Medical necessity is used to describe care that is reasonable, necessary, and/or appropriate, based on evidence-based clinical standards of care.
According to Washington State law, "Medically necessary" is a term for describing requested service which is reasonably calculated to prevent, diagnose, correct, cure, alleviate or prevent worsening of conditions in the client that endanger life, or cause suffering or pain, or result in an illness or infirmity or threaten to cause or aggravate a handicap, or cause physical deformity or malfunction. There is no other equally effective, more conservative or substantially less costly course of treatment available or suitable for the client requesting the service. For the purpose of this section, "course of treatment" may include mere observation or, where appropriate, no treatment at all.
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