In an example, configuring an implantable medical device by determining port usage can include, receiving a port data object, determining a lead configuration, configuring access to a programmable parameter, and displaying a visual indication of the lead configuration. The port data object can be received from the implantable medical device and can include data associated with a port of the implantable medical device capable of connecting to a lead. The determining a lead configuration can be based on the port data object. The configuring access to a programmable parameter can be based on the lead configuration of the implantable medical device.