C77.9 vs D48.7

C77.9 (Secondary and unspecified malignant neoplasm of lymph node, unspecified) compared with D48.7 (Neoplasm of uncertain behavior of other specified sites), from the official CMS tabular data. C77.9 and D48.7 name the same anatomical site (lymph) with a different neoplasm behavior. MedCoder-derived

Relationship

Informational

Neoplasm table relationship

C77.9

Secondary and unspecified malignant neoplasm of lymph node, unspecified

↔

D48.7

Neoplasm of uncertain behavior of other specified sites

Same anatomical site, different neoplasm behavior.

Same site — uncertain behavior (lymph)

The behavior documented for the site — malignant primary, secondary, carcinoma in situ, benign, uncertain or unspecified — decides which column of the neoplasm table, and therefore which code, applies.

Source: CMS Table of Neoplasms

Can these codes be reported together?

Same site, different neoplasm behavior. C77.9 and D48.7 name the same anatomical site (lymph) with a different neoplasm behavior.

From the CMS/CDC Table of Neoplasms: the behavior documented for that site — malignant primary, secondary, carcinoma in situ, benign, uncertain or unspecified — decides which column, and therefore which code, applies.

Side by side

	C77.9Secondary and unspecified malignant neoplasm of lymph node, unspecified	D48.7Neoplasm of uncertain behavior of other specified sites
Billing status	Billable	Billable
Classification	C00-D49 — Neoplasms	C00-D49 — Neoplasms
Definition	Secondary and unspecified malignant neoplasm of lymph node, unspecified is a billable ICD-10-CM diagnosis code (C77.9).	Neoplasm of uncertain behavior of other specified sites is a billable ICD-10-CM diagnosis code (D48.7).
Includes	—	Neoplasm of uncertain behavior of eye Neoplasm of uncertain behavior of heart Neoplasm of uncertain behavior of peripheral nerves of orbit

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Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources