Based on price transparency data published by Tampa area hospitals, the negotiated rates give you a baseline for what hospitals actually accept as payment. BayCare negotiates rates of $12,915 with Blue Cross Blue Shield and $14,853 with Aetna for knee replacement. HCA Florida shows even wider variation, with Blue Cross Blue Shield at $9,962 and Aetna at $29,886.
These aren't the uninsured rates, but they tell you what hospitals accept from insurance companies. If a hospital takes $12,915 from Blue Cross, that's the neighborhood where you start negotiating your cash rate.
Medicare pays both hospital systems $1,288 for the same procedure. That's the actual cost of providing the service. Everything above that is markup, and markup is always negotiable for cash-pay patients.