Digital pass verification systems and methods are disclosed herein. One or more servers are to distribute instructions on a network. The instructions, when executed, cause a first device carried by a person to at least: access a result of a diagnostic test performed on the person, the result provided by a second device; generate a machine-readable code in response to the result being negative; and display the machine-readable code on a display of the first device to enable the person to gain access to a location.