Modular, prefabricated insulating concrete forms and methods for fabricating such forms are presented herein. In one aspect, a reinforced cement based coating is disposed over at least the top, bottom, and outward facing surfaces of insulating foam cores comprising two sidewalls of a modular, prefabricated insulating concrete form (ICF). In a further aspect, a cement based finish coating is disposed over a portion of the reinforced cement based coating located over an outward facing surface of a sidewall of the ICF. In another aspect, at least a portion of the top and bottom surfaces of the sidewalls are disposed at an angle with respect to the outward facing surfaces of the sidewalls such that the sloped portions of the bottom and top surfaces are parallel. In this manner, multiple ICFs interlock when stacked on top of one another.