Reg LN Pos: Breast Cancer

Note 1: Record this field even if there has been preoperative treatment.

Note 2: Lymph nodes with only isolated tumor cells (ITCs) are NOT counted as positive lymph nodes. Only lymph nodes with metastases greater than 0.2mm (micrometastases or larger) should be counted as positive. If the pathology report indicates that nodes are positive but size of the metastases is not stated, assume the metastastases are > 0.2mm and code the lymph nodes as positive in this field.

Note 3: Record all positive regional lymph nodes in this field. Record the number of positive regional axillary nodes separately in the appropriate Site-Specific Factor field.

Code Description
00 All nodes examined negative.
01-89 1 - 89 nodes positive (code exact number of nodes positive)
90 90 or more nodes positive
95 Positive aspiration of lymph node(s)
97 Positive nodes - number unspecified
98 No nodes examined
  • Unknown if nodes are positive; not applicable
  • Not documented in patient record
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