ICD-10-CM 2027 diagnosis code
D05.9Unspecified type of carcinoma in situ of breast
D05.9 is a header code, so it can't be reported by itself. Choose one of the 3 more specific codes beneath it.
Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data
About D05.9
D05.9 is the ICD-10-CM diagnosis code for unspecified type of carcinoma in situ of breast. It belongs to category D05 (carcinoma in situ of breast), block D00-D09 (in situ neoplasms) and chapter 2 (neoplasms). It is a header code, so it can't be reported by itself; one of its 3 subcodes must be used instead.
Within D05, choose D05.9 (Unspecified type of carcinoma in situ of breast) only when documentation doesn't support a more specific option: lobular carcinoma in situ of breast (D05.0), Intraductal carcinoma in situ of breast (D05.1) and other specified type of carcinoma in situ of breast (D05.8).
To report this condition, pick the subcode that matches the documentation: D05.90 (breast), D05.91 (breast) and D05.92 (breast).
It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
Specific codes under D05.9
Notes that apply from higher levels
Instructions written at a parent level also apply to D05.9.
Broader instructions also apply from D00-D09 In situ neoplasms and Chapter 2: Neoplasms.
Alphabetic index entries
2 entriesTerms in the official ICD-10-CM index that lead to D05.9.
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about D05.9
Is D05.9 billable?
- No. D05.9 is a header code. Report one of its more specific subcodes instead.