ICD-10-CM 2027 diagnosis code
C50.51Malignant neoplasm of lower-outer quadrant of breast, female
C50.51 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 C50.51
C50.51 is the ICD-10-CM diagnosis code for malignant neoplasm of lower-outer quadrant of breast, female. It belongs to category C50 (malignant neoplasm of breast), block C50 (malignant neoplasms of breast) 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 C50.5 (malignant neoplasm of lower-outer quadrant of breast), C50.51 is specifically for malignant neoplasm of lower-outer quadrant of breast, female. Related codes cover male (C50.52).
To report this condition, pick the subcode that matches the documentation: C50.511 (breast), C50.512 (breast) and C50.519 (breast).
Use an additional code to identify estrogen, and other hormones and factors receptor status (Z17.-).
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 C50.51
Notes that apply from higher levels
Instructions written at a parent level also apply to C50.51.
Broader instructions also apply from Chapter 2: Neoplasms.
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 C50.51
Is C50.51 billable?
- No. C50.51 is a header code. Report one of its more specific subcodes instead.