ICD-10 Lookup Tool
The ICD-10 Lookup Tool provides instant access to medical diagnosis codes. Get comprehensive code information including billable status, synonyms, clinical details, and coding tips—all stored in our database for lightning-fast results.
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✅ Billable/Specific Code
2025 ICD-10-CM
Effective: Oct 1, 2024
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Important: This tool uses AI to assist with code lookups. While we strive for accuracy, AI can make mistakes. Always verify information with official ICD-10 resources before using in medical billing or clinical documentation.
**2025 ICD-10-CM Diagnosis Code C50.9**
**Malignant neoplasm of unspecified site of unspecified female breast**
**Years:** 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | **2025**
**Billable/Specific Code**
C50.9 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
The 2025 edition of ICD-10-CM C50.9 became effective on October 1, 2021.
This is the American ICD-10-CM version of C50.9 - other international versions of ICD-10 C50.9 may differ.
The following code(s) above C50.9 contain annotation back-references that may be applicable to C50.9:
**Chapter 2 - Neoplasms (C00-D49)**
**C50 - Malignant neoplasm of breast**
**Approximate Synonyms**
Breast carcinoma
Malignant breast tumor
**Clinical Information**
Breast cancer refers to the abnormal growth of cells in the breast tissue, typically forming a tumor.
Symptoms may include a lump in the breast, changes in breast shape or size, nipple discharge, or skin changes.
Early detection through screening mammograms and prompt treatment are crucial for better outcomes.
Treatment options include surgery, chemotherapy, radiation therapy, and hormone therapy.
**ICD-10-CM C50.9 is grouped within Diagnostic Related Group(s) (MS-DRG v42.0):**
DRG 597 - Malignant breast disorders with MCC
DRG 598 - Malignant breast disorders with CC
**Related ICD-10 Codes:**
- [D05.01 - Lobular carcinoma in situ of right female breast](/icd10-lookup/lobular-carcinoma-in-situ-of-right-female-breast)
- [Z85.3 - Personal history of malignant neoplasm of breast](/icd10-lookup/personal-history-of-malignant-neoplasm-of-breast)
**Convert C50.9 to ICD-9-CM**
ICD-9-CM equivalent: 174.9
**Coding Tips:**
• Assign additional codes for specific details like laterality, stage, and histology.
• Review documentation carefully to capture all relevant information for accurate coding.
**Documentation Requirements:**
• Include details on the site, laterality, behavior, and any known metastases.
• Document the stage of the cancer and any treatments provided.
**Common Coding Errors to Avoid:**
• Not documenting the specific site or laterality of the breast cancer.
• Failing to code all relevant diagnoses and complications.
**Reimbursement Considerations:**
• Ensure accurate coding and documentation to support medical necessity for services.
• Review payer guidelines for specific documentation and coding requirements.
**Code History**
2022 (effective 10/1/2021): No change
2021 (effective 10/1/2020): New code
**Code annotations containing back-references to C50.9:**
Code First: underlying disease, if applicable
Excludes1: benign neoplasm of breast (D24.-)
Excludes2: carcinoma in situ of breast (D05.-)
**Diagnosis Index entries containing back-references to C50.9:**
Breast cancer, female (unspecified site) - C50.9
Neoplasm, neoplastic - breast (female) - C50.9
Tumor - see also Neoplasm, by site, malignant - C50.9
**Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.**