Okla. Stat. tit. 63, § 63-1-2504.1: Duty to act - Mutual aid - Exemption

A. There is a required duty to act within the licensed area

upon the acceptance of an ambulance service license. All licensed

ambulance services shall respond appropriately, consistent with the

level of licensure, when called for emergency service regardless of

the patient’s ability to pay.

B. If the ambulance service cannot physically respond within

the limits of the Ambulance Service Districts Act, then the

ambulance service called shall immediately call for mutual aid from

a neighboring licensed ambulance service. Nonemergency,

interfacility transfers are exempt from the requirements of this

subsection.