Every dollar you knock off the bill is a dollar you never pay interest on, and medical bills move more than almost any other kind. Start with an itemized statement and check each line, because billing errors are common enough that reviewing the codes is worth an hour of your time. If you are uninsured or the procedure is out of network, ask for the self-pay rate, which often runs well below the billed amount. If you have an HSA or FSA, spend it before borrowing anything, since those are pre-tax dollars.
Then ask about financial assistance, even if you assume you earn too much. Nonprofit hospitals, which is most US hospitals, must maintain written financial assistance policies as a condition of their tax exemption; the IRS sets out those obligations in its rules for
charitable hospitals. Many reduce or forgive bills for patients earning under 200% to 400% of the federal poverty level, and you can usually apply even after a bill has gone to collections. Steps like these can turn a $15,000 bill into a $7,000 one, which changes how much financing you need at all.