A pen needle assembly apparatus (60) includes a housing (30), a movable support (40) for supporting a pen needle (18), an ejector (80) for ejecting a used pen needle from the support, and an actuator (56). The support (40) is rotated relative to the housing (30) to index the pen needles to a position where the pen needle can be accessed and coupled to a delivery device (10). The used pen needle (18) is returned to the well (42) in the support and the support rotated toward the ejector (80) where the used pen needle is ejected to a compartment (50) in the housing for disposal. A cover (60) on the housing includes at least one opening (65) for accessing the pen needle when the support is rotated to position a pen needle relative to the opening in the cover.