8 M1 When it is not possible to determine if there is a single melanoma or multiple melanomas, opt for a single melanoma and abstract as a single primary. Note: Use this rule only after all information sources have been exhausted.
12 M3 Melanomas in sites with ICD-O-3 topography codes that are different at the second (Cxxx), third (Cxxx) or fourth (C44x) character are multiple primaries.
13 M4 Melanomas with different laterality are multiple primaries. Note: A midline melanoma is a different laterality than right or left.
14 M4 Examples Example 1: Melanoma of the right side of the chest and a melanoma at midline of the chest are different laterality, multiple primaries.
15 M4 Examples Example 2: A melanoma of the right side of the chest and a melanoma of the left side of the chest are multiple primaries.
16 M5 Melanomas with ICD-O-3 histology codes that are different at the first (xxxx), second (xxxx) or third number (xxxx) are multiple primaries.
17 M6 An invasive melanoma that occurs more than 60 days after an in situ melanoma is a multiple primary.
18 M6 Notes Note 1: The purpose of this rule is to ensure that the case is counted as an incident (invasive) case when incidence data are analyzed.
19 M6 Notes Note 2: Abstract as multiple primaries even if the medical record/physician states it is recurrence or progression of disease.
20 M7 Melanomas diagnosed more than 60 days apart are multiple primaries.
21 M8 Melanomas that do not meet any of the above criteria are abstracted as a single primary.
22 M8 Notes Note 1: Use the data item Multiplicity Counter to record the number of melanomas abstracted as a single primary.
23 M8 Notes Note 2: When an invasive melanoma follows an in situ melanoma within 60 days, abstract as a single primary. Note 3: All cases covered by this rule are the same site and histology.
24 M8 Examples This is NOT intended to be an exhaustive set of examples; there are other cases that may be classified as a single primary. Warning: Using only these case examples to determine the number of primaries can result in major errors.
25 M8 Examples Example 1: Solitary melanoma on the left back and another solitary melanoma on the left chest Example 2: Solitary melanoma on the right thigh and another solitary melanoma on the right ankle
27 Single Melanoma or Multiple Melanomas Abstracted as a Single Primary
28 H1 Code the histology documented by the physician when there is no pathology/cytology specimen or the pathology/cytology report is not available.
29 H1 Notes Note 1: Priority for using documents to code the histology Documentation in the medical record that refers to pathologic or cytologic findings Physicians reference to type of melanoma in the medical record PET scan
30 H1 Notes Note 2: Code the specific histology when documented.
31 H2 Code the histology from the metastatic site when there is no pathology/cytology specimen from the primary site. Note: Code the behavior /3
32 H3 Code the histology when only one histologic type is identified.
33 H4 Code the invasive histologic type when there are invasive and in situ components.
34 H5 Code the histologic type when the diagnosis is regressing melanoma and a histologic type. Example: Nodular melanoma with features of regression. Code 8721 (Nodular melanoma).
35 H6 Code 8723 (Malignant melanoma, regressing) when the diagnosis is regressing melanoma. Example: Malignant melanoma with features of regression. Code 8723.
36 H7 Code the histologic type when the diagnosis is lentigo maligna melanoma and a histologic type.
37 H8 Code 8742 (Lentigo maligna melanoma) when the diagnosis is lentigo maligna melanoma
38 H9 Code the most specific histologic term when the diagnosis is melanoma, NOS (8720) with a single specifc type.
39 H9 Notes Note 1: The specific type for in situ lesions may be identified as pattern, architecture, type, subtype, predominantly, with features of, major, or with ____differentiation
40 H9 Notes Note 2: The specific type for invasive lesions may be identified as type, subtype, predominantly, with features of, major, or with ____differentiation
41 H10 Code the histology with the numerically higher ICD-O-3 code.