Carcinoma in situ of breast (D05) ICD-10-CM
The D05 code range covers carcinoma in situ of breast with 17 ICD-10-CM diagnosis codes. 12 of them are billable and valid for claim submission in fiscal year 2027, and the category headers group them but cannot themselves be billed.
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
Codes in the D05 Range 17 codes · 12 billable
- D05 Carcinoma in situ of breastNon-billable
- D05.0 Lobular carcinoma in situ of breastNon-billable
- D05.00 Lobular carcinoma in situ of unspecified breast
- D05.01 Lobular carcinoma in situ of right breast
- D05.02 Lobular carcinoma in situ of left breast
- D05.1 Intraductal carcinoma in situ of breastNon-billable
- D05.10 Intraductal carcinoma in situ of unspecified breast
- D05.11 Intraductal carcinoma in situ of right breast
- D05.12 Intraductal carcinoma in situ of left breast
- D05.8 Other specified type of carcinoma in situ of breastNon-billable
- D05.80 Other specified type of carcinoma in situ of unspecified breast
- D05.81 Other specified type of carcinoma in situ of right breast
- D05.82 Other specified type of carcinoma in situ of left breast
- D05.9 Unspecified type of carcinoma in situ of breastNon-billable
- D05.90 Unspecified type of carcinoma in situ of unspecified breast
- D05.91 Unspecified type of carcinoma in situ of right breast
- D05.92 Unspecified type of carcinoma in situ of left breast
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the D05 range.
Breast Carcinoma In Situ
An intraepithelial carcinoma that arises from the breast without evidence of invasion. It includes ductal carcinoma in situ and lobular carcinoma in situ.
Breast Ductal Carcinoma In Situ|Ductal Breast Carcinoma In Situ
A breast carcinoma entirely confined to the mammary ducts. It is also known as DCIS. There is no evidence of invasion of the basement membrane. Currently, it is classified into three categories: High-grade DCIS, intermediate-grade DCIS and low-grade DCIS. In this classification the DCIS grade is defined by a combination of nuclear grade, architectural growth pattern and presence of necrosis. The size of the lesion as well as the grade and the clearance margins play a major role in dictating the most appropriate therapy for DCIS.
Breast Lobular Carcinoma In Situ|Lobular Breast Carcinoma In Situ
A non-invasive adenocarcinoma of the breast characterized by a proliferation of monomorphic cells completely filling the lumina. The overall lobular architecture is preserved. It is frequently multifocal (90% in some series) and bilateral. It seldom becomes invasive; however there is an increased risk of infiltrating ductal adenocarcinoma.
About the D05 Code Range
Breast carcinoma in situ is cancer arising in the breast without evidence of invasion.
D05 separates these cancers by type: lobular (D05.0), intraductal (D05.1), other specified (D05.8), or unspecified (D05.9). Each type then has codes for the right breast, left breast, or breast with no side specified.
Questions About This Page
How many billable codes are in the D05 range?
Of the 17 codes in this range, 12 are billable and valid for claim submission from October 1, 2026 through September 30, 2027. Category header codes group them but cannot be reported on claims.
What does the D05 range classify?
The range classifies carcinoma in situ of breast. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
