C50.51Header code — not billable
Malignant neoplasm of lower-outer quadrant of breast, female
- Chapter
- 2. Neoplasms
- Category
- C50
- Effective date
- October 1, 2026
Related codes in category C50
C50Malignant neoplasm of breastC50.0Malignant neoplasm of nipple and areolaC50.01Malignant neoplasm of nipple and areola, femaleC50.011Malignant neoplasm of nipple and areola, right female breastYesC50.012Malignant neoplasm of nipple and areola, left female breastYesC50.019Malignant neoplasm of nipple and areola, unsp female breastYesC50.02Malignant neoplasm of nipple and areola, maleC50.021Malignant neoplasm of nipple and areola, right male breastYesC50.022Malignant neoplasm of nipple and areola, left male breastYesC50.029Malignant neoplasm of nipple and areola, unsp male breastYesC50.1Malignant neoplasm of central portion of breastC50.11Malignant neoplasm of central portion of breast, female
Frequently asked questions
What is ICD-10 code C50.51?
C50.51 is an ICD-10-CM diagnosis code for Malignant neoplasm of lower-outer quadrant of breast, female.
Is C50.51 a billable code?
No. C50.51 is a category/header code, not billable on its own — use one of its more specific child codes instead.
What ICD-10-CM chapter is C50.51 in?
C50.51 falls under Chapter 2: Neoplasms.
When did C50.51 become effective?
C50.51 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.
What other codes are related to C50.51?
C50.51 belongs to category C50, which includes 12 other codes — see the related codes list on this page.
ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.