C39 – Malignant neoplasm of other and ill-defined sites in the respiratory system and intrathoracic organs

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

Non-billable header

ICD-10-CM code C39

Code: C39 (claims format: C39)
Description: Malignant neoplasm of other and ill-defined sites in the respiratory system and intrathoracic organs
Short description: Malig neoplm of sites in the resp sys and intrathorac organs
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 C39

C39 is a header code and cannot be used on claims. Choose the most specific code:

Notes for C39

Excludes1 (not coded here):

intrathoracic malignant neoplasm NOS (C76.1)
thoracic malignant neoplasm NOS (C76.1)

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 C39?

C39 is the ICD-10-CM code for malignant neoplasm of other and ill-defined sites in the respiratory system and intrathoracic organs, in the block C30-C39 (Malignant neoplasms of respiratory and intrathoracic organs).

Is C39 a billable code?

No. C39 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.