Does NCD trump LCD guidelines or does LCD trump NCD? For example, NCD 220.6 states that they will not cover FDG PET imaging for subsequent anti-tumor treatment strategy for tumor types other than breast, colorectal, esophagus, head and neck (non-CNS/thyroid), lymphoma, melanoma, non-small cell lung, and thyroid, unless the FDG PET is provided under CED. However, our LCD L32663 (New Mexico) states that you can bill with 155.0 Liver, primary but we are receiving denials for this combination.