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D40.1 vs D44

D40.1 (Neoplasm of uncertain behavior of testis) compared with D44 (Neoplasm of uncertain behavior of endocrine glands), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1.

Can these codes be reported together?

No — do not report together. D44 carries an Excludes1 note covering D40.1: “neoplasm of uncertain behavior of testis (D40.1-)”

Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).

Side by side

D40.1Neoplasm of uncertain behavior of testisD44Neoplasm of uncertain behavior of endocrine glands
Billing statusNon-billable header

Report instead: D40.10, D40.11, D40.12

Non-billable header

Report instead: D44.0, D44.10, D44.11, D44.12, D44.2

ClassificationC00-D49 — Neoplasms (C00-D49)C00-D49 — Neoplasms (C00-D49)
DefinitionNeoplasm of uncertain behavior of testis is a non-billable ICD-10-CM category code (D40.1).Neoplasm of uncertain behavior of endocrine glands is a non-billable ICD-10-CM category code (D44).
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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