What is the ICD‑10‑CM code for metastatic cancer of the right breast? | Rounds What is the ICD‑10‑CM code for metastatic cancer of the right breast? | Rounds

What is the ICD‑10‑CM code for metastatic cancer of the right breast?

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Last updated: July 14, 2026 · View editorial policy

ICD-10-CM code for metastatic cancer of the right breast

Metastatic right breast cancer is coded using a primary malignant neoplasm of right female breast code (C50.9x) plus an additional secondary malignant neoplasm code for the metastatic site (C77–C79). [1]

Primary site code (right breast)

  • C50.911 — Malignant neoplasm of unspecified site of right female breast (use when the right breast cancer site is not further specified). [1]

Metastatic site code (required for “metastatic”)

  • An additional code from C77–C79 is required to specify the anatomic site of metastasis (e.g., bone, lung, liver). [1]

Sources (1)

[1] Guideline 2026
ICD-10-CM C50.911 - Malignant neoplasm of unspecified site …
Unbound Medicine (ICD-10-CM)
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