Investigation of the vestibular function to assist in the diagnosis, treatment or management of a vestibular or related disorder, performed by or on behalf of a medical practitioner: (a) to assess one or more of the following: (i) the organs of the peripheral vestibular system (utricle, saccule, lateral, superior and posterior semicircular canals, and vestibular nerve); (ii) muscular or eye movement responses elicited by vestibular stimulation; (iii) static signs of vestibular dysfunction; (iv) the central ocular‑motor function; and (b) using 3 or 4 clinically recognised tests; other than a service associated with a service to which item 11015, 11021, 11024, 11027 or 11205 applies