Behavior Code (BehaviorCode)
Behavior Code ICD-O-3
Field Length: 1
Record the behavior of the tumor being reported. The fifth digit of the morphology code is the behavior code.
Instructions for Coding
- Code 3 if any invasion is present, no matter how limited.
- If the specimen is from a metastatic site, code the histology of the metastatic site and code 3 for behavior
- Gastro-intestinal stromal tumors (GIST) and thyomas are frquently non-malignant. However, they must be abstracted and assigned a Behavior Code of 3 if they are noted to have multiple foci, metastasis, or positive lymph nodes.
Note: The ICD-O-3 behavior code for juvenile astrocytoma (9421/1) is coded as 3. Refer to the section "Case Reporting Requirements."
Uncertain whether benign or malignant
Uncertain malignant potential
In situ and/or carcinoma in situ
Adenocarcinoma in an adenomatous polyp with no invasion of stalk
Clark level 1 for melanoma (limited to epithelium)
Comedocarcinoma, noninfiltrating (C50._)
Synonymous with in situ
Confined to epithelium
Hutchinson melanotic freckle, NOS (C44._)
Involvement up to, but not including the basement membrane
Lentigo maligna (C44._)
Lobular neoplasia (C50._)
Lobular, noninfiltrating (C50._)
No stromal involvement
Papillary, noninfiltrating, or intraductal
Precancerous melanosis (C44._)
Queyrat erythroplasia (C60._)
AIN III (C21.1)
LIN III (C32.0-C32.9)
SIN III (squamous intraepithelial neoplasia)
VAIN III (C52.9)
VIN III (C51._)
Bowen disease (not reportable for C44._)
Invasive or microinvasive