Tumor Tip of the Week 05-19-2023 DCIS, Solid Type

05-19-2023 Use the Solid Tumor Rules, not memory.

Scenario 2023:

· Patient diagnosed Breast Cancer – DCIS, solid type.

Question: How will you code histology?

· 8500/2 Duct/ductal carcinoma in situ

· 8230/2 Ductal carcinoma in situ, solid type

Answer: 8230/2 Ductal carcinoma in situ, solid type Rationale:

· Breast Solid Tumor Rules 2023 Update

o Rule H2 Code the histology when only one histology is present.

§ Note 1: Use Table 3 to code histology. New codes, terms, and synonyms are included in Table 3 and coding errors may occur if the table is not used.

· Table 3: Specific Histologies, NOS/ NST, and Subtypes/Variants Ductal carcinoma in situ, solid type/intraductal carcinoma, solid type 8230/2