District of Columbia Code Division V. Local Business Affairs § 31-3841.01. Definitions.

(1) “Health insurer” means a person that provides one or more health benefit plans or insurance in the District of Columbia, including an insurer, a hospital and medical services corporation, a fraternal benefit society, a health maintenance organization, a multiple employer welfare arrangement, or any other person providing a plan of health insurance subject to the authority of the Commissioner of the Department of Insurance, Securities, and Banking.

(2) “Open enrollment period” means the yearly period during which a person can enroll in a health insurance plan.

(3) “Special enrollment period” means any time a person has the option to enroll in or change their health insurance outside of the open enrollment period.