DHS 107.17(2)(a)(a) Definition. In this subsection, “spell of illness” means a condition characterized by a demonstrated loss of functional ability to perform daily living skills, caused by a new disease, injury or medical condition or by an increase in the severity of a pre-existing medical condition. For a condition to be classified as a new spell of illness, the recipient must display the potential to reachieve the skill level that he or she had previously. DHS 107.17(2)(b)(b) Requirement. Prior authorization is required under this subsection for occupational therapy services provided to an MA recipient in excess of 35 treatment days per spell of illness, except that occupational therapy services provided to an MA recipient who is a hospital inpatient or who is receiving occupational therapy services provided by a home health agency are not subject to prior authorization under this subsection. DHS 107.17 NoteNote: Occupational therapy services provided by a home health agency are subject to prior authorization under s. DHS 107.11 (3). DHS 107.17(2)(c)(c) Conditions justifying spell of illness designation. The following conditions may justify designation of a new spell of illness: