Okla. Stat. tit. 63 § 3101.9
An attending physician or other health care provider who is unwilling to comply with the Oklahoma Advance Directive Act shall as promptly as practicable take all reasonable steps to arrange care of the declarant by another physician or health care provider when the declarant becomes a qualified patient. Once a patient has established a physician-patient relationship with a physician or a provider-patient relationship with another health care provider, if the physician or other health care provider refuses to comply with a medical treatment decision made by or on behalf of the patient pursuant to the Oklahoma Advance Directive Act, or with a medical treatment decision made by such a patient who has decision-making capacity, and if the refusal would in reasonable medical judgment be likely to result in the death of the patient, then the physician or other health care provider must comply with the medical treatment decision pending the completion of the transfer of the patient to a physician or health care provider willing to comply with the decision. Nothing in this section shall require the provision of treatment if the physician or other health care provider is physically or legally unable to provide or is physically or legally unable to provide without thereby denying the same treatment to another patient. Nothing in this section may be construed to alter any legal obligation or lack of legal obligation of a physician or other health care provider to provide medical treatment, nutrition, or hydration to a patient who refuses or is unable to pay for them.
Okla. Stat. tit. 63, § 3101.9