2026 ICD-10-CM Diagnosis Code C50.929Malignant neoplasm of unspecified site of unspecified male breast
ICD-10-CM Codes›C00–D49›C50›C50
- Billable — Valid for Submission
- Chronic Condition
C50.929 is a billable ICD-10-CM diagnosis code for malignant neoplasm of unspecified site of unspecified male breast. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 582 through 583, 597 through 599. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Breast cancer - all other types.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Adenocarcinoma of breast
- Blood/lymphatic vessel invasion by tumor absent
- Blood/lymphatic vessel invasion by tumor indeterminate
- Blood/lymphatic vessel invasion by tumor present
- Carcinoma of bone, connective tissue, skin and breast
- Carcinoma of breast
- Carcinoma of salivary gland type of breast
- Eccrine ductal carcinoma
- Familial cancer of breast
- Germline BRCA-mutated, HER2-negative metastatic breast cancer
- HER2-positive carcinoma of breast
- Hidradenocarcinoma
- Hormone receptor negative neoplasm
- Hormone receptor positive malignant neoplasm of breast
- Hormone receptor positive tumor
- Human epidermal growth factor 2 negative carcinoma of breast
- Infiltrating ductal carcinoma of breast, stage 1
- Infiltrating ductal carcinoma of breast, stage 2
- Infiltrating ductal carcinoma of breast, stage 3
- Infiltrating ductal carcinoma of breast, stage 4
- Infiltrating lobular carcinoma of breast
- Inflammatory carcinoma of breast
- Invasive carcinoma of breast
- Local recurrence of malignant neoplasm of breast
- Locally advanced breast cancer
- Malignant melanoma of breast
- Malignant neoplasm in full remission
- Malignant neoplasm in partial remission
- Malignant neoplasm of bone, connective tissue, skin and breast
- Malignant neoplasm of breast
- Malignant neoplasm of breast in full remission
- Malignant neoplasm of breast in partial remission
- Malignant neoplasm of breast in remission
- Malignant neoplasm of ectopic site of breast
- Malignant phyllodes tumor of breast
- Metaplastic carcinoma of breast
- Metastatic carcinoma to breast
- Metastatic human epidermal growth factor 2 positive carcinoma of breast
- Metastatic lobular carcinoma
- Mixed ductal and lobular carcinoma of breast
- Mucinous carcinoma of breast
- Neoplasm of ectopic site of breast
- Phyllodes tumor of breast
- Primary angiosarcoma of breast
- Primary angiosarcoma of thorax
- Primary angiosarcoma of trunk
- Primary carcinoma of breast
- Primary infiltrating duct carcinoma of breast
- Primary infiltrating lobular carcinoma of breast
- Primary inflammatory carcinoma of breast
- Primary intracystic papillary carcinoma of breast
- Primary invasive pleomorphic lobular carcinoma of breast
- Primary malignant neoplasm of breast
- Primary malignant neoplasm of ectopic site of breast
- Primary malignant phyllodes tumor of breast
- Primary metaplastic carcinoma of breast
- Primary mixed ductal and lobular carcinoma of breast
- Primary mucinous carcinoma of breast
- Primary scirrhous carcinoma of breast
- Primary solid papillary carcinoma with invasion of breast
- Recurrent primary malignant neoplasm of breast
- Sarcoma of breast
- Scirrhous carcinoma of breast
- Triple-negative breast cancer
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Male Breast Cancer
Although breast cancer is much more common in women, men can get it too. It happens most often to men between the ages of 60 and 70.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert C50.929 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code History & ChangesHistory
Replaced This code was replaced in the FY 2026 code set by:
- C50.A0 - Malignant inflammatory neoplasm of unspecified breast
- C50.A0 - Malignant inflammatory neoplasm of unspecified breast
- C50.A0 - Malignant inflammatory neoplasm of unspecified breast
- C50.A0 - Malignant inflammatory neoplasm of unspecified breast
- C50.A0 - Malignant inflammatory neoplasm of unspecified breast
- C50.A0 - Malignant inflammatory neoplasm of unspecified breast
Questions About C50.929Overview
Is C50.929 (Malignant neoplasm of breast of unspecified site, male) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report malignant neoplasm of unspecified site of unspecified male breast on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does C50.929 group to?
When malignant neoplasm of unspecified site of unspecified male breast is the principal diagnosis on an inpatient stay, it groups to MS-DRG 582, 583, 597, 598, 599, with relative weights from 0.7332 to 1.9266 depending on complications. Higher weights mean higher Medicare reimbursement.
What is the ICD-9 equivalent of C50.929?
Under the General Equivalence Mappings, malignant neoplasm of unspecified site of unspecified male breast converts to ICD-9-CM 175.9 (mal neo male breast NEC). The mapping is approximate, so confirm the match fits the documentation.
Footnotes
[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:
- The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
- The condition places limitations on self-care, independent living, and social interactions.
