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 2026, 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.
- carcinoma in situ of skin of breast D04.5
- melanoma in situ of breast skin D03.5
- Paget's disease of breast or nipple C50
Type 2 Excludes
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
- malignant neoplasm of breast C50
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
About the D05 Code Range
The ICD-10 code section D05 is used to classify carcinoma in situ of the breast, a non-invasive form of breast cancer confined within the milk ducts or lobules. These codes cover different types including lobular, intraductal, other specified, and unspecified forms, with further subdivision by the affected breast side.
Carcinoma in situ of breast (ICD-10 code D05) distinguishes early breast cancers that have not spread beyond their original tissue. For example, D05.0 refers to lobular carcinoma in situ, which may be identified by terms like "Pleomorphic lobular carcinoma in situ of breast," with codes specifying whether it affects the right (D05.01), left (D05.02), or unspecified breast (D05.00). Similarly, intraductal carcinoma in situ—also called ductal carcinoma in situ (DCIS)—is coded under D05.1, with subcodes for localization (D05.11 right breast, D05.12 left breast, D05.10 unspecified). Other specified types (D05.8) and unspecified types (D05.9) accommodate less common or unclear forms. These distinctions help healthcare providers and medical coders accurately document the condition’s subtype and location using the ICD-10 code for carcinoma in situ of breast, facilitating precise diagnosis and treatment planning.
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, 2025 through September 30, 2026. 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 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
