What to do when a medical bill arrives

First, separate the bill from the explanation of benefits

An explanation of benefits, often called an EOB, is the insurer’s account of how a claim was processed; it is usually marked “not a bill.” A provider bill requests payment. Compare patient name, date of service, facility, individual professionals, service descriptions or codes, amount charged, plan discount, insurer payment, and patient responsibility. One visit may generate separate bills from the facility, physician, laboratory, radiologist, pathologist, or ambulance.

Create one folder for the EOB, every bill version, receipts, referral or authorization, network screenshots, discharge papers, and notes from calls. Date each note and include the person or department, callback number, reference number, what was promised, and the next deadline.

• CMS health-insurance terms

Use a five-question error check

Ask: Was this the correct patient and date? Did I receive every listed service? Was the claim sent to the correct insurer and member number? Did the plan apply the expected network status, authorization, deductible, and copay? Does the provider bill equal the patient responsibility shown on the latest EOB? Request an itemized bill and a plain-language explanation of unfamiliar codes. Do not post protected medical or account information publicly while seeking help.

If the claim was denied or processed unexpectedly, ask the insurer for the exact reason and the plan document that controls it. Ask whether the provider must correct and resubmit the claim, whether the insurer can reprocess it, or whether you must file an appeal. Get the filing address or portal and deadline in writing.

Practical example: an unexpected emergency professional bill

A patient used an in-network hospital emergency department but later receives a separate out-of-network clinician bill. The patient compares the bill with the EOB, confirms that the plan is employer or individual coverage, calls the insurer to ask how federal surprise-billing protections were applied, and asks the clinician’s billing office to pause collection activity while the charge is reviewed. The patient does not simply pay or discard it. Whether the law applies depends on the service, coverage, date, and circumstances.

Federal protections cover many emergency services and certain out-of-network services received at an in-network facility, and generally limit the patient to in-network cost sharing. Ground ambulance charges are generally outside the federal No Surprises Act. State law may add protections.

• CMS medical-bill rights

Escalate in a documented order

Start with the provider’s billing office and insurer. If a network listing was inaccurate, preserve a dated screenshot and your verification notes. Follow the plan’s internal appeal instructions and submit evidence through a trackable channel. Ask who handles an external review, state insurance complaint, or employer-plan issue if the internal decision remains adverse. For questions about federal surprise-billing protections, CMS offers the No Surprises Help Desk at 1-800-985-3059 and an online complaint path.

If you are uninsured or chose not to use insurance and the final bill is at least $400 above a qualifying good faith estimate, a federal patient-provider dispute process may be available. Different rules and deadlines apply, so use the current CMS instructions rather than relying on a general summary.

• CMS: get help with a medical bill

If the amount is correct but unaffordable

Ask for the organization’s written financial-assistance policy, eligibility application, interest-free payment options, and a statement showing any discount. Tax-exempt charitable hospital organizations covered by IRS Section 501(r) must maintain written financial-assistance policies, but eligibility varies. Negotiate before agreeing to financing, and ask how a pending application affects collections. Never share bank credentials or make payment through a link you cannot independently verify.

• IRS: hospital financial-assistance policies