The Treatment Site Thymus is identified by number "1" and occupies the 4th position in the ICD10-PCS procedure code structure.
Below a selection of ICD 10 PCS codes related to D721
Stereotactic Particulate Radiosurgery of Thymus
Stereotactic Gamma Beam Radiosurgery of Thymus
Stereotactic Other Photon Radiosurgery of Thymus