(

a) An annuitant who reinstates from retirement pursuant to

Article 7 (commencing with

Section 21190) of

Chapter of Part may, upon his or her subsequent retirement, elect to enroll in a health benefit plan approved or maintained by the board as an annuitant of the employer from which he or she was eligible to receive a postretirement health benefit contribution payable by that employer during his or her prior retirement, if both of the following apply:

(1) The subsequent retirement of that person occurs within days after separation from employment or, if applicable, consistent with the provisions of subdivision (

b) of

Section 22893.

(2) That person is not eligible for a postretirement health benefit contribution from the employer from which he or she subsequently retires or the postretirement health benefit contribution payable by that employer is less than the contribution payable by that employer during his or her prior retirement. (

b) The postretirement health benefit contribution payable by an employer under this

section shall be in lieu of a contribution payable to the annuitant by any other employer under this part. (

c) For purposes of calculating the employer postretirement health benefit contribution, the credited service of a person who enrolls as an annuitant pursuant to this

section shall not include service performed for any other employer during his or her reinstatement from retirement. (

d) This

section shall apply irrespective of whether the person receives health care coverage under this part during his or her reinstatement from retirement. (

e) An annuitant who is eligible to enroll pursuant to this

section may enroll within days after his or her subsequent retirement or during a future open enrollment period, as provided by regulation of the board, without discrimination as to premium rates or benefits coverage. (

f) This

section shall only apply to an annuitant who, after reinstatement, subsequently retires on or after January 1, 2014.