10 United States Code (USC) Section 1079(a)(13)
provides that TRICARE may only pay for medically necessary care.
This statute has been implemented by the Code of Federal Regulations
(
32 CFR 199.4), which states that TRICARE will
pay for “medically necessary services and supplies required in the
diagnosis and treatment of illness or injury.” Therefore, TRICARE
can cost-share only medically necessary supplies and services. Services
that are not medically necessary are specifically excluded from
TRICARE coverage.