Perineural Invasion


**Note 1:** Physician statement of microscopically confirmed perineural invasion can be used to code this data item when no other information is available. **Note 2:** Code the presence or absence of perineural invasion by the primary tumor as documented in the pathology report. **Note 3:** Information on **presence** of perineural invasion can be taken from either a biopsy or resection. Absence of perineural invasion can only be taken from a surgical resection pathology report. **Note 4:** Code 9 if surgical resection of the primary site is performed and there is no mention of perineural invasion.




NAACCR #3909


Code Description
0 Perineural invasion not identified/not present
1 Perineural invasion identified/present
8 Not applicable: Information not collected for this case (If this information is required by your standard setter, use of code 8 may result in an edit error.)
9 Not documented in medical record Pathology report does not mention perineural invasion Cannot be determined by the pathologist Perineural invasion not assessed or unknown if assessed