C77 vs C93

C77 (Secondary and unspecified malignant neoplasm of lymph nodes) compared with C93 (Monocytic leukemia), from the official CMS tabular data. Both may be reported when both conditions are documented (Excludes2).

Can these codes be reported together?

Yes, when both are documented. C93 carries an Excludes2 note covering C77: “secondary and unspecified neoplasm of lymph nodes (C77.-)”

Excludes2 marks distinct conditions — both may be reported when both are documented.

Side by side

	C77Secondary and unspecified malignant neoplasm of lymph nodes	C93Monocytic leukemia
Billing status	Non-billable header Report instead: C77.0, C77.1, C77.2, C77.3, C77.4	Non-billable header Report instead: C93.00, C93.01, C93.02, C93.10, C93.11
Classification	C00-D49 — Neoplasms (C00-D49)	C00-D49 — Neoplasms (C00-D49)
Definition	Secondary and unspecified malignant neoplasm of lymph nodes is a non-billable ICD-10-CM category code (C77).	Monocytic leukemia is a non-billable ICD-10-CM category code (C93).
Includes	—	monocytoid leukemia

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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