When patients from our optometry practice are diagnosed with cataracts they are referred to a surgeon. Following surgery the patient returns to our optometry practice for postoperative management only. We see the patient anywhere from 1-3 weeks postop. The surgeon provides us with a transfer of care letter with the information that we need to bill. We bill the same cataract code as the surgeon, with a modifier -55. If the patient is having both eyes done, they will return again for postoperative management of the second eye. When the patient is seen for postop visits for the second eye, should I use modifier -55 as well as -79 because the patient is in a global period from the first surgery? Does our optometry office need to base our fee on the number of postop days that we are treating the patients? How do we know what 20% of the charge is? The surgeons do not share the fee with us. Thank you.