Per the BUMED Special Pays website (http://www.med.navy.mil/bumed/Special_Pay/Pages/default.aspx):
8 Sep 2015: The FY16 Medical Special Pays NAVADMIN 212/15 has been released. FY16 Special Pay requests can now be submitted in accordance with OPNAVINST 7220.16. Submit requests no earlier than 60 days prior to, and no later than 30 days after the effective date. Send ALL requests and questions to the email address listed below.
Templates for submission can be found here, although your Special Pays person in PSD usually can do this for you: