Section 412.258 - Parties to MGCRB proceeding(a) The party or parties to an MGCRB proceeding are the hospital or group of hospitals requesting a change in geographic designation.(b) CMS has 30 days from the date of receipt of notice of a complete application to submit written comments and recommendations (with a copy to the hospital) for consideration by the MGCRB.(c) The hospital has 15 days from the date of receipt of CMS's comments to submit written comments to the MGCRB, with a copy to CMS, for the purpose of responding to CMS's comments.