Histology Coding Rules: Colon/Rectum
Use a combination code for:
Bladder: Papillary and urothelial (transitional cell) carcinoma (8130)
Breast: Paget Disease and duct carcinoma
c. Breast: Duct carcinoma and lobular carcinoma (8522)
d. Thyroid: Follicular and papillary carcinoma (8340)
Rule 4 is not applicable to colon/rectum. This rule is used only for carcinomas of the bladder, breast, and thyroid.