A member who is retired on a disability retirement allowance pursuant to this section shall submit, at times to be selected by the commission but not more often than twice a year, to a physical examination by a physician or physicians designated by the commission; provided, however, that no member retired for disability whose total years of creditable service, including any period of disability retirement, equal 20 or more years and who shall have attained age 60 shall be required to submit to such physical examination. The physician or physicians shall report to the commission the physical condition of such member and if said report certifies that the member's condition has improved so that the member is no longer permanently disabled or if the member is engaged in an occupation, then the amount of the pension shall be reduced to an amount which, when added to the amount of the member's other earnings, shall not exceed the salary now attributable to the member's former position, but only after an opportunity is given such member to be represented by counsel at a hearing on the action by the commission.
N.J.S. § 43:13-22.55