Our crossmatch maintenance is built for phases IS, 37 degree, and AHG and CC. We enter reaction results for only the phases that we test and ND (not done) for the ones that we don't. This allows us to use the test XM for any type of testing performed. I believe that there are CPT codes for IS, 37 degree and AHG phases but I am not at work and can't check my CPT code book.