ICD-10-CM diagnosis code
C34.90 Malignant neoplasm of unspecified part of unspecified bronchus or lung
- Billable
- Yes, a complete code (FY2026)
- Chapter
- 2. Neoplasms
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Other codes in C34
16 complete codes in this category.
- C34.11Malignant neoplasm of upper lobe, right bronchus or lung
- C34.12Malignant neoplasm of upper lobe, left bronchus or lung
- C34.2Malignant neoplasm of middle lobe, bronchus or lung
- C34.30Malignant neoplasm of lower lobe, unspecified bronchus or lung
- C34.31Malignant neoplasm of lower lobe, right bronchus or lung
- C34.32Malignant neoplasm of lower lobe, left bronchus or lung
- C34.80Malignant neoplasm of overlapping sites of unspecified bronchus and lung
- C34.81Malignant neoplasm of overlapping sites of right bronchus and lung
- C34.82Malignant neoplasm of overlapping sites of left bronchus and lung
- C34.90Malignant neoplasm of unspecified part of unspecified bronchus or lung
- C34.91Malignant neoplasm of unspecified part of right bronchus or lung
- C34.92Malignant neoplasm of unspecified part of left bronchus or lung
Documentation tips
- Make sure the note supports every element of the title, “Malignant neoplasm of unspecified part of unspecified bronchus or lung”: each detail in it should be traceable to the history, examination or assessment.
- Code to the highest specificity the documentation supports. If a detail is missing from the note, add it to the note rather than choosing a less specific code by default.
- Check the Tabular List and official guidelines for instructional notes (“code first”, “use additional code”, Excludes1/Excludes2) that apply to C34.
The international WHO ICD-10 also has C34, with its inclusion and exclusion notes; titles and detail can differ from ICD-10-CM.
ICD-10-CM is developed by the National Center for Health Statistics (NCHS), Centers for Disease Control and Prevention, U.S. Department of Health and Human Services, and is based on the WHO ICD-10. Codes and titles are reproduced unchanged from the FY2026 code list (effective 1 October 2025). Their use here does not imply endorsement by CDC, HHS or the U.S. Government. Changes effective on or after 1 October 2026 may not be reflected yet; check the current release at cdc.gov or cms.gov before submitting claims.
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