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National Cancer Data Base - Data Dictionary PUF 2015

UNKNOWN AND ILL-DEFINED PRIMARY SITES

C76.0–C76.8, C80.9 
(Except for M-9750, 9760–9764, 9800–9820, 9826, 9831–9920, 9931–9964, 9980–9989)
 
Code
98      All unknown and ill-defined disease sites, WITH or WITHOUT surgical treatment.
Surgical procedures for unknown and ill-defined primaries are to be recorded using the data item Surgical Procedure/Other Site (NAACCR Item #1294) or Surgical Procedure/Other Site at This Facility (NAACCR Item #674).