Usage

In AJCC terminology, examples of N categories include ‘ycN0’, for post-therapy clinical staging indicating no evidence of lymph node involvement, and ‘pN1’, indicating regional lymph node involvement to a small extent, with specific thresholds for the lymph node groups and number of lymph nodes involved. Other N categories refer to increasing lymph node involvement. Please note allowable N categories may vary between clinical, pathologic, and other classifications, and the N category prefix must align with Observation.code. The full set of allowable clinical, pathologic, and other (recurrence/retreatment/autopsy) N categories, along with current descriptions, can be accessed through the AJCC Staging Manual and any applicable updates and corrections, as well as the AJCC API.

This value set includes codes based on the following rules:

• Include codes from http://snomed.info/sct where concept descends from 1222588006 (null)
• Include codes from http://snomed.info/sct where concept descends from 1222590007 (null)
• Include codes from http://snomed.info/sct where concept descends from 1222596001 (null)

This value set contains 59 concepts