The Modality Qualifier Photons 1 is identified by number "1" and occupies the 5th position in the ICD10-PCS procedure code structure.
Below a selection of ICD 10 PCS codes related to D90B1
Beam Radiation of Larynx using Photons >10 MeV
Beam Radiation of Larynx using Neutrons
Beam Radiation of Larynx using Photons 1 - 10 MeV
Beam Radiation of Larynx using Electrons, Intraoperative
Beam Radiation of Larynx using Electrons
Beam Radiation of Larynx using Photons <1 MeV
Beam Radiation of Larynx using Heavy Particles
Beam Radiation of Larynx using Neutron Capture