It's not that you don't code...you need to code to stay relevant. It's that you shouldn't code serious production features/issues. As a manager, you're context switching constantly and it's very difficult to achieve the necessary quality. You'll never get the uninterrupted time necessary to do anything big. 5-10 min fixes are good targets for a manager, as are projects that would otherwise distract the team, like spikes on potential new technology. You should use your coding to further your overall goal of keeping your team focused and you should limit your coding so that all the major accomplishments of the team belong to the team members and not the manager.