Okla. Admin. Code § 317:150-3-19
Dependent reaches age twenty-six [26]. Coverage will be terminated for dependents reaching age twenty-six [26] on the first [1st] day of the month following their twenty-sixth [26th] birthday, except disabled dependents who are incapable of self-support and who have been deemed eligible for coverage by EGID.
Added at 42 Ok Reg, Number 20, effective 7-11-25