I have been getting denials from Medicare for hyperbaric treatments (99183) that are diagnosed with 909.2 which is Late Effects of Radiation, comparable to 990 (Effects of Radiation). I have already submitted redeterminations for these with only 1 date of service coming back as favorable (apparently someone else processed this one). My next step is to submit a reconsideration but I am wondering if this is worth my time or could I use 990 and rebill instead? Is there a time frame between it being considered a "Late Effect"? We have thousands of dollars of treatments wrapped up in this between 2 patients, please help!