C34.90 Malignant neoplasm of unspecified part of unspecified bronchus or lung
The ICD-10-CM code for Malignant neoplasm of unspecified part of unspecified bronchus or lung is C34.90 (FY2026). It is a billable, claim-ready diagnosis code.
Classification
- Chapter
- 2: Neoplasms (C00-D49)
- Section
- C30-C39: Malignant neoplasms of respiratory and intrathoracic organs (C30-C39)
- Category C34
- 22 codes (16 billable)
- FY2026 Status
- Stable since FY2024
Also Known As
ICD-10-CM Alphabetic Index entries that lead to C34.90:
- Cancer › lung
- Carcinoma (malignant) › oat cell › unspecified site
- Carcinoma (malignant) › small cell › large cell › unspecified site
- Carcinoma (malignant) › large cell › small cell › unspecified site
- Carcinoma (malignant) › small cell › intermediate cell › unspecified site
- Carcinoma (malignant) › small cell › fusiform cell › unspecified site
Inclusion Terms
- Lung cancer NOS
U.S. Hospital Utilization
- An estimated 135,200 U.S. inpatient stays in 2023 included C34.90 among the documented diagnoses.
- 13,985 stays listed it as the principal diagnosis.
Source: National Inpatient Sample (NIS), Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality, 2016–2023. National survey-weighted estimates.
Prevalence & Statistics
- An estimated 229,410 new cases of lung and bronchus cancer will be diagnosed in the United States in 2026, and an estimated 124,990 people will die of the disease. (NCI SEER Cancer Stat Facts: Lung and Bronchus Cancer, 2026)
Official Coding Guidelines
Tx of primary site (TOC entry)a. Admission/Encounter for treatment of primary site ............................................................. 33
Tx of secondary site (TOC entry)b. Admission/Encounter for treatment of secondary site .......................................................... 33
Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026