Is ICD-10-CM code C39 billable?

No, C39 (Malignant neoplasm of other and ill-defined sites in the respiratory system and intrathoracic organs) is a non-billable ICD-10-CM code. It must be coded to a more specific subcategory before it can be used for reimbursement.

What chapter does ICD-10-CM code C39 belong to?

C39 belongs to Chapter 2 of the ICD-10-CM tabular list: C00–D49 (Neoplasms).

C39Non-billable

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

Neoplasms·Malignant neoplasms of respiratory and intrathoracic organs (C30-C39)·category·FY 2026

Use a more specific code (2 billable)

C39.0Malignant neoplasm of upper respiratory tract, part unspecified C39.9Malignant neoplasm of lower respiratory tract, part unspecified

C30-C39 Parent Instructions

Includes

malignant neoplasm of middle ear

Excludes1(Not coded here. Use a different code.)

mesothelioma (C45.-)

Instructional Notes

Excludes1(Not coded here. Use a different code.)

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)

Clinical Hierarchy

BillableHas subcodes

CH2Neoplasms (C00-D49)

C30-C39Malignant neoplasms of respiratory and intrathoracic organs (C30-C39)

C39Malignant neoplasm of other and ill-defined sites in the respiratory system and intrathoracic organsNot billable

C39.0Malignant neoplasm of upper respiratory tract, part unspecifiedBillable

C39.9Malignant neoplasm of lower respiratory tract, part unspecifiedBillable

MS-DRG Classification

2026

No direct MS-DRG triggers identified.