C50.919 Malignant neoplasm of unspecified site of unspecified female breast

The ICD-10-CM code for Malignant neoplasm of unspecified site of unspecified female breast is C50.919 (FY2026). It is a billable, claim-ready diagnosis code.

Choosing between codes? See the guide: ICD-10 code for breast cancer.

Classification

Chapter

2: Neoplasms (C00-D49)

Section

C50: Malignant neoplasms of breast (C50)

Category C50

86 codes (57 billable)

FY2026 Status

Stable since FY2024

U.S. Hospital Utilization

• An estimated 62,845 U.S. inpatient stays in 2023 included C50.919 among the documented diagnoses.
• 2,545 stays listed it as the principal diagnosis.

Source: National Inpatient Sample (NIS), Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality, 2016–2023. National survey-weighted estimates.

Prevalence & Statistics

• An estimated 321,910 new cases of female breast cancer will be diagnosed in the United States in 2026, and an estimated 42,140 people will die of the disease. (NCI SEER Cancer Stat Facts: Female Breast Cancer, 2026)

Official Coding Guidelines

Tx of primary site (TOC entry)

a. Admission/Encounter for treatment of primary site ............................................................. 33

Tx of secondary site (TOC entry)

b. Admission/Encounter for treatment of secondary site .......................................................... 33

Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026

References

• CMS — ICD-10-CM Official Code Set and Guidelines, FY2026
• CDC/NCHS — ICD-10-CM Files and Browser Tool
• AHRQ — HCUP National Inpatient Sample, Frequencies by Diagnosis Code (2016–2023)
• NCI SEER Cancer Stat Facts: Female Breast Cancer (2026)

Cite This Page

Reference C50.919 with the canonical source and edition:

C50.919 — Malignant neoplasm of unspecified site of unspecified female breast. ICD-10 Coding Pro (ICD-10-CM FY2026). https://icd10codingpro.com/codes/C50.919

Canonical URL: https://icd10codingpro.com/codes/C50.919