Billable / Specific Code
ICD-10-CM C39.9 is the diagnosis code for Malignant neoplasm of lower respiratory tract, part unspecified. This code falls under the section "Malignant neoplasms of respiratory and intrathoracic organs" within Chapter 2 — Neoplasms (C00-D49). It is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. Medical coders and healthcare providers use this code to document and classify diagnoses in electronic health records, insurance claims, and clinical databases.
Understanding where C39.9 sits in the ICD-10-CM classification helps ensure proper coding:
Yes, C39.9 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
C39.9 is the ICD-10-CM diagnosis code for "Malignant neoplasm of lower respiratory tract, part unspecified". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
The parent code of C39.9 is C39 ("Malignant neoplasm of other and ill-defined sites in the respiratory system and intrathoracic organs"). C39.9 provides a more specific classification within this category.
C39.9 is located in Section C30-C39 — "Malignant neoplasms of respiratory and intrathoracic organs" within Chapter 2 of the ICD-10-CM Tabular List.
Use C39.9 when the patients documented diagnosis matches "Malignant neoplasm of lower respiratory tract, part unspecified" 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 lower respiratory tract, part unspecified is C39.9.
Yes, C39.9 can be used as a primary diagnosis code since it is billable and specific.
C39.9 is in Chapter 2 of the ICD-10-CM Tabular List.
Yes, C39.9 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.