Okla. Stat. tit. 11 § 14-113
When a defendant is in the custody of a municipal jail, the custodial municipality shall only be liable for the cost of medical care for conditions that are not preexisting prior to arrest and that arise due to acts or omissions of the municipality. Preexisting conditions are defined as those illnesses beginning or injuries sustained before a person is in the peaceable custody of the municipality's officers.
An inmate receiving medical care for a preexisting condition or a condition not caused by the acts or omissions of the municipality shall be liable for payment of the cost of care, including but not limited to, medication, medical treatment, and transportation costs, for or relating to the condition requiring treatment.
Okla. Stat. tit. 11, § 14-113