Okla. Stat. tit. 36, § 36-6092: Limitations on subrogation and set-off under medical

coverage.

No provision in an automobile liability policy or endorsement

for such coverage effective in this state issued by an insurer on

and after the effective date of this act which grants the insurer

the right of subrogation for payment of benefits under the expenses

for the medical services coverage portion of the policy, to a named

insured under the policy, or to any relative of the named insured

who is a member of the named insured's household shall be valid and

enforceable; provided, that such policy or endorsement may provide

for said insurer's rights of subrogation and set-off upon such

payments to any person who is not a named insured under the policy

or a relative of the named insured who is a member of the named

insured's household.