Tennessee Code Title 56. Insurance § 56-7-3706

(a) If a prior authorization is required for a healthcare service for the treatment of a chronic condition of an enrollee, then the prior authorization remains valid for at least six (6) months, from the date the healthcare professional or provider receives the prior authorization approval, unless the clinical criteria as specified in § 56-7-3707 state otherwise.

(b) If prior authorization is required for a prescription drug for the treatment of a chronic condition of an enrollee, then the prior authorization remains valid for at least six (6) months from the date the healthcare professional or provider receives the prior authorization approval, unless the clinical criteria as specified in § 56-7-3707 state otherwise.

(c) This section does not apply to the requirements of a prior authorization for the prescription of a schedule II, III, IV, or V drug. However, notice must be given to the healthcare provider pursuant to this section if prior authorization is or may be required for a schedule II, III, IV or V drug.

(d) This section does not require a policy of health insurance coverage to cover care, treatment, or services for a health condition that the terms of coverage otherwise completely exclude from the policy's covered benefits without regard for whether the care, treatment, or services are medically necessary.

(e) This section does not apply to inpatient services.