Aetna says surgery center firm is overbilling SANTA CLARA (AP) — Aetna has filed a $20 million lawsuit claiming a Northern California surgery center firm is overbilling the insurance carrier, including a $66,100 bunion repair, a $6,642 colonoscopy and a $23,301 knee arthroscopy. The Santa Clara County lawsuit claims the Saratoga-based Bay Area Surgical Management recruited dozens of doctors to invest in its seven outpatient facilities in a scheme to enrich doctors by sidestepping state laws meant to protect patients and control costs. Surgical Management was paid more than seven times the amounts charged by clinics performing equivalent procedures.