Collaborative Stage Data Set - Revised 07/28/2010 FINAL
| Code | Description |
| 00 | No nodes examined |
| 01-89 | 1 - 89 nodes examined (code exact number of regional lymph nodes examined) |
| 90 | 90 or more nodes examined |
| 95 | No regional nodes removed, but aspiration or core biopsy of regional nodes performed |
| 96 | Regional lymph node removal documented as sampling and number of nodes unknown/not stated |
| 97 | Regional lymph node removal documented as dissection and number of nodes unknown/not stated |
| 98 | Regional lymph nodes surgically removed but number of lymph nodes unknown/not stated and not documented as sampling or dissection; nodes examined, but number unknown |
| 99 | Unknown if nodes were examined; not applicable or negative Not documented in patient record |