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2025 ICD-10-CM code C50.9

Malignant neoplasm of the breast, unspecified site. This code is used when the specific location of the breast cancer is not documented.

If the specific site of the breast cancer is known, a more specific code from the C50 category should be used. C50.9 is for cases where the site is truly unspecified in the documentation.

Medical necessity for treatment related to C50.9 is established by the diagnosis of breast cancer itself. The specific treatment plan and its medical necessity will be further defined by staging, receptor status, and other clinical factors.

Clinicians diagnose breast cancer based on physical exams, imaging (mammogram, ultrasound, MRI), and biopsy. Treatment involves surgery (lumpectomy, mastectomy), chemotherapy, radiation, hormone therapy, and targeted therapies, depending on the stage and receptor status.

IMPORTANT:Use additional code to identify estrogen receptor status (Z17.0, Z17.1)

In simple words: This code indicates breast cancer where the exact location in the breast isn't specified in the medical records.

Malignant neoplasm of breast, unspecified site. This encompasses cases where the documentation does not specify the quadrant or other specific location within the breast.

Example 1: A 55-year-old female presents with a palpable lump in her breast. Imaging and biopsy confirm malignancy, but the report does not specify the location within the breast. C50.9 is used., A 48-year-old female undergoes a mastectomy for breast cancer. The pathology report mentions invasive ductal carcinoma, but doesn't detail the specific site within the breast. C50.9 is applied., A 60-year-old male is diagnosed with breast cancer. The documentation confirms malignancy but lacks details about the tumor's location within the breast tissue. C50.9 is appropriate.

Documentation should include details about the diagnosis of malignancy, laterality (right or left breast), and any available information regarding the size, type, and grade of the tumor. Even if the specific site isn't known, any available details about the tumor's characteristics are important.

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