Professional attendance of more than 15 minutes in duration, being the first in a course of attention, if the patient has a progressive disorder (excluding presbyopia) requiring comprehensive reassessment:(a) for a patient who is less than 65 years of age—within 36 months of an initial consultation to which this item or item 10905, 10907, 10910, 10913 or 10915 applies; or(b) for a patient who is at least 65 years of age—within 12 months of an initial consultation to which this item or item 10905, 10907, 10910, 10911, 10913 or 10915 applies