A description is given of a field-to-wire coupling model enhancement to the Intrasystem Electromagnetic Compatibility Analysis Program (IEMCAP), along with a comparison of the enhanced and previous versions of IEMCAP. The previous model incorporates a bounding algorithm based on transmission line theory. High frequencies or large distances above the ground plane cause the transmission line model to break down. This motivated the enhancement to handle field-to-wire coupling from 1 to 40 GHz. This new model incorporates the results of experimental shielding measurements performed in a mode tuned reverberation chamber and method-of-moments calculations. The algorithms have been implemented in a modular manner and provide a smooth transition with the previous low-frequency IEMCAP predictions. Comparisons between the previous field-to-wire results and the enhanced algorithm results show that the new field-to-wire calculations are much less conservative. However, they match well with measured data. The new version of IEMCAP provides four new options: an out-of-band representation of port termination impedance, a user-selected flag for the presence of an exposed center conductor, a statistical confidence factor flag, and wire propagation characteristics.<<ETX>>