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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.