If you submitted an IMR request, ten you should have received a written response from the IMR provider through your PEBLO. Then, at that point, you could decide to submit a rebuttal if needed. You would then receive a response to the rebuttal- this response is called a surrebuttal.
Let's review these two means of contesting inaccuracies in the NarSum or simply updating it. An IMR request is used primarily when you are trying to add conditions to your IDES-referred list of disqualifying conditions to be considered by the PEB for your respective service. A rebuttal can be used to correct inaccuracies in the original NarSum- i.e., where the provider's write-up is mostly accurate, but some dates, test results, or symptoms are inaccurately recorded. It can also be used to reply to the IMR provider's response. However, in either case, there would be a written response that you should've received through your PEBLO. I will note that, on the EMEBR format used by the USAF and USN/USMC, some providers will simply type a short response into the block provided for such entries in the EMEBR. So, if you are in one of these services, I would actually check the final EMEBR NarSum carefully, as you may already have your answer in that document. However, most of the time, there will be a separate written document explaining the provider's rationale in more detail .