CMOS-hybrid arrays have become competitive optical detectors for use in ground-and space-based astronomy. Inter-pixel capacitance is one source of error that appears in most CMOS arrays. In this paper we use a single pixel reset method to model inter-pixel capacitance (IPC). We combine this IPC model with a model for charge diffusion to estimate the total crosstalk on H4RG-10 arrays. Finally, we compare our model results to 55 Fe data obtained using an astrometric camera built to test the H4RG-10 B0 generation detectors.