FROM THE CANSWER FORUM:
NAACCR WEBINAR 2016-2017 SERIES: Collecting Cancer Data: Melanoma Part 1 – MP/H Rules
Multiple Primary & Histology Rules
- M3: Topography codes different at second (Cxx.x), third
- (Cxx.x) or Fourth character (Cxx.x) are multiple primaries
- EX: Patient has invasive melanoma on right leg (C44.7) and an invasive melanoma on right arm (C44.6)
- M4: Different laterality are multiple primaries
- EX: Patient has invasive melanoma on right trunk (C44.5) and an invasive melanoma on midline trunk (C44.5)
- Webinar Q&A: Q: Will you be discussing later about laterality for C44.4 & MPH rules? A: Yes. C444, C448 and C449 are not paired sites. Rule M4 for melanoma only applies to paired sites.
- M5: Histology codes different at first (xxxx), second (xxxx) or third number(xxxx) are multiple primaries
- EX: Patient has invasive melanoma (8720/3)on right leg (C44.7) and another invasive superficial spreading melanoma (8743/3) on right leg (C44.7)
- H5: Code histologic type when diagnosis is regressing melanoma and a histologic type
- Webinar Q&A: Q: Will you please give an example of rule H5?
- A: Nodular melanoma with features of regression would be coded to Nodular melanoma Code 8721. This is the example used in the MPH rules pg. 297.
- H6: Code 8723 (malignant melanoma, regressing) when diagnosis is regressing melanoma
- Webinar Q&A: Q: Melanoma with features of regression — is this 8723?
- A: Yes. The example they use in the MPH for rule H6 is this exact example. (MPH pg. 297)
- H7: Code histologic type when diagnosis is lentigo maligna melanoma and a histologic type
- Webinar Q&A: Q: Also will you give an example of rule H7?
- A: nodular lentigo maligna melanoma, you would code to nodular melanoma (8721).
- H8: Code 8742 (lentigo maligna melanoma) when the diagnosis is lentigo maligna melanoma
- H9: Code most specific histology term: melanoma, NOS with a single specific type
- In situ lesions: Pattern, architecture, type, subtype, predominantly, with features of , major or with ___ differentiation
- Invasive lesions: Type, subtype, predominantly, with features of , major or with ___ differentiation