Collaborative Stage

Note 1: Only include information from imaging and physical examination in this item. Do not include information on regional lymph nodes that is based on surgical observation or diagnostic lymph node biopsy.
Note 2: In the rare instance that the number of clinically positive nodes is stated but a clinical N category is not stated, code 1-3 nodes as 100 (N1), and 4 or more nodes as 200 (N2).
Note 3: If there is no diagnostic work-up to assess regional lymph nodes, use code 999. Do not apply the inaccessible nodes rule that presumes unmentioned nodes to be negative.

Code	Description
000	Nodes not clinically evident; imaging of regional nodes performed and nodes not mentioned
100	Metastasis in 1 - 3 regional lymph nodes, determined clinically Stated as clinical N1
200	Metastasis in 4 or more regional lymph nodes, determined clinically Stated as clinical N2
400	Clinically positive regional nodes, NOS
888	OBSOLETE DATA CONVERTED V0200 See code 988 Not applicable for this site
988	Not applicable: Information not collected for this case (May include cases converted from code 888 used in CSv1 for "Not applicable" or when the item was not collected. If this item is required to derive T, N, M, or any stage, use of code 988 may result in an error.)
999	Regional lymph node(s) involved pathologically, clinical assessment not stated Unknown if regional nodes clinically evident Not documented in patient record

CS Site-Specific Factor 2
Clinical Assessment of Regional Lymph Nodes