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UNOFFICIAL 1700.1-61 “Student” means a child under age nineteen years enrolled in a public or private elementary, secondary school, or in a program of an equivalent level of vocational or technical training, or officially released by the department of education and being provided an education in the home, and a child under eighteen years of age attending a post secondary institute, such as a college, vocational school, or technical trade institute. “Sub-acute” means a level of care that is needed by an individual not requiring acute care, but who needs more intensive skilled nursing care than is provided to the majority of patients in a skilled nursing facility. “Sub-acute unit” is a facility that provides care as defined in section 17-1737-116, that is needed by an individual not requiring acute care, but who needs more intensive skilled nursing care than is provided to the majority of individuals in a nursing facility. “Subrogation” means the substitution of one creditor for another, along with transference of the claims and rights of the old creditor. “Substance abuse” means excessive use of substances that alter or impair consciousness. “Substitute direct nursing component” means adjusting the direct nursing care component used to obtain a basic PPS rate for an acuity level as follows: (1) Increasing the facility-specific level A direct nursing component by dividing that component by the acuity ratio; or (2) Decreasing the facility-specific level C direct nursing component by multiplying it by the acuity ratio; (3) In calculating the substitute direct nursing component, the acuity ratio shall be applied to the provider's direct nursing component prior to the application of the direct nursing component ceiling. “Surveillance” means the process of monitoring the delivery and utilization of covered services and items of the beneficiaries and includes the use of