Home » Archived Modules » Multiple Primaries & Histology Coding Rules » Putting it All Together » Hands-on Exercises » Exercise #12
- Multiple Primaries & Histology Coding Rules
- Overview: What The 2007 Rules Are
- Why New Rules Are Necessary
- Major Changes
- Formats
- When & How to Use the New Rules
- Putting it All Together
Multiple Primaries & Histology Coding Exercise: Exercise 12
Excision "right breast mass": Ductal carcinoma in situ, cribriform, micropapillary, solid, and comedo type.
Number of Primaries: One
Rule M3
A single tumor is always a single primary.
Histology for Primary #1: 8501
Rule H4 (single tumor all in situ)
Code 8501 when there is non-infiltrating comeocarcinoma and any other intraductal carcinoma in Table 1.
Note: Code behavior as in situ, /2.
Histology for Primary #2: Not applicable.



