According to UnitedHealthcare, the average cost of an ER visit in the U.S. for someone who is uninsured is $2,200. Uninsured patients are looking at a general range of $150 to $17,000 for an ER visit depending on the severity of illness and treatment required. This does not include additional expenses like testing, lab fees, and even an ambulance ride, which can cost about $400 to $1,200. With insurance, the average cost of an ER visit can be paid with a co-pay of $150 to $900. Even when facing a large ER bill, your insurance may be responsible for covering part or most of your visit depending on your deductible.