Okla. Admin. Code § 317:150-5-40
Members who are eligible for Medicare will be assumed to be enrolled in both Parts A and B of Medicare. Benefits payable under the Medicare Supplement will be determined in accordance with this assumption. The Medicare Supplement is either connected with a Medicare Part D Prescription Drug Plan or contains pharmacy benefits that are considered creditable coverage by Medicare.
Added at 42 Ok Reg, Number 20, effective 7-11-25