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 D9006Z
Beam Radiation of Ear using Photons <1 MeV
Beam Radiation of Ear using Photons 1 - 10 MeV
Beam Radiation of Ear using Electrons
Beam Radiation of Ear using Neutrons
Beam Radiation of Ear using Heavy Particles (Protons,Ions)
Beam Radiation of Ear using Electrons, Intraoperative
Beam Radiation of Ear using Photons >10 MeV
Beam Radiation of Ear using Neutron Capture