1. A method performed by at least one computer processor executing computer program instructions tangibly stored on at least one non-transitory computer-readable medium, the method comprising: (A) identifying a document including a first coding having a first feature encoding a first concept, the first coding being associated with a first code; (B) rendering the first coding on an output device to have a visual characteristic that is based on the first feature, without rendering the first code; (C) receiving, via an input device, a first indication from a user of whether the rendering is accurate; (D) identifying, based on the first indication received from the user, a verification status of the first coding, wherein the verification status of the first coding indicates whether the first code represents the first concept, comprising: (D)(1) if the first indication indicates that the rendering is accurate, then identifying a verification status of the first coding indicating that the first coding is accurate; and (D)(2) otherwise, identifying a verification status of the first coding indicating that the first coding is inaccurate; and (E) if the verification status of the first coding indicates that the first coding is inaccurate, then modifying the first feature of the first coding to produce a modified first feature and storing a non-transitory record of the modified first feature.