Histology (Pre-2007)/Multiple Primaries (Pre-2007)--Breast: What code is used to represent histology for a case with a biopsy specimen that reveals "infiltrating ductal carcinoma with ductal carcinoma in situ, comedo subtype, non-extensive" in one quadrant of the breast and a mastectomy specimen with "invasive pleomorphic lobular carcinoma with lobular carcinoma in situ" in another quadrant of the breast? Paget disease is identified in the nipple section.
Histology (Pre-2007)--Breast: What code is used to represent histology for "invasive ductal carcinoma with squamous differentiation"? Is "squamous differentiation" synonymous with "squamous metaplasia"?
Histology (Pre-2007)--Melanoma: What code is used to represent the histology "radial growth phase: melanoma, superficial spreading type; vertical growth phase: epithelioid type"? See discussion.
Date of Diagnosis/Histology (Pre-2007): How should we code these fields for "atypical fibroxanthoma" of the left cheek diagnosed in October 1999 that is followed by a June 2000 punch biopsy with a microscopic description in the pathology report of "superficial form of malignant fibrous histiocytoma"? See discussion.
Histology (Pre-2007)/Grade, Differentiation: What code is used to represent the histology of "well differentiated low grade lipoma-like liposarcoma (atypical lipoma)"? See discussion.
Histology (Pre-2007)/Grade, Differentiation--All Sites: How do we code these fields for a tumor that is predominantly a "well differentiated liposarcoma" [8851/31] that has a less predominent type of "dedifferentiated liposarcoma" [8858/33]? If we code the predominant cell type [8851/3] and the worst grade [3], the case will not pass edits because well-differentiated liposarcoma requires a differentiation code of 1. See discussion.
Histology (Pre-2007)--Testis: What code is used to represent the histology of "mixed germ cell tumor, embryonal carcinoma and mature teratoma" of the testis? See discussion.
Histology (Pre-2007)/Diagnostic Confirmation: What code is used to represent the histology that initially presents on uterine curettage as a hydatidiform mole and after pulmonary metastases develop a month later, the clinical diagnosis is "metastatic gestational trophoblastic disease"?
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