C80.0 Disseminated malignant neoplasm, unspecified

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

Applicable to

• Carcinomatosis NOS
• Generalized cancer, unspecified site (primary) (secondary)
• Generalized malignancy, unspecified site (primary) (secondary)

Applies from C80 Malignant neoplasm without specification of site

Excludes1 (never code together)

• malignant carcinoid tumor of unspecified site (C7A.00)
• malignant neoplasm of specified multiple sites- code to each site

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 20 — Lung, Kidney, and Other Cancers; Secondary Cancer of Lymph Nodes and Other Sites
• ESRD V24: HCC 8

MS-DRG index

Defines the logic of DRG(s) 826-828 in MDC 17.

Approximate ICD-9-CM (GEMs)

• 199.0 Disseminated malignant neoplasm without specification of site

Code annotations containing back-references to C80.0

Back-references to C80.0

• Type 1 Excludes: C79.9 Secondary malignant neoplasm of unspecified site ("carcinomatosis NOS (C80.0)")
• Type 1 Excludes: C79.9 Secondary malignant neoplasm of unspecified site ("generalized cancer NOS (C80.0)")

Diagnosis Index entries for C80.0

• Carcinoma (malignant) › generalized, with unspecified primary site
• Carcinomatosis
• Carcinomatosis › unspecified site (primary) (secondary)

Nearby codes

• C80 Malignant neoplasm without specification of site
• C80.0 Disseminated malignant neoplasm, unspecified (this code)
• C80.1 Malignant (primary) neoplasm, unspecified
• C80.2 Malignant neoplasm associated with transplanted organ