D05.1 Intraductal carcinoma in situ of breast

The ICD-10-CM code for Intraductal carcinoma in situ of breast is D05.1 (FY2026). It is a non-billable category code — select a more specific code below for claims.

Classification

Chapter

2: Neoplasms (C00-D49)

Section

D00-D09: In situ neoplasms (D00-D09)

Category D05

17 codes (12 billable)

FY2026 Status

Stable since FY2024

Also Known As

ICD-10-CM Alphabetic Index entries that lead to D05.1:

• Carcinoma-in-situ › intraductal › unspecified site
• Carcinoma (malignant) › intraductal (noninfiltrating) › breast
• Adenocarcinoma › intraductal › unspecified site
• Carcinoma (malignant) › intraductal (noninfiltrating) › unspecified site (female)
• Adenocarcinoma › intraductal › breast
• Carcinoma-in-situ › intraductal › breast
• Adenocarcinoma › intraductal › noninfiltrating › breast
• Adenocarcinoma › intraductal › noninfiltrating › unspecified site

Official Coding Guidelines

Tx of primary site (TOC entry)

a. Admission/Encounter for treatment of primary site ............................................................. 33

Tx of secondary site (TOC entry)

b. Admission/Encounter for treatment of secondary site .......................................................... 33

Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026

References

• CMS — ICD-10-CM Official Code Set and Guidelines, FY2026
• CDC/NCHS — ICD-10-CM Files and Browser Tool