C77.9 Secondary and unspecified malignant neoplasm of lymph node, unspecified

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

Applies from C77 Secondary and unspecified malignant neoplasm of lymph nodes

Excludes1 (never code together)

• malignant neoplasm of lymph nodes, specified as primary (C81-C86, C88, C96.-)
• mesentery metastasis of carcinoid tumor (C7B.04)
• secondary carcinoid tumors of distant lymph nodes (C7B.01)

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 10 — Lymphoma and Other Cancers
• RxHCC V08: HCC 20 — Lung, Kidney, and Other Cancers; Secondary Cancer of Lymph Nodes and Other Sites
• ESRD V24: HCC 10

MS-DRG index

Defines the logic of DRG(s) 820-822 in MDC 17.

Approximate ICD-9-CM (GEMs)

• 196.9 Secondary and unspecified malignant neoplasm of lymph nodes, site unspecified

Nearby codes

• C77.2 Secondary and unspecified malignant neoplasm of intra-abdominal lymph nodes
• C77.3 Secondary and unspecified malignant neoplasm of axilla and upper limb lymph nodes
• C77.4 Secondary and unspecified malignant neoplasm of inguinal and lower limb lymph nodes
• C77.5 Secondary and unspecified malignant neoplasm of intrapelvic lymph nodes
• C77.8 Secondary and unspecified malignant neoplasm of lymph nodes of multiple regions
• C77.9 Secondary and unspecified malignant neoplasm of lymph node, unspecified (this code)