Are free clinics really free? and can i walk to one if i hold insurance?

i want to go to a free clinic, but i need to know if they'll except you if you own insurance. and are they really free?
"> I imagine it depends on the clinic. But I believe they usually take down your insurance information and bill them but waive your co-payment. But I have an idea that that sometimes they are income based and you cannot use them unless you are in their low income bracket. But at hand may be some that don't ask.


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