Records the date non-sentinel regional node dissection was performed. This data item is required for CoC-accredited facilities as of cases diagnosed 01/01/2018 and later. 

It is a known fact that sentinel lymph node biopsies have been under-reported. Additionally, the timing and results of sentinel lymph node biopsy procedures are used in quality of care measures. This data item can be used to more accurately assess the date of regional node dissection separate from the date of sentinel lymph node biopsy if performed.