Discordant Coverage Policies. Of the tests reviewed by more than one insurer, five tests had discordant coverage policies: the Allomap test for cardiac allograft rejection risk, the Mammaprint test for breast cancer risk recurrence, CYP2C19 testing for use of clopidogrel, and EGFR and KRAS testing for erlotinib. This evidence concerns the gene EGFR and breast carcinoma.