C39: Malignant neoplasm of other and ill-defined sites in the respiratory system and intrathoracic organs
Codes under C39 (Malignant neoplasm of other and ill-defined sites in the respiratory system and intrathoracic organs). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.
| Code | Description | Billable |
|---|---|---|
| C39.0 | Malignant neoplasm of upper respiratory tract, part unspecified | ✓ |
| C39.0 | Malignant neoplasm of upper respiratory tract, part unspecified | ✓ |
| C39.9 | Malignant neoplasm of lower respiratory tract, part unspecified | ✓ |
| C39.9 | Malignant neoplasm of lower respiratory tract, part unspecified | ✓ |
Frequently asked questions
What is ICD-10-CM code C39?
C39 is an ICD-10-CM category covering Malignant neoplasm of other and ill-defined sites in the respiratory system and intrathoracic organs. It contains 4 more specific diagnosis codes, 4 of which are billable.
Is C39 a billable code?
No — C39 is a category header and isn't billable on its own. Code to the highest level of specificity using one of its subcodes (for example C39.0 — Malignant neoplasm of upper respiratory tract, part unspecified). 4 of the 4 codes under C39 are billable.
What codes fall under C39?
C39 includes C39.0, C39.0, C39.9, C39.9. See the full list with descriptions and billable status above.
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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.
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