A patient had surgery with 90 day global, CPT 67210 in his left eye on 6/23/2016. On 6/28/16, he had the same surgery again, 67210 with 79 modifier because it was done in his right eye. Then on 8/9/16, he had an intravitreal injection, 67028, in his left eye. For the injection, would we use a 79 modifier or a 58 modifier? Do we go by the original surgery or the latest surgery?