Okla. Stat. tit. 36, § 6060.17
A. The trustee or custodian shall utilize the funds held in a health savings account solely for the following purposes:
2. To purchase a health coverage policy certificate, or contract, if the eligible individual:
B. Funds held in a health savings account shall not be used to cover expenses of the eligible individual or their dependents that are otherwise covered, including, but not limited to, medical expenses covered by the following:
Laws 2005, HB 1848, c. 306, § 4, eff. November 1, 2005.