(a) A tribal employee enrolled under this subpart may increase or decrease his or her enrollment, or may change enrollment from one plan or option to another, as described in §890.301 (for tribal employees who did not elect premium conversion) or part 892 of this chapter (for tribal employees who did elect premium conversion).

(b) A change in enrollment type, plan, or option under this section becomes effective as described in §890.301 (for tribal employees who did not elect premium conversion) or part 892 of this chapter (for tribal employees who did elect premium conversion).