Non-Billable / Non-Specific Code
ICD-10-CM C39 is the diagnosis code for Malignant neoplasm of other and ill-defined sites in the respiratory system and intrathoracic organs. This code falls under the section "Malignant neoplasms of respiratory and intrathoracic organs" within Chapter 2 — Neoplasms (C00-D49). It is a non-billable/non-specific ICD-10-CM code that should not be used for reimbursement. A more specific sub-code is required for billing. Medical coders and healthcare providers use this code to document and classify diagnoses in electronic health records, insurance claims, and clinical databases.
The following conditions should never be coded at the same time as C39. They are mutually exclusive:
Understanding where C39 sits in the ICD-10-CM classification helps ensure proper coding:
No, C39 is a non-billable/non-specific code. You should use a more specific sub-code for billing and reimbursement.
C39 is the ICD-10-CM diagnosis code for "Malignant neoplasm of other and ill-defined sites in the respiratory system and intrathoracic organs". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
C39 is located in Section C30-C39 — "Malignant neoplasms of respiratory and intrathoracic organs" within Chapter 2 of the ICD-10-CM Tabular List.
C39 has 2 sub-code(s) that provide more specific detail: C39.0, C39.9.
Use C39 when the patients documented diagnosis matches "Malignant neoplasm of other and ill-defined sites in the respiratory system and intrathoracic organs" and the clinical documentation supports this level of specificity. Always verify with the latest ICD-10-CM guidelines and payer requirements.
The ICD-10-CM code for Malignant neoplasm of other and ill-defined sites in the respiratory system and intrathoracic organs is C39.
No, C39 is non-billable. Use a more specific sub-code for primary diagnosis billing.
C39 is in Chapter 2 of the ICD-10-CM Tabular List.
Type 1 Excludes for C39 include: intrathoracic malignant neoplasm NOS (C76.1); thoracic malignant neoplasm NOS (C76.1).
Yes, C39 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.