The Treatment Site Rectum is identified by number "7" and occupies the 4th position in the ICD10-PCS procedure code structure.
Below a selection of ICD 10 PCS codes related to DD27
Stereotactic Gamma Beam Radiosurgery of Rectum
Stereotactic Other Photon Radiosurgery of Rectum
Stereotactic Particulate Radiosurgery of Rectum