This invention describes an allogenomics mismatch scoring method that estimates the genomic incompatibility between potential organ donors and a transplant recipient. The allogenomics method addresses immunological concerns and compares genotype information from matched, or potential, donors and recipients. The allogenomics method uses genomic data available before transplantation and predicts kidney graft function for greater than three years after transplantation. The strength of the inverse correlation between pre-transplantation genomic mismatches and transplant organ function increases with the time after transplantation: a low allogenomics mismatch score correlates with better acceptance and function of a donor transplant over time.