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 D90F4Z
Beam Radiation of Oropharynx using Electrons, Intraoperative
Beam Radiation of Oropharynx using Electrons
Beam Radiation of Oropharynx using Neutron Capture
Beam Radiation of Oropharynx using Photons <1 MeV
Beam Radiation of Oropharynx using Photons >10 MeV
Beam Radiation of Oropharynx using Neutrons
Beam Radiation of Oropharynx using Photons 1 - 10 MeV
Beam Radiation of Oropharynx using Heavy Particles