C34 – Malignant neoplasm of bronchus and lung

ICD-10-CM 2027 diagnosis code · Malignant neoplasms of respiratory and intrathoracic organs

Non-billable header

ICD-10-CM code C34

Code: C34 (claims format: C34)
Description: Malignant neoplasm of bronchus and lung
Billable: No – use a more specific code below
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 2. Neoplasms (C00-D49)
Block: C30-C39 Malignant neoplasms of respiratory and intrathoracic organs

Billable codes under C34

C34 is a header code and cannot be used on claims. Choose the most specific code:

C34.0 – Malignant neoplasm of main bronchusHeader (more codes below)
C34.1 – Malignant neoplasm of upper lobe, bronchus or lungHeader (more codes below)
C34.2 – Malignant neoplasm of middle lobe, bronchus or lungBillable
C34.3 – Malignant neoplasm of lower lobe, bronchus or lungHeader (more codes below)
C34.8 – Malignant neoplasm of overlapping sites of bronchus and lungHeader (more codes below)
C34.9 – Malignant neoplasm of unspecified part of bronchus or lungHeader (more codes below)

Notes for C34

Excludes1 (not coded here):

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)

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

Block C30-C39

Includes:

malignant neoplasm of middle ear

Excludes1 (not coded here):

mesothelioma (C45.-)

Frequently asked questions

What is ICD-10 code C34?

C34 is the ICD-10-CM code for malignant neoplasm of bronchus and lung, in the block C30-C39 (Malignant neoplasms of respiratory and intrathoracic organs).

Is C34 a billable code?

No. C34 is a header code with more specific child codes; report one of the billable codes listed above.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.