A multifunction oxygen mask comprises a mask body and a gas delivery adapter. A nasal chamber is formed in the upper portion of the mask body. An access aperture is formed through and adjacent to a lower portion of the mask body. The access aperture permits access to the mouth of a patient. The gas delivery adapter includes a first end coupled to a gas delivery adapter aperture of the mask body. An oxygen supply port radially extends outward from the gas delivery adapter. The oxygen supply port includes an external inlet portion, an outlet portion positioned within the gas delivery adapter, and a diverter member adjacent to the outlet portion. The diverter member is configured to direct a flow towards the first end of the gas delivery adapter. A meter-dose inhaler port radially extends outward from the gas delivery adapter. The gas delivery adapter includes a nebulizer port.
