C34.02 Malignant neoplasm of left main bronchus

Billable ICD-10-CM code, FY2026. Acts as a Complication or Comorbidity (CC) as a secondary diagnosis.

Applies from C34 Malignant neoplasm of bronchus and lung

Excludes1 (never code together)

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

Use additional code

• 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)

Applies from C34.0 Malignant neoplasm of main bronchus

Applicable to

• Malignant neoplasm of carina
• Malignant neoplasm of hilus (of lung)

Risk adjustment (HCC)

• CMS-HCC V28: HCC 20 — Lung and Other Severe Cancers
• CMS-HCC V22: HCC 9 — Lung and Other Severe Cancers
• RxHCC V08: HCC 20 — Lung, Kidney, and Other Cancers; Secondary Cancer of Lymph Nodes and Other Sites
• ESRD V24: HCC 9

MS-DRG index

Defines the logic of DRG(s) 180-182 in MDC 04.

Approximate ICD-9-CM (GEMs)

• 162.2 Malignant neoplasm of main bronchus (approximate)

Code annotations containing back-references to C34.02

Back-references to C34

• Code First: J93.12 Secondary spontaneous pneumothorax ("malignant neoplasm of bronchus and lung (C34.-)")

Nearby codes

• C34 Malignant neoplasm of bronchus and lung
• C34.0 Malignant neoplasm of main bronchus
• C34.00 Malignant neoplasm of unspecified main bronchus
• C34.01 Malignant neoplasm of right main bronchus
• C34.02 Malignant neoplasm of left main bronchus (this code)
• C34.1 Malignant neoplasm of upper lobe, bronchus or lung
• C34.10 Malignant neoplasm of upper lobe, unspecified bronchus or lung
• C34.11 Malignant neoplasm of upper lobe, right bronchus or lung
• C34.12 Malignant neoplasm of upper lobe, left bronchus or lung
• C34.2 Malignant neoplasm of middle lobe, bronchus or lung