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C34.90 — Malignant neoplasm of unspecified part of unspecified bronchus or lung
C34.90
What this code means
Cancer that starts in the lung tissue or airways.
Also called: lung cancer, bronchogenic carcinoma.
When this code is used
Used for malignant neoplasm of a bronchus or lung when the side and part are not specified.
Where it sits in ICD-10-CM
Code C34.90 belongs to Chapter 2: Neoplasms, which covers codes C00–D49 in the FY2027 ICD-10-CM tabular list. The official description above is copied verbatim from the CDC/NCHS FY2027 code file.
Learn more about this condition
Related symptoms
Related anatomy
Watch: related videos
Frequently asked questions
What is ICD-10-CM code C34.90?
C34.90 is the ICD-10-CM diagnosis code for “Malignant neoplasm of unspecified part of unspecified bronchus or lung”. Cancer that starts in the lung tissue or airways.
When is code C34.90 used?
Used for malignant neoplasm of a bronchus or lung when the side and part are not specified. It belongs to Chapter 2 of ICD-10-CM (Neoplasms).
This guide explains ICD-10-CM codes in plain language for patients, students and other readers. It is educational information only — not coding, billing or medical advice. The code recorded for any real encounter is assigned from the full clinical documentation by the treating team and qualified coders, and only they can decide which code fits a specific case.