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 D90B4Z
Beam Radiation of Larynx using Photons >10 MeV
Beam Radiation of Larynx using Photons <1 MeV
Beam Radiation of Larynx using Neutron Capture
Beam Radiation of Larynx using Neutrons
Beam Radiation of Larynx using Electrons, Intraoperative
Beam Radiation of Larynx using Heavy Particles
Beam Radiation of Larynx using Photons 1 - 10 MeV
Beam Radiation of Larynx using Electrons