Ask Dr. Z

I know that Z01.818 is sometimes used for mapping encounters, like mapping prior to creation of a dialysis fistula. I code for a hospital cath lab where the IVR doctors perform cath placements into the liver and inject MAA radioactive albumin into a hepatic artery. After patient leaves the cath lab a Y-90 simulation study is performed (77290). Then sometime later the actual Y-90 treatment is performed. Should I be using Z01.818 as the primary DX code for these MAA injection encounters, with the HCC code C22.0 as secondary?