(a) Type of enrollment. A former spouse who meets the requirements of § 890.803 may elect coverage for self only, self plus one, or self and family. A self and family enrollment covers only the former spouse and all eligible children of both the former spouse and the employee, former employee, or employee annuitant, provided such children are not otherwise covered by a health plan under this part. A self plus one enrollment covers only the former spouse and one eligible child of both the former spouse and the employee, former employee, or employee annuitant, provided the child is not otherwise covered by a health plan under this part. A child must be under age 26 or incapable of self-support because of a mental or physical disability existing before age 26. No person may be covered by two enrollments.

(b) A child is considered to be the child of the former spouse or the employee, former employee, or employee annuitant if he or she is—

(1) A natural child; or

(2) An adopted child.

(c) Child incapable of self-support. When a former spouse enrolls for a family enrollment which includes a child who has become 26 years of age and is incapable of self-support, the employing office shall determine such child's eligibility in accordance with § 890.302(c), (d), and (e).