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 D0005Z
Beam Radiation of Brain using Electrons
Beam Radiation of Brain using Electrons, Intraoperative
Beam Radiation of Brain using Neutron Capture
Beam Radiation of Brain using Photons >10 MeV
Beam Radiation of Brain using Photons <1 MeV
Beam Radiation of Brain using Neutrons
Beam Radiation of Brain using Heavy Particles (Protons,Ions)
Beam Radiation of Brain using Photons 1 - 10 MeV