App. With CHI clinic for dermatologist. Removed a wart. Received bill for 1,300 for ER ! Took 2 months to correct. BUT Magically the bill amount remained the same ! LOL clinic billed me for the procedure , actually described what the DR preformed. I said to clinic YOU didn't make an incision ? Or stitch it up the DR did ! YOU provided a ROOM and supplies. You should charge just for supplies and a ROOM ! Still fighting it. PLUS the insurance calls them a preferred provider, yet does NOT make them take a dime off. BUT the Dr who performed the procedure was made to remove HALF his cost. User's recommendation: never use CHI clinics.