2026 ICD-10-CM Diagnosis Code C50Malignant neoplasm of breast

ICD-10-CM Codes›C00–D49›C50›C50

ICD-10-CM C50
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

C50 is a non-billable ICD-10-CM category code for malignant neoplasm of breast, so it cannot be submitted on claims. Use a more specific code from this category instead, such as C50.011, C50.012, C50.019, and C50.021.

Code Identity

ICD-10-CM Code
C50
Billable Status
No — Non-Billable Category
Code Describes
Malignant neoplasm of breast
Chapter
C50
Malignant neoplasms of breast

Code Classification

ChapterC00–D49Neoplasms
SectionC50Malignant neoplasms of breast
CategoryC50Malignant neoplasm of breast
This CodeC50Malignant neoplasm of breast

Specific Coding for Malignant neoplasm of breastOverview

Non-specific codes like C50 require more characters. Use one of these billable codes instead:

  • C50.0 for Malignant neoplasm of nipple and areola

  • C50.01 for Malignant neoplasm of nipple and areola, female

  • C50.02 for Malignant neoplasm of nipple and areola, male

  • C50.1 for Malignant neoplasm of central portion of breast

  • C50.11 for Malignant neoplasm of central portion of breast, female

  • C50.12 for Malignant neoplasm of central portion of breast, male

  • C50.2 for Malignant neoplasm of upper-inner quadrant of breast

  • C50.21 for Malignant neoplasm of upper-inner quadrant of breast, female

  • C50.22 for Malignant neoplasm of upper-inner quadrant of breast, male

  • C50.3 for Malignant neoplasm of lower-inner quadrant of breast

  • C50.31 for Malignant neoplasm of lower-inner quadrant of breast, female

  • C50.32 for Malignant neoplasm of lower-inner quadrant of breast, male

  • C50.4 for Malignant neoplasm of upper-outer quadrant of breast

  • C50.41 for Malignant neoplasm of upper-outer quadrant of breast, female

  • C50.42 for Malignant neoplasm of upper-outer quadrant of breast, male

  • C50.5 for Malignant neoplasm of lower-outer quadrant of breast

  • C50.51 for Malignant neoplasm of lower-outer quadrant of breast, female

  • C50.52 for Malignant neoplasm of lower-outer quadrant of breast, male

  • C50.6 for Malignant neoplasm of axillary tail of breast

  • C50.61 for Malignant neoplasm of axillary tail of breast, female

  • C50.62 for Malignant neoplasm of axillary tail of breast, male

  • C50.8 for Malignant neoplasm of overlapping sites of breast

  • C50.81 for Malignant neoplasm of overlapping sites of breast, female

  • C50.82 for Malignant neoplasm of overlapping sites of breast, male

  • C50.9 for Malignant neoplasm of breast of unspecified site

  • C50.91 for Malignant neoplasm of breast of unspecified site, female

  • C50.92 for Malignant neoplasm of breast of unspecified site, male

  • C50.A for Malignant inflammatory neoplasm of breast

  • Use C50.A0 for Malignant inflammatory neoplasm of unspecified breast

  • Use C50.A1 for Malignant inflammatory neoplasm of right breast

  • Use C50.A2 for Malignant inflammatory neoplasm of left breast

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Includes

  • connective tissue of breast
  • Paget's disease of breast
  • Paget's disease of nipple

Use Additional Code

  • code to identify estrogen, and other hormones and factors receptor status Z17

Type 1 Excludes

Patient EducationClinical

Breast Cancer

Breast cancer is a cancer that starts in breast tissue. It happens when cells in the breast change and grow out of control. New cells grow even when you don't need them, and old cells don't die when they should. These extra cells can form a mass called a tumor.

The full article covers:

  • What is breast cancer?
  • What are the types of breast cancer?
  • What causes breast cancer?
  • Who is at risk for breast cancer?
  • What are the signs and symptoms of breast cancer?
  • How is breast cancer diagnosed?
  • What are the treatments for breast cancer?
  • Can breast cancer be prevented?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About C50Overview

Is C50 (Malignant neoplasm of breast) a billable code?

No. This is a category header that groups the codes for malignant neoplasm of breast, and headers cannot be submitted on claims. Claims for malignant neoplasm of breast need a more specific code from this category, such as C50.011, C50.012, and C50.019.