This paper deals with the modeling of a Hansen's disease (HD) affected nerve using FEM based simulation tool. There exists an exponential delay in the propagation of action potential for a diseased nerve as compared to a healthy one. To include this exponential delay, the FitzHugh Nagumo equation has been modified and modeled using COMSOL Multiphysics 4.0a. Time domain and frequency domain analyses help in a better diagnosis of the disease. The simulation results are promising and the systematic exposition discussed in this paper will be useful for the diagnosis of Hansen's disease. © 2005 - 2013 JATIT & LLS. All rights reserved.