The Ein Mishpat commentary notes where the topic in Mishna or Gemara is referenced in the Rambam or Tur/Shulchan Aruch (other relevant question here).
Is there a work that reverses the order with the same information - e.g. listing the Rambam in order and which mishnayos and gemaros are referenced?
Alternatively, has anyone complied the Ein Mishpat topics in a spreadsheet, where you could easily sort by one column or the other?