(a) Notwithstanding subdivision (a) of Section 24209, and exclusive of any amounts payable during the prior retirement for service pursuant to Section 22714, or 22715:

1. (1) A member who retired, other than pursuant to Section 24210, 24211, 24212, or 24213, and who reinstates and performs creditable service, as defined in Section 22119.5, after the most recent reinstatement, in an amount equal to two or more years of credited service, shall, upon retirement for service on or after the effective date of this section, receive a service retirement allowance equal to the sum of the following:

   1. (A) An amount calculated pursuant to this chapter based on credited service accrued, including any service granted pursuant to Section 22717 or 22717.5, prior to the most recent reinstatement, using the member’s age at the subsequent service retirement, from which age shall be deducted the total time during which the member was retired for service, and final compensation.
   2. (B) An amount calculated pursuant to this chapter based on credited service accrued, including any service granted pursuant to Section 22717 or 22717.5, subsequent to the most recent reinstatement, using the member’s age on the last day of the month in which the retirement allowance begins to accrue, and final compensation.

2. (2) A member who retired pursuant to Section 24210 and who reinstates and performs creditable service, as defined in Section 22119.5, after the most recent reinstatement, in an amount equal to two or more years of credited service, shall, upon retirement for service on or after the effective date of this section, receive a service retirement allowance equal to the sum of the following:

   1. (A) An amount calculated pursuant to this chapter based on credited service accrued, including any service granted pursuant to Section 22717 or 22717.5, prior to the effective date of the disability retirement, using the member’s age at the subsequent service retirement, from which age shall be deducted the total time during which the member was retired for service, and indexed final compensation to the effective date of the initial service retirement.
   2. (B) An amount calculated pursuant to this chapter based on the credited service accrued, including any service granted pursuant to Section 22717 or 22717.5, after termination of the disability retirement, excluding credited service accrued or granted subsequent to the most recent reinstatement, using the member’s age at the subsequent service retirement, from which age shall be deducted the total time during which the member was retired for service, and final compensation.
   3. (C) An amount calculated pursuant to this chapter based on credited service accrued, including any service granted pursuant to Section 22717 or 22717.5, subsequent to the most recent reinstatement, using the member’s age on the last day of the month in which the retirement allowance begins to accrue, and final compensation.

3. (3) A member who retired pursuant to Section 24211 and who reinstates and performs creditable service, as defined in Section 22119.5, after the most recent reinstatement, in an amount equal to two or more years of credited service, shall, upon retirement for service on or after the effective date of this section, receive a service retirement allowance equal to the sum of the following:

   1. (A) The greater of (i) the disability allowance the member was eligible to receive immediately prior to termination of that allowance, excluding the children’s portion, or (ii) an amount calculated pursuant to this chapter based on credited service accrued prior to the effective date of the disability allowance, excluding credited service accrued or granted pursuant to Section 22717 or 22717.5 or Chapter 14 (commencing with Section 22800) or Chapter 14.2 (commencing with Section 22820) or Chapter 19 (commencing with Section 23200), using the member’s age at the subsequent service retirement, from which age shall be deducted the total time during which the member was retired for service, and final compensation using compensation earnable, or projected final compensation earnable, or a combination of both.

   2. (B) An amount equal to either of the following:

      1. (i) For a member who was receiving a benefit pursuant to subdivision (a) of Section 24211, an amount calculated pursuant to this chapter based on credited service accrued at the time of the retirement pursuant to Section 24211, excluding credited service accrued or granted prior to the effective date of the disability allowance or pursuant to Section 22717 or 22717.5 or Chapter 14 (commencing with Section 22800) or Chapter 14.2 (commencing with Section 22820) or Chapter 19 (commencing with Section 23200), the member’s age at the subsequent service retirement, from which age shall be deducted the total time during which the member was retired for service, and final compensation using compensation earnable, or projected final compensation, or a combination of both.
      2. (ii) For a member who was receiving a benefit pursuant to subdivision (b) of Section 24211, an amount calculated pursuant to this chapter based on projected service at the time of the retirement pursuant to Section 24211, excluding credited service accrued or granted prior to the effective date of the disability allowance or pursuant to Section 22717 or 22717.5 or Chapter 14 (commencing with Section 22800) or Chapter 14.2 (commencing with Section 22820) or Chapter 19 (commencing with Section 23200), the member’s age at the subsequent service retirement, from which age shall be deducted the total time during which the member was retired for service, and final compensation using compensation earnable, or projected final compensation, or a combination of both.
   3. (C) An amount based on any credited service accrued or granted pursuant to Section 22717 or 22717.5 or Chapter 14 (commencing with Section 22800) or Chapter 14.2 (commencing with Section 22820) or Chapter 19 (commencing with Section 23200), at the time of the retirement pursuant to Section 24211, using the member’s age at the subsequent service retirement, from which age shall be deducted the total time during which the member was retired for service, and final compensation using compensation earnable, or projected final compensation, or a combination of both.
   4. (D) An amount calculated pursuant to this chapter based on credited service accrued subsequent to the most recent reinstatement, including credited service accrued or granted pursuant to Section 22714, 22715, 22717, or 22717.5 or Chapter 14 (commencing with Section 22800) or Chapter 14.2 (commencing with Section 22820) or Chapter 19 (commencing with Section 23200), using the member’s age on the last day of the month in which the retirement allowance begins to accrue, and final compensation using compensation earnable, or projected final compensation, or a combination of both.

4. (4) A member who retired pursuant to Section 24212 or 24213 and who reinstates and performs creditable service, as defined in Section 22119.5, after the most recent reinstatement, in an amount equal to two or more years of credited service, shall, upon retirement for service on or after the effective date of this section, receive a service retirement allowance equal to the sum of the following:

   1. (A) An amount calculated pursuant to this chapter based on the member’s projected service at the time of the retirement pursuant to Section 24212 or 24213, including credited service accrued or granted pursuant to Section 22717 or 22717.5 or Chapter 14 (commencing with Section 22800) or Chapter 14.2 (commencing with Section 22820) or Chapter 19 (commencing with Section 23200), using the member’s age at the subsequent service retirement, from which age shall be deducted the total time during which the member was retired for service, and final compensation using compensation earnable, or projected final compensation, or a combination of both.
   2. (B) An amount calculated pursuant to this chapter based on credited service accrued subsequent to the most recent reinstatement, including credited service accrued or granted pursuant to Section 22714, 22715, 22717, or 22717.5 or Chapter 14 (commencing with Section 22800) or Chapter 14.2 (commencing with Section 22820) or Chapter 19 (commencing with Section 23200), using the member’s age on the last day of the month in which the retirement allowance begins to accrue, and final compensation using compensation earnable, or projected final compensation, or a combination of both.