Docketing. When a valid rate application is received, as per the above regulations, it shall be entered on the Commission docket and a file opened. Each rate application shall be given an annual docket number and a consecutive page number in the docket. Each rate application shall be given a consecutive file number. A regular rate application file number shall be noted “R”. The file number of an order authorizing Commission investigation and review of established rates shall be noted “C”. A temporary rate application file number shall be noted “I”. An alternative method of rate determination application file number shall be noted “A”. A rate application file number by a new hospital or a hospital with expanded facilities or new revenue centers shall be noted “N”. The date of receipt of the rate application shall be noted on the docket and on the file. Upon request of the hospital, the Commission shall give the hospital a receipt for the rate application filing, showing the docket, page, and file numbers, and the date of receiving the rate application. The hospital shall file an original and three copies of each rate application and its supporting documents, if any. The Commission may prescribe the format to be used in the submission of rate applications and their supporting documents. In addition, the hospital shall file with each rate application a certificate of service indicating that the application and supporting documents have been mailed or served upon all designated parties to that proceeding and upon the Commission at its offices.