Mo. Rev. Stat. § 190.613: Out-of-state order, physician may execute order, when.

1. A patient or patient's representative and the patient's attending physician may execute an outside the hospital do-not-resuscitate order through the presentation of a properly executed outside the hospital do-not-resuscitate order from another state, the District of Columbia, or a territory of the United States, or a Transportable Physician Orders for Patient Preferences (TPOPP)/Physician Orders for Life-Sustaining Treatment (POLST) form containing a specific do-not-resuscitate section.

2. Any outside the hospital do-not-resuscitate form identified from another state, the District of Columbia, or a territory of the United States, or a TPOPP/POLST form, shall:

(1) Have been previously reviewed and approved by the department as in compliance with the provisions of sections 190.600 to 190.621;

(2) Not be accepted for a patient under eighteen years of age, except as allowed under section 191.250; and

(3) Not be effective during such time as the patient is pregnant as set forth in section 190.609.

A patient or patient's representative may express to emergency medical services personnel, at any time and by any means, the intent to revoke the outside the hospital do-not-resuscitate order.

3. The provisions of section 190.606 shall apply to the good faith acts or omissions of emergency medical services personnel under this section.