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C34.3

⚠ Non-billable (Header)

Malignant neoplasm of lower lobe, bronchus or lung

Neoplasms (C00-D49)

⚠️ This is a category header code — not billable. Use a more specific child code below.

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❌ Excludes1

inherited from C34

Rules from parent category C34: Malignant neoplasm of bronchus and lung

  • • Kaposi's sarcoma of lung (C46.5-)
  • • malignant carcinoid tumor of the bronchus and lung (C7A.090)

📋 Code Instructions

from C34
  • • code to identify:
  • • exposure to environmental tobacco smoke (Z77.22)
  • • exposure to tobacco smoke in the perinatal period (P96.81)
  • • history of tobacco dependence (Z87.891)
  • • occupational exposure to environmental tobacco smoke (Z57.31)
  • • tobacco dependence (F17.-)
  • • tobacco use (Z72.0)

Child Codes (3)

C34.30Malignant neoplasm of lower lobe, unspecified bronchus or lungC34.31Malignant neoplasm of lower lobe, right bronchus or lungC34.32Malignant neoplasm of lower lobe, left bronchus or lung

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Code Information

CodeC34.3
BillableNo — Header code
ParentC34
CategoryNeoplasms (C00-D49)
Excludes12 rule(s)
Excludes20 note(s)
Child codes3

Data Source

CMS ICD-10-CM 2026 Tabular List

Updated October 1, 2025 (FY2026)