I may have found my answer... after a google search I found this..
http://wiki.answers.com/Q/Is_there_a_Secti...ing_a_plan_yearExample 10. (i) Employer Y maintains a calendar year cafeteria plan under which full-time employees may elect coverage under either an indemnity option or an HMO. Employee C elects the employee-only indemnity option. During the year, C marries D. D has two children from a previous marriage, and has family group health coverage in a cafeteria plan sponsored by D's employer, Z. C wishes to change from employee-only indemnity coverage to HMO coverage for the family. D wishes to cease coverage in Z's group health plan and certifies to Z that D will have family coverage under C's plan (and Z has no reason to believe the certification is incorrect).
(ii) The marriage is a change in status under paragraph (c)(2)(i) of this section. Under the consistency rule in paragraph (c)(3) of this section, Y's cafeteria plan may permit C to change his or her salary reduction contributions to reflect the change from employee-only indemnity to HMO family coverage, and Z may permit D to revoke coverage under Z's cafeteria plan.
However, I would really like to read it from the actual regs rather than a website. Does anyone have a link to the full S1.125-4 regs?