The Isotope None is identified by letter "Z" and occupies the 6th position in the ICD10-PCS procedure code structure.
Below a selection of ICD 10 PCS codes related to D0011Z
Beam Radiation of Brain Stem using Electrons
Beam Radiation of Brain Stem using Photons 1 - 10 MeV
Beam Radiation of Brain Stem using Electrons, Intraoperative
Beam Radiation of Brain Stem using Photons <1 MeV
Beam Radiation of Brain Stem using Heavy Particles
Beam Radiation of Brain Stem using Neutron Capture
Beam Radiation of Brain Stem using Photons >10 MeV
Beam Radiation of Brain Stem using Neutrons