(a) A member who is not vested for service retirement beginning on or before the date the member attains age 60 and who has applied for disability retirement is eligible to receive a disability retirement annuity if the member is the subject of a certification issued as provided by Section 844.303(b)(1).
(b) A member who is vested for service retirement based on service in this system alone beginning on or before the date the member attains age 60 and who has applied for disability retirement is eligible to receive a retirement annuity if the member is the subject of a certification issued as provided by Section 844.303(b)(2).
(c) If a member who has filed an application for disability retirement under this subchapter is eligible for service retirement, an evaluation by the medical board under Section 844.303 will not be made and the retirement system shall consider the retirement application as an application filed for service retirement.