2026 ICD-10-CM Diagnosis Code C50.A0
Malignant inflammatory neoplasm of unspecified breast
- ICD-10-CM Code:
- C50.A0
- ICD-10 Code for:
- Malignant inflammatory neoplasm of unspecified breast
- Is Billable?
- Yes - Valid for Submission
- Code Navigator:
C50.A0 is a billable diagnosis code used to specify a medical diagnosis of malignant inflammatory neoplasm of unspecified breast. The code is valid during the current fiscal year for the submission of HIPAA-covered transactions from October 01, 2025 through September 30, 2026.
The following anatomical sites found in the Table of Neoplasms reference the parent code C50.A of the current diagnosis code given the correct histological behavior: Neoplasm, neoplastic breast (connective tissue) (glandular tissue) (soft parts) inflammatory .
Unspecified diagnosis codes like C50.A0 are acceptable when clinical information is unknown or not available about a particular condition. Although a more specific code is preferable, unspecified codes should be used when such codes most accurately reflect what is known about a patient's condition. Specific diagnosis codes should not be used if not supported by the patient's medical record.
New 2026 ICD-10-CM Code
C50.A0 is new to ICD-10-CM code set for the FY 2026, effective October 1, 2025. The National Center for Health Statistics (NCHS) has published an update to the ICD-10-CM diagnosis codes which became effective October 1, 2025. This is a new and revised code for the FY 2026 (October 1, 2025 - September 30, 2026).
Replacement Code
C50A0 replaces the following previously assigned ICD-10-CM code(s):
- C50.919 - Malignant neoplasm of unsp site of unspecified female breast
- C50.929 - Malignant neoplasm of unsp site of unspecified male breast
Table of Neoplasms
The parent code C50.A of the current diagnosis code is referenced in the table of neoplasms by anatomical site. For each site there are six possible code numbers according to whether the neoplasm in question is malignant, benign, in situ, of uncertain behavior, or of unspecified nature. The description of the neoplasm will often indicate which of the six columns is appropriate.
Where such descriptors are not present, the remainder of the Index should be consulted where guidance is given to the appropriate column for each morphological (histological) variety listed. However, the guidance in the Index can be overridden if one of the descriptors mentioned above is present.
| Neoplasm, neoplastic | Malignant Primary |
Malignant Secondary |
CaInSitu | Benign | Uncertain Behavior |
Unspecified Behavior |
|---|---|---|---|---|---|---|
| »Neoplasm, neoplastic »breast (connective tissue) (glandular tissue) (soft parts) »inflammatory | C50.A |
Code History
- FY 2026 - Code Added, effective from 10/1/2025 through 9/30/2026
