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 D9031Z
Beam Radiation of Hypopharynx using Heavy Particles
Beam Radiation of Hypopharynx using Neutrons
Beam Radiation of Hypopharynx using Electrons, Intraop
Beam Radiation of Hypopharynx using Neutron Capture
Beam Radiation of Hypopharynx using Photons >10 MeV
Beam Radiation of Hypopharynx using Photons <1 MeV
Beam Radiation of Hypopharynx using Photons 1 - 10 MeV
Beam Radiation of Hypopharynx using Electrons