Special Codes in ICD-O for Topography of Lymph Nodes (C77)
and Hematopoietic and Reticuloendothelial Systems (C42)
In ICD-10, the category C77 is used for secondary and unspecified
malignant neoplasms of lymph nodes. In ICD-O, C77 is used
as the topography code for lymph nodes. As a result, most
of the malignant lymphomas (C81-C85) in ICD-10 are coded to
the topography code C77 in ICD-O.
C42 is a vacant category in ICD-10 but is used in ICD-O to
designate several topographic sites within the hematopoietic
and reticuloendothelial
systems. This category serves principally
as the topography site for most of the leukemias and related
conditions classified to C90-C95 in ICD-10. Table 6 lists
the subcategories for C42 in ICD-O.
|
Table 6. ICD-O Topography
Codes Not in ICD-10
|
| C42
|
Hematopoietic
and Reticuloendothelial System |
| C42.0 |
Blood |
| C42.1 |
Bone
Marrow |
| C42.2 |
Spleen |
| C42.3 |
Reticuloendothelial
system, NOS |
| C42.4 |
Hematopoietic
system, NOS |
|
|
For example chronic lymphocytic lymphoma is coded C91.1 in
ICD-10. In ICD-O, it is coded C42.1 (the topography code for
bone marrow), M-9823/3 (the morphology code for chronic lymphocytic
leukemia).
The ICD-10 category for malignant neoplasm of the spleen
(C26.1) does not appear under digestive organs in ICD-O, Third
Edition. Following the practice of ICD-O, First Edition, the
spleen is assigned code C42.2, under the hematopoietic and
reticuloendothelial systems.
Hydatidiform Mole and Neurofibromatosis (Von Recklinghausen
disease except bone)
The final differences between ICD-O and Chapter II of ICD-10
are that hydatidiform
mole, NOS (C58.9 M-9100/0 in ICD-O) is classified
not in Chapter II (Neoplasms) of ICD-10 but in Chapter XV
"Pregnancy, Childbirth and the Puerperium" (Category O01.9,
Hydatidiform mole), and neurofibromatosis
including Von
Recklinghausen disease except bone (M-9540/1
in ICD-O) appears in Chapter XVII "Congenital Malformations,
Deformations and Chromosomal Abnormalities" as Category Q85.0.
HIV Disease and AIDS
There has been great interest in malignant neoplasms associated
with human immunodeficiency virus (HIV) disease. These neoplasms
should be coded following the rules in the ICD-O-3 manual.
The associated condition, acquired immunodeficiency syndrome
(AIDS), could be coded in a separate field of the cancer registry
data file.
Functions of Neoplasms
ICD-O does not generally provide code numbers for the function
of neoplasms, for example catecholamine
production by a malignant pheochromocytoma (C74.1, M-8700/3).
Separate codes, such as those in Chapter IV "Endocrine, Nutritional
and Metabolic Diseases" of ICD-10, can be used to record some
of the functions of neoplasm. Catecholamine production in
the example above would be coded to E27.5.
|
