A Varian 2100C 18 MV photon beam has been modeled in this work using the MCNP5 Monte Carlo particle transport user code. The subsequent beam irradiation was also delivered to a water phantom and benchmarked against experimentally measured depth dose data. The model presented in this work establishes the foundation to which further beam characteristics tuning is required in order to realistically model the beam mentioned above. It has been determined in this work that the initial electron beam energy of this beam model is sufficiently close to the electron beam energy from the linear accelerator used to obtain the benchmark depth dose data.