nonavailability statement
non·a·vail·a·bil·i·ty state·ment
(non'ă-vāl'ă-bil'i-tē stāt'mĕnt)A statement issued by the base commander to a Tricare (q.v.) patient that allows such patient or dependent to go off the base for treatment even though less than 40 miles from a military treatment facility (catchment area).
Medical Dictionary for the Health Professions and Nursing © Farlex 2012