Hello! I would recommend calling GEHA and letting them know that there is no banding date scheduled yet, as the patient would like to wait to begin tx until they receive an insurance estimate, hence your office submitting the pre-auth, so the patient can determine their estimated financial responsibility prior to beginning orthodontic tx. When speaking with GEHA, you can let them know that the proposed ortho tx duration is approximately (XX months), and the patient will be seen every (x weeks/months) for adjustment visits, per the treatment plan. I would recommend clarifying again that the banding date is currently TBD, pending GEHA's insurance determination and the pt's decision to proceed. I would also recommend submitting a letter of medical necessity from the provider outlining the treatment plan if you have not submitted this already :)