Breast

Note 1: Record the results of only the immunohistochemistry (IHC) lab value for Human Epidermal Growth Factor Receptor 2 (HER2) in this field. The test determines if there is HER2 overexpression, or an excess amount of HER2 protein on the cell surface. The score is assigned by the pathologist based on the percentage and intensity of cell membrane staining.
Note 2: The same laboratory test should be used to record information in CS Site-Specific Factors 8 and 9.
Note 3: If the test is done but the actual score is not stated, code 997.
Note 4: If the test is not mentioned in the medical record, code to 999 unless there are circumstances under which the test isn't performed, for example no histologic specimen.

Code	Description
000	Score 0
001	OBSOLETE DATA CONVERTED V0203 See code 010 Score 1+
002	OBSOLETE DATA CONVERTED V0203 See code 020 Score 2+
003	OBSOLETE DATA CONVERTED V0203 See code 030 Score 3+
010	Score of 1+
020	Score of 2+
030	Score of 3+
988	Not applicable: Information not collected for this case (If this information is required by your standard setter, use of code 988 may result in an edit error.)
997	Test ordered, results not in chart
998	Test not done (test not ordered and not performed)
999	Unknown or no information Not documented in patient record

CS Site-Specific Factor 8HER2: Immunohistochemistry (IHC) Lab Value