Your last chance to make changes to your Tricare, FEDVIP coverage is Dec. 14 December 11, 2020 The deadline to make changes to your Tricare coverage is Dec. 14. Shown here, Capt. Manisha Mills, a 49th MDOS pediatrician, checks her patient s heart rate March 29, 2017 at Holloman Air Force Base, N.M. (Airman 1st Class Ilyana A. Escalona/Air Force) The deadline for making changes to your Tricare plan, and to your federal vision and dental plan coverage is Dec. 14. The open season period is the only time each year when you can enroll in or make changes to these health care plans, except for a qualifying life event such as marriage, birth and retirement. The coverage takes effect Jan. 1, 2021.