In addition to program catalogues and the internet, other resources are also valuable in choosing a school. Talk to faculty members, colleagues, and those in your school and teaching community for recommendations. Do you know other students who have enrolled in a master's program in piano pedagogy? Certainly do not limit yourself to one resource, but rather use each resource as a catalyst to get your search rolling.
Meyers, A. (2014). Choosing a master's degree program in piano pedagogy. Clavier Companion, 6(5), 52-58.