(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).