How do you read and check a medical bill?

Two documents arrive and they do different things. The explanation of benefits comes from your insurer and shows what the provider billed, what the insurer allowed under its negotiated rate, what it paid, and what portion is your responsibility. It is not a bill and paying from it is a common error. The bill comes from the provider and should match the patient responsibility figure on the EOB. When those two numbers disagree, that is the first thing to resolve, and it frequently means a claim was processed incorrectly or the provider billed before insurance adjudicated.

Request an itemized bill, since the summary statement most providers send first shows only totals. The itemized version lists each service with its billing code, and that is where errors become visible: duplicate charges for the same service, charges for services not received, incorrect quantities, room charges for days you were not there, and unbundling, where components of a procedure that should be billed under one code are billed separately at a higher total. Verify the codes against what actually happened, and check that your insurance information and the diagnosis codes are correct, since a wrong diagnosis code is a frequent cause of improper denial.

What to do when something is wrong. Call the provider's billing department with specifics and follow up in writing, and simultaneously contact your insurer if the issue is claim processing. Do not pay a disputed amount to make it stop, since payment complicates the dispute. Ask about financial assistance, which nonprofit hospitals are required to offer and which frequently extends well above the income levels people assume, and about prompt-pay discounts and interest-free payment plans, which most providers will grant on request. Check whether the charge is prohibited balance billing under the No Surprises Act. And be aware that medical debt under a threshold amount and recently paid medical collections have been removed from consumer credit reports under changes by the major bureaus, so an unpaid disputed bill carries less credit consequence than it once did, though the collection itself can still proceed.