C79.51 Secondary malignant neoplasm of bone

Billable ICD-10-CM code, FY2026. Acts as a Complication or Comorbidity (CC) as a secondary diagnosis.

Applies from C79 Secondary malignant neoplasm of other and unspecified sites

Excludes1 (never code together)

• secondary carcinoid tumors (C7B.-)
• secondary neuroendocrine tumors (C7B.-)

Applies from C79.5 Secondary malignant neoplasm of bone and bone marrow

Excludes1 (never code together)

• secondary carcinoid tumors of bone (C7B.03)

Risk adjustment (HCC)

• CMS-HCC V28: HCC 18 — Cancer Metastatic to Bone, Other and Unspecified Metastatic Cancer; Acute Leukemia Except Myeloid
• CMS-HCC V22: HCC 8 — Metastatic Cancer and Acute Leukemia
• RxHCC V08: HCC 17 — Secondary Cancer of Bone and Kidney
• ESRD V24: HCC 8

MS-DRG index

Defines the logic of DRG(s) 456-458 in MDC 08.

Approximate ICD-9-CM (GEMs)

• 198.5 Secondary malignant neoplasm of bone and bone marrow (approximate)

Nearby codes

• C79.32 Secondary malignant neoplasm of cerebral meninges
• C79.4 Secondary malignant neoplasm of other and unspecified parts of nervous system
• C79.40 Secondary malignant neoplasm of unspecified part of nervous system
• C79.49 Secondary malignant neoplasm of other parts of nervous system
• C79.5 Secondary malignant neoplasm of bone and bone marrow
• C79.51 Secondary malignant neoplasm of bone (this code)
• C79.52 Secondary malignant neoplasm of bone marrow
• C79.6 Secondary malignant neoplasm of ovary
• C79.60 Secondary malignant neoplasm of unspecified ovary
• C79.61 Secondary malignant neoplasm of right ovary
• C79.62 Secondary malignant neoplasm of left ovary