ICD-10-CM diagnosis code
C50.511 Malignant neoplasm of lower-outer quadrant of right female breast
- Billable
- Yes, a complete code (FY2026)
- Category
- C50 Malignant neoplasm of breast
- Chapter
- 2. Neoplasms
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Other codes in C50
57 complete codes in this category.
- C50.411Malignant neoplasm of upper-outer quadrant of right female breast
- C50.412Malignant neoplasm of upper-outer quadrant of left female breast
- C50.419Malignant neoplasm of upper-outer quadrant of unspecified female breast
- C50.421Malignant neoplasm of upper-outer quadrant of right male breast
- C50.422Malignant neoplasm of upper-outer quadrant of left male breast
- C50.429Malignant neoplasm of upper-outer quadrant of unspecified male breast
- C50.511Malignant neoplasm of lower-outer quadrant of right female breast
- C50.512Malignant neoplasm of lower-outer quadrant of left female breast
- C50.519Malignant neoplasm of lower-outer quadrant of unspecified female breast
- C50.521Malignant neoplasm of lower-outer quadrant of right male breast
- C50.522Malignant neoplasm of lower-outer quadrant of left male breast
- C50.529Malignant neoplasm of lower-outer quadrant of unspecified male breast
Documentation tips
- Make sure the note supports every element of the title, “Malignant neoplasm of lower-outer quadrant of right female breast”: each detail in it should be traceable to the history, examination or assessment.
- Code to the highest specificity the documentation supports. If a detail is missing from the note, add it to the note rather than choosing a less specific code by default.
- Check the Tabular List and official guidelines for instructional notes (“code first”, “use additional code”, Excludes1/Excludes2) that apply to C50.
The international WHO ICD-10 also has C50, with its inclusion and exclusion notes; titles and detail can differ from ICD-10-CM.
ICD-10-CM is developed by the National Center for Health Statistics (NCHS), Centers for Disease Control and Prevention, U.S. Department of Health and Human Services, and is based on the WHO ICD-10. Codes and titles are reproduced unchanged from the FY2026 code list (effective 1 October 2025). Their use here does not imply endorsement by CDC, HHS or the U.S. Government. Changes effective on or after 1 October 2026 may not be reflected yet; check the current release at cdc.gov or cms.gov before submitting claims.
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