C39 vs C76.1
C39 (Malignant neoplasm of other and ill-defined sites in the respiratory system and intrathoracic organs) compared with C76.1 (Malignant neoplasm of thorax), 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. C39 carries an Excludes1 note covering C76.1: “intrathoracic malignant neoplasm NOS (C76.1)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
No — do not report together. C39 carries an Excludes1 note covering C76.1: “thoracic malignant neoplasm NOS (C76.1)”
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
| C39Malignant neoplasm of other and ill-defined sites in the respiratory system and intrathoracic organs | C76.1Malignant neoplasm of thorax | |
|---|---|---|
| Billing status | Non-billable header | Billable |
| Classification | C00-D49 — Neoplasms (C00-D49) | C00-D49 — Neoplasms (C00-D49) |
| Definition | Malignant neoplasm of other and ill-defined sites in the respiratory system and intrathoracic organs is a non-billable ICD-10-CM category code (C39). | Malignant neoplasm of thorax is a billable ICD-10-CM diagnosis code (C76.1). |
| Includes | malignant neoplasm of middle ear | Intrathoracic malignant neoplasm NOS Malignant neoplasm of axilla NOS Thoracic malignant neoplasm NOS |
| Use additional code | code to identify: exposure to environmental tobacco smoke (Z77.22) exposure to tobacco smoke in the perinatal period (P96.81) | — |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources