The out of pocket cost for an in-network, insurance-based breast reduction is related to what insurance carriers refer to as the allowed amount. The allowed amount is a number the insurance company decides for each code that is billed by the doctor (there is a code to describe each type of medical procedure, including a specific code for a breast reduction). How the allowed amount for each code is derived is always a mystery but is based on your individual plan and the contract the insurance company has with your doctor. The allowed amount is what the doctor will be owed. If your insurance will pay 80% then you will owe 20% of the allowed amount to the doctor, but usually only up to your out of pocket expense. So, if the allowed amount is $1,000 then you're insurance company will pay $800 and you will owe $200 (if you haven't yet spent any out of pocket expenses this year). However, if the allowed amount were to be $40,000 then you would only owe $6,500 because that's your out of pocket maximum (even though it's less than $8,000, which is 20% of $40,000). However, if you have a deductible then you may still owe that outside of your out of pocket maximum. It's best to call your insurance company and ask. Best of luck,Keith M. Blechman, MDNew York, NY