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 D90D1
Beam Radiation of Nasopharynx using Photons 1 - 10 MeV
Beam Radiation of Nasopharynx using Electrons
Beam Radiation of Nasopharynx using Photons >10 MeV
Beam Radiation of Nasopharynx using Heavy Particles
Beam Radiation of Nasopharynx using Neutrons
Beam Radiation of Nasopharynx using Photons <1 MeV
Beam Radiation of Nasopharynx using Electrons, Intraop
Beam Radiation of Nasopharynx using Neutron Capture