1. A computer-implemented method to improve the clinical accuracy of determinant level codes generated by medical priority dispatch systems, the method comprising: receiving at the computer system, from a medical priority dispatch system, one or more reported aspects collected from a caller who responds to questions asked by the dispatcher over a telephone, wherein the questions are provided to the dispatcher by the medical priority dispatch system and the reported aspects are relating to an emergency reported by the caller and are each one of the following: a sign, a symptom, and a condition; receiving at a computer system, from a medical priority dispatch system, a determinant level code selected by a dispatcher utilizing the medical priority dispatch system, the determinant level code representing a subset of the reported aspects; generating on the computer system a determinant level sub-code and pairing it with the determinant level code, wherein the determinant level sub-code is generated by the computer system based on the one or more reported aspects and represents a combination of all of the one or more caller reported aspects; comparing on the computer system the determinant level code and determinant level sub-code pair to other determinant level code and determinant level sub-code pairs to identify whether a situation involving the reported aspects is susceptible to introducing code hierarchy bias; and outputting from the computer system information resulting from the comparison of determinant level code and determinant level sub-code pairs that enables improvements to the clinical accuracy of the determinant level codes generated by the medical priority dispatch system.