and what to do if the bill is correct but still more than you can pay.

What the report actually found

The headline comes from an analysis by the Blue Cross Blue Shield Association (BCBSA), the national association of Blue Cross and Blue Shield insurance companies. It was released September 24, 2026, alongside a white paper titled Hospital Coding Intensity Analysis: Major Bowel Procedures.

Here’s what it measured:

• Timeframe: Blue plan claims data from 2023 through 2025.
• Main finding: Hospitals billed more inpatient stays as “medically complex” over that period. BCBSA estimates this added about $942 million in costs for Blue companies over two years.
• Where the money came from: About 70% (more than $650 million) came from secondary diagnoses, such as anemia or low sodium, that moved a hospital stay into a higher-paying billing category. Many of these can be picked up from a single lab result.
• The key example: After major bowel surgery, hospitals with the fastest coding growth recorded more anemia, but patients didn’t receive more transfusions. BCBSA reads that gap as more billable conditions, not sicker patients.
• The AI link: BCBSA notes that more than 60% of hospital systems now use AI coding tools that scan records and lab results for diagnoses.

What it did not show

This is an insurer association’s analysis of its own members’ costs. It is not a government audit or a court finding. According to healthsystemCIO’s review, it used claims data without reviewing patient charts. That means it doesn’t show that any particular diagnosis was false, and it doesn’t prove AI caused the increase. The American Hospital Association disputes the conclusion, saying patients are older and sicker and that AI helps document real conditions.

It’s also worth noting that the $942 million is what insurers paid. It is not a total of overcharges on individual patients’ bills.

What this means for you

AI can help doctors document real diagnoses that might otherwise be missed. That’s legitimate. But any diagnosis or charge that isn’t supported by your medical record deserves a second look, whether a person or software added it.

You don’t have to prove AI was involved to question a bill. You only have to ask the hospital and your insurer to show that what you were billed matches the care you received.

Five things to understand before you dispute a bill

1. Charges, allowed amounts, and what you actually owe

Term	What it means	Simple example
Hospital charge	The hospital’s full list price, before insurance	An MRI listed at $3,000
Allowed amount	The price your insurer has agreed to pay an in-network provider for a covered service	The plan’s contracted rate for that MRI is $1,100
Network adjustment	The difference an in-network provider writes off	$1,900 shown as a discount on your EOB
Deductible	What you pay for covered care before your plan starts sharing costs	If you haven’t met your deductible, you may owe the full $1,100
Coinsurance	Your percentage share after the deductible	20% of $1,100 = $220
Patient responsibility	The total you owe, according to your insurer	Deductible + copays + coinsurance + anything not covered

Numbers are illustrative only.

2. An EOB is not a bill

Your Explanation of Benefits (EOB) comes from your insurer. It shows what the provider charged, what the plan allowed and paid, and what you may owe. Your bill comes from the hospital or doctor. When a claim is finished processing, the amount on your bill should generally match the “patient responsibility” on your EOB.

3. Common medical billing errors

• Coding errors: The wrong procedure or diagnosis code was entered.
• Duplicate charges: The same item or service appears twice.
• Services not received: A medication, supply, or test you never got.
• Unsupported diagnoses: A condition is listed that your medical record doesn’t support.
• Upcoding: A service or level of complexity is billed higher than what was documented and delivered.

4. Expensive isn’t the same as wrong

An accurate bill reflects care you actually received, coded to match your record and processed under your plan’s rules. It can still be large, especially early in the year before you’ve met your deductible. An incorrect bill has a mismatch somewhere. The fix is different: errors get corrected, while accurate-but-unaffordable bills call for the assistance options covered later in this guide.

5. Your out-of-pocket maximum has limits

On ACA-compliant plans, the out-of-pocket maximum caps what you pay for covered, in-network care in a plan year. According to HealthCare.gov, it does not include your premiums, services your plan doesn’t cover, out-of-network care, or amounts above the allowed amount that a provider may charge.

Some types of coverage, such as short-term, fixed indemnity, or other limited-benefit plans, may have different limits or none at all. Access to a PPO network, by itself, doesn’t mean a plan provides comprehensive coverage. Check your plan documents to see what protections actually apply.

How to dispute a hospital bill: an 8-step action plan

Work through these steps in order. Most billing questions get resolved in the first five. Throughout, don’t ignore bills, collection notices, or appeal deadlines while you wait for answers. Call to let the billing office know you’re reviewing the bill.

Step 1: Gather your documents

Pull together the bill, the matching EOB, your insurance card, any cost estimate you received, your discharge summary, and letters or emails from the hospital or insurer. Start a simple call log: date, person’s name, department, reference number, and what was said.

Step 2: Request an itemized hospital bill

Contact: The hospital’s billing or patient financial services office (the number is on your statement).

Request: A fully itemized bill showing each service date, quantity, procedure or revenue code, and a plain description of each charge. For a hospital stay, ask which diagnoses were billed. Under HIPAA, you can also request copies of your medical and billing records to compare against the bill.

Keep: The itemized bill and a note of when you asked for it.

Step 3: Compare the bill with your EOB

Check that:

• The amount you’re billed matches “patient responsibility” on the EOB.
• Network discounts were applied and any insurance payment is credited.
• The claim has finished processing. If the EOB shows “pending,” you may not owe the final amount yet.
• Dates, quantities, and services match what you remember and what your records show.

Mark anything that looks off: a duplicate, a service you didn’t receive, or a diagnosis you don’t recognize.

Step 4: Ask the hospital for a coding review

Contact: The billing office. Ask that your account be reviewed by the coding or billing compliance team.

Request: A review of the specific line items or diagnoses you flagged. Ask them to confirm each is supported by your medical record and coded accurately. You’re not asking for special treatment, only for accurate coding.

Keep: A reference number and the name of the person who opened the review.

Step 5: Contact your insurer

Contact: The member services number on your insurance card.

Request: Ask whether the claim was processed correctly, whether the in-network rate was applied, and whether anything was denied and why. If the hospital corrects an error, ask whether it needs to submit a corrected claim.

Keep: The call reference number, the representative’s name, and the date.

Step 6: Put your dispute in writing

Follow up your calls with a short letter or portal message listing the specific charges you’re disputing and why. Ask the hospital to confirm in writing whether it will place the account on a billing or collection hold during the review. Not every dispute automatically pauses billing, so get the answer in writing. Keep copies of everything you send and receive.

Step 7: Appeal an insurance denial, if that’s the problem

A hospital billing dispute challenges what the hospital charged. An insurance appeal challenges how your plan decided a claim, such as a denial. They’re separate processes.

For many plans, you have 180 days from a denial to file an internal appeal, and you may then be able to request an independent external review. Deadlines and review rights depend on your plan type and the issue, so follow the instructions in your denial letter.

Step 8: Escalate if it’s still unresolved

Match the route to your coverage and the type of problem:

Your situation	Where to turn
Hospital won’t respond or resolve a billing dispute	The hospital’s patient advocate or patient relations office
Ongoing or complex care with many claims	Your insurer’s case manager
Individual/family plan or fully insured employer plan	Your state department of insurance
Self-funded employer plan	Your employer’s benefits administrator, then the U.S. Department of Labor’s EBSA at 1-866-444-3272
Surprise billing or a Good Faith Estimate problem	The CMS No Surprises Help Desk at 1-800-985-3059
A complicated or high-dollar case	An independent medical billing advocate (ask about fees and scope first)

Not sure whether your employer plan is fully insured or self-funded? Ask your HR or benefits administrator.

Legal protections, and where they stop

Some protections below are legal rights. Others, like negotiating a discount, are voluntary options a hospital may or may not offer. It helps to know which is which.

The No Surprises Act

The federal No Surprises Act protects people with most private health plans from surprise out-of-network bills in three main situations:

• Most emergency care, even at an out-of-network hospital or freestanding ER.
• Non-emergency care from out-of-network providers at an in-network facility, such as an out-of-network anesthesiologist at your in-network hospital.
• Out-of-network air ambulance services.

In these cases, you generally can’t be billed more than your in-network cost-sharing.

The law has limits. It doesn’t make every unexpected or expensive bill illegal, and it doesn’t address in-network billing accuracy. It generally does not cover ground ambulance services under federal law, though some states have their own ambulance protections. According to an Arizona legislative fact sheet citing state regulators, it also doesn’t extend to short-term plans, critical illness policies, or other limited-benefit plans.

If you think the law applies and wasn’t followed, contact the No Surprises Help Desk at 1-800-985-3059.

Good Faith Estimates (uninsured and self-pay patients)

If you’re uninsured, or you choose not to use your insurance for a service, providers must give you a written Good Faith Estimate when you schedule care or ask for one. According to CMS, if your final bill from any one provider or facility is at least $400 more than its estimate, you may be able to use the federal patient-provider dispute resolution process.

You must start that process within 120 calendar days of the date on the original bill, and there’s a small administrative fee. While the dispute is pending, the provider can’t send that bill to collections and must pause late fees.

This process isn’t a general appeal option for insured patients. If you used your insurance, it generally won’t apply. The exception is a service your plan doesn’t cover, or one you chose to pay for yourself.

Nonprofit hospital financial assistance (Section 501(r))

Many U.S. hospitals are nonprofits. To keep their federal tax exemption, Section 501(r) of the tax code requires them to have a written financial assistance policy and to limit what they charge eligible patients.

They also must make reasonable efforts to see whether you qualify for assistance before taking extraordinary collection actions, such as reporting you to credit bureaus, selling your debt, or suing. The IRS describes a 120-day notification period and a 240-day application period, both counted from the first bill after discharge.

Insured patients can qualify under many hospitals’ policies. Eligibility rules, income limits, and discount levels vary by hospital. For-profit and government hospitals follow different rules, though many have their own assistance programs.

State protections vary

Many states add protections on top of federal law, but they usually apply only to plans the state regulates. Self-funded employer plans generally fall under federal law instead.

An Arizona example: Arizona runs a Surprise Out-of-Network Billing Dispute Resolution program through its Department of Insurance and Financial Institutions. It’s free for consumers, but eligibility is narrow. The plan must be regulated by Arizona, the bill must be at least $1,000, and the request must be filed within one year of the service date. HMO plans and self-funded employer plans don’t qualify. Outside Arizona, check your own state insurance department for similar programs.

If the bill is accurate but you can’t afford it

A correct bill can still be a hardship. Before you pay with a credit card or sign up for medical financing, look at these options. Results vary, and no option guarantees a reduction.

• Apply for financial assistance or charity care. Ask the hospital for its financial assistance policy and application. Apply even if you have insurance, and ask whether assistance can cover your deductible and coinsurance.
• Ask about hardship or income-based help. If your income dropped or you have large medical costs this year, explain that. Self-employed income can swing, so ask how the hospital calculates it and what documents it accepts.
• Ask about discounts and negotiate in writing. Some hospitals offer a prompt-pay or lump-sum discount. If you reach an agreement, get it in writing before you pay, including that the balance will be considered paid in full.
• Request a payment plan. Ask for an affordable monthly amount and whether the plan is interest-free. Get the terms in writing.
• Check every separate bill. Physicians, anesthesiologists, radiologists, and labs often bill separately from the hospital. The hospital’s assistance policy may not cover them, so ask each one about its own options.
• Consider a reputable patient advocate. For complex or large bills, an independent medical billing advocate can help. Ask about fees, what they’ll do, and how they’re paid before you sign anything.

Why it pays to check first: Once a hospital bill is on a credit card or medical financing product, it becomes a debt to a lender. That can make hospital assistance and discounts harder to apply, and interest may add up. Some medical credit cards also charge deferred interest if the balance isn’t paid in full by the end of a promotional period.

One more caution: don’t drop your insurance to qualify for a cash-pay discount. One discount isn’t worth losing protection for the next medical event.

Two copy-and-paste scripts

Use these on the phone or in a written message. Fill in the brackets, keep your tone friendly, and write down who you spoke with.

Script 1: Hospital billing office

Hello, my name is [Your name]. I’m calling about account number [#] for services on [date(s)].

First, please send me a fully itemized bill showing each charge with its date, quantity, procedure or revenue code, and description. For an inpatient stay, please also list the diagnoses that were billed.

I’ve compared my bill with my insurance EOB, and I’d like to dispute these charges: [line item, date, amount], because [it appears twice / I didn’t receive this / I don’t see this in my records].

Please ask your coding or billing compliance team to review these items and confirm they’re supported by my medical record and coded accurately.

While the review is in progress, can you place my account on hold so it isn’t sent to collections? Please confirm that in writing.

Please also send me your financial assistance policy and application.

May I have a reference number and your name? When should I expect to hear back?

Script 2: Your insurance company

Hello, my name is [Your name], member ID [#]. I’m calling about claim number [#] from [provider] for services on [date].

Can you walk me through the EOB? I’d like to understand what was billed, the allowed amount, and how my share was calculated.

Was this processed as in-network, and was the network discount applied?

Is this claim final, or is it still pending or being adjusted?

Was anything denied or not covered? If so, what’s the reason?

If the hospital corrects a billing or coding error, does it need to submit a corrected claim, and will you reprocess it?

If I decide to appeal, what’s my deadline, where do I send it, and is external review available? Can you send me the appeal instructions in writing?

May I have a call reference number?

How to protect yourself before planned care

For scheduled surgery, imaging, or a hospital stay, a few calls ahead of time can prevent many billing problems:

1. Confirm network status. Check that the facility and the main providers are in your plan’s network, including the surgeon, anesthesia group, radiology, and lab if you can find out. Ask your insurer, not just the provider’s office.
2. Check coverage and prior authorization. Ask your insurer whether the service is covered and whether it needs prior authorization. Confirm who is responsible for requesting it.
3. Get a written estimate. Ask the provider for an estimate, and use your insurer’s cost estimate tool if it has one. If you’re uninsured or self-pay, request a Good Faith Estimate.
4. Understand exclusions and limits. Review your plan documents for exclusions, visit limits, and how your deductible and out-of-pocket maximum apply.
5. Save reference numbers. Write down the date, the representative’s name, and the reference number for every call.

Keep in mind that network participation and prior authorization help, but they don’t guarantee payment. A claim can still be denied or adjusted later.

In an emergency, get care first. Never delay emergency treatment to check prices or network status. Federal law provides protections for most emergency care, and billing questions can be sorted out afterward.

You should have someone you can call when a bill doesn’t make sense

Most people choose a health plan once a year and don’t think about it again until a confusing bill arrives. That’s exactly when it helps to have a licensed agent who knows your plan and picks up the phone.

At 1099 Health Insurance, we see service after enrollment as part of the job. A good agent can help you:

• Understand what your plan covers and how your deductible, coinsurance, and out-of-pocket maximum work.
• Read an EOB line by line and spot what doesn’t match your bill.
• Figure out which questions to ask, and whether the issue is a billing error, a claim decision, or an accurate but expensive bill.
• Organize your documents and reference numbers.
• Find the right department or agency to contact, and understand your next steps.

It’s also important to be clear about limits. An agent can’t control how a hospital codes your care, decide claims, override plan exclusions, or guarantee that a bill will be reduced. For privacy reasons, your insurer may need you on the call or a signed authorization before it will discuss your claim with anyone else.

What an agent can do is make sure you’re not figuring it out alone. And when it’s time to renew, the bills you’ve had can help you choose coverage that fits how you actually use care.

A hypothetical example

This example is illustrative only. The person, numbers, and outcomes are invented to show how the process works. They are not a real client’s experience.

Dana is a self-employed contractor with an individual health plan. After outpatient surgery at an in-network hospital, her EOB shows a patient responsibility of $1,240. A month later, the hospital’s statement says she owes $1,690. That’s $450 more.

Here’s what Dana does:

1. She calls the billing office, explains she’s reviewing the bill, and asks whether the account can be put on hold while she does.
2. She requests an itemized bill. She finds a $450 charge she can’t match to her EOB, plus a diagnosis she doesn’t recognize.
3. She calls her insurer. The representative confirms the surgery claim is final and processed in-network, with her share at $1,240.
4. She sends the hospital a short written dispute listing the $450 charge and the diagnosis, with her call reference numbers, and asks for a coding review.

This could end one of two ways:

• Outcome A, a correction: The billing team finds the $450 was a duplicate of a supply already on the claim. It removes the charge and sends a corrected statement for $1,240.
• Outcome B, an explanation: The billing team explains the $450 is a separate lab service billed on its own claim, which was still processing. Its EOB arrives a week later and confirms Dana’s share. The coding team points to her chart showing the diagnosis was documented and treated. The bill is accurate, so Dana applies for financial assistance and asks for an interest-free payment plan.

Either way, Dana pays once she understands what she owes. Reviewing a bill doesn’t automatically lower it, but it helps make sure you’re paying the right amount.

Hospital bill review checklist

• Gather the bill, EOB, insurance card, estimates, and discharge summary
• Start a call log with dates, names, and reference numbers
• Request an itemized bill with codes, dates, and quantities
• Confirm the claim is final, not pending
• Match your bill to “patient responsibility” on the EOB
• Look for duplicates, services not received, and unfamiliar diagnoses
• Ask the hospital for a coding review of specific items
• Ask your insurer whether the claim was processed correctly and in-network
• Put your dispute in writing and request a written billing hold
• Note any appeal deadlines from denial letters
• Ask for the financial assistance policy and application
• Check separate physician, anesthesia, radiology, and lab bills
• Escalate to the right agency if the issue isn’t resolved

Frequently asked questions

Can I qualify for hospital financial assistance if I have insurance?

Often, yes. Many hospital financial assistance policies cover insured patients, including help with deductibles and coinsurance. Eligibility depends on the hospital’s written policy, your income, and sometimes your household size or medical expenses. Ask for the policy and apply.

Does the No Surprises Act apply to every medical bill?

No. It mainly protects people with most private health plans from surprise out-of-network bills for emergency care, certain care at in-network facilities, and air ambulances. It generally doesn’t cover ground ambulances, limited-benefit plans, or in-network billing errors. Those need the dispute steps above.

What should I do if my bill goes to collections?

Don’t ignore it. Contact the collection agency in writing to dispute the debt and ask for validation; federal law generally gives you 30 days after you receive the collector’s validation notice to do this. Also contact the hospital directly to explain your dispute and ask whether you can still apply for financial assistance. Nonprofit hospitals must follow Section 501(r) rules before taking extraordinary collection actions. The major credit bureaus have said they don’t report paid medical collections or those under $500, and some states add more protections.

Do I need to prove AI was involved to question my bill?

No. You only need to ask that the charges and diagnoses on your bill be supported by your medical record and coded accurately. How a code got there doesn’t change your right to ask.

Should I pay the bill while I’m disputing it?

Consider paying the part you agree you owe, or setting up a payment plan, while you dispute the rest. Ask the hospital in writing to hold the disputed amount during review. If you file a No Surprises Act complaint, CMS notes you’re still responsible for the amount your EOB says you owe.

How long do I have to dispute a hospital bill?

There’s no single deadline. It depends on the issue. Insurance appeals often must be filed within 180 days of a denial, the Good Faith Estimate dispute process has a 120-day window, and nonprofit hospitals must accept financial assistance applications for at least 240 days after the first post-discharge bill. Act as soon as you spot a problem.

Have questions about your coverage or a bill?

If a bill doesn’t line up with your EOB, or you’re not sure what your plan covers, you don’t have to sort it out alone. 1099 Health Insurance works with self-employed professionals, 1099 contractors, and families in 32 states. We can help you understand your coverage and prepare the right questions before you call the hospital or your insurer.

Schedule a free consultation or call or text (833) 833-1099.

This article is for general education and isn’t legal, tax, or medical advice. Rules vary by plan type and state. Review your plan documents and contact the appropriate agency for guidance on your situation.

Last reviewed: October 4, 2026