Each HMO shall provide to each group and individual enrollee a written statement of benefit changes for the upcoming benefit year. The statement shall identify clearly and concisely those aspects of the proposed benefits plan which differ from the current benefits plan. Such notice should be provided as soon as available, but at least thirty (30) days prior to the date by which the group or individual enrollees must choose coverage. When an employer, rather than an HMO, requests changes for the upcoming benefit year that does not allow for a notification of at least thirty (30) days, the HMO shall provide notice as soon as reasonably possible.
Okla. Admin. Code § 365:40-5-22