Abstract: In a system with a display and an input device, a graphical user interface (GUI) may be presented via the display. A natural language understanding engine may be applied to a free-form text documenting a clinical patient encounter, to automatically derive one or more engine-suggested medical billing codes, which may be presented in the GUI. User input may be accepted to approve at least one of the engine-suggested codes and/or to enter one or more user-added codes in the GUI, resulting in a set of user-approved codes. The set of user-approved codes may be automatically correlated to a diagnosis related group (DRG) for the patient encounter, which may be displayed. In response to user input changing the set of user-approved codes by approving or removing approval of an engine-suggested code in the GUI, the DRG may be automatically updated, and the updated DRG for the patient encounter may be displayed.