The Treatment Site Mediastinum is identified by number "6" and occupies the 4th position in the ICD10-PCS procedure code structure.
Below a selection of ICD 10 PCS codes related to DB26
Stereotactic Particulate Radiosurgery of Mediastinum
Stereotactic Gamma Beam Radiosurgery of Mediastinum
Stereotactic Other Photon Radiosurgery of Mediastinum