Reportability: Is positive urine cytology (ex: malignant cells interpreted as carcinoma) by itself reportable? If so, is the case coded to bladder by default or is is coded to C689, urinary system, NOS?
Multiple primaries/Histology--Heme & Lymphoid Neoplasms: How many primaries are accessioned and what histology codes are used for a 2005 diagnosis of nodular histiocytic lymphoma followed by a 2012 diagnosis of B-cell chronic lymphocytic leukemia/small lymphocytic lymphoma? See Discussion.
Primary site--Heme & Lymphoid Neoplasms: How is the primary site coded for chronic lymphocytic leukemia/small lymphocytic lymphoma when a lymph node biopsy was positive for CLL/SLL but no bone marrow biopsy was performed? See Discussion.
Multiple primaries--Heme & Lymphoid Neoplasms: How many primaries are accessioned if a patient is diagnosed in 2004 with extranodal diffuse large B-cell lymphoma (DLBCL) of the stomach followed by a 2011 diagnosis of DLBCL involving abdominal lymph nodes? See Discussion.
Primary site--Heme & Lymphoid Neoplasms: How is the primary site coded for a diagnosis of multifocal Langerhans cell histiocytosis with involvement of the bone, liver, spleen and retroperitoneum?
Primary site--Heme & Lymphoid Neoplasms: How is the primary site coded and what rule applies if the patient has involvement of multiple organs and one lymph node chain with diffuse large B-cell lymphoma? See Discussion.
Multiple primaries--Heme & Lymphoid Neoplasms: How many primaries are accessioned when a bone marrow biopsy shows myelodysplastic syndrome - refractory anemia with excess blasts type 2 (RAEB-2) and myelofibrosis? See Discussion.
Histology--Heme & Lymphoid Neoplasms: What is the correct histology code for a diagnosis of mature B cell leukemia/lymphoma diagnosed only on a peripheral blood smear?
MP/H Rules/Histology--Thyroid: How is the histology coded for a poorly differentiated thyroid carcinoma with rhabdoid phenotype arising in a papillary carcinoma?
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