Specialists can cost a LOT depending on who you need to see, how frequently, surgeries required, etc.
My friend had his appendix burst, and delayed going to the hospital out of ignorance of knowing wtf that feels like in comparison to food poisoning (which he never had before). The cost without his insurance coverage? The cost of a house. A nice one. Over 100,000$ USD for the hospital stay, surgical procedures, tests, examinations, medications, consults, etc. He paid 900$ out of pocket for the whole thing.
American health costs suck unless you have a free way out and are generally healthy.
But to keep the scare factor down, many places will make you pay a rate for a visit. Visiting the doctor alone might not cost a ton.. they have specialists that will let you visit them for $40-150 a visit depending on who and what. Without tests and procedures though, little will be done... For a minor issue (like a foot issue for example needing a special insole to relieve back pain) I could see a doctor visit a few times, an order for a device from a third-party-online-offer and all that reasonably come out with only paying $500 or so for some visits and tests and the device. But still that's a good chunk of money for a foot.