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 D7021Z
Beam Radiation of Spleen using Photons >10 MeV
Beam Radiation of Spleen using Photons <1 MeV
Beam Radiation of Spleen using Heavy Particles
Beam Radiation of Spleen using Neutrons
Beam Radiation of Spleen using Electrons
Beam Radiation of Spleen using Electrons, Intraoperative
Beam Radiation of Spleen using Photons 1 - 10 MeV
Beam Radiation of Spleen using Neutron Capture