U.S. ICD-10-CM · FY 2027

C39 ICD-10-CM Code: Malignant neoplasm of other and ill-defined sites in the respiratory system and intrathoracic organs

A clear reference for the official code description, hierarchy, and related coding information from the FY 2027 U.S. release.

Code definition

Official description

C39

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

ICD-10-CM diagnosis code · United States clinical modification

Classification

Where C39 sits

  1. 1

    Chapter 2

    Neoplasms (C00-D49)

  2. 2

    Section

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

  3. 3

    Category C39

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

  4. 4

    Code C39

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

More specific choices

Codes under C39

C39 is a non-billable category. Choose the child code that best matches the documented diagnosis.

C39.0

Malignant neoplasm of upper respiratory tract, part unspecified

C39.9

Malignant neoplasm of lower respiratory tract, part unspecified

Documentation details

Notes for this code

Inclusion terms

No inclusion terms are listed for C39.

Code first

No “code first” instruction is listed for C39.

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)

Excludes1

Conditions that should not be reported together with this code.

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

Excludes2

Conditions not included here that may be reported separately when present.

No Excludes2 note is listed for C39.

Transparency

Source and release

Data release

U.S. ICD-10-CM · FY 2027

Effective date

Oct 1, 2026

Publisher

Vero Scribe Inc.

This reference is generated from Vero’s ICD-10-CM description, hierarchy, and code-note dataset. The visible content and structured data share that source.

Review the CDC/NCHS ICD-10-CM source

Code-specific guidance

Frequently asked questions

What does ICD-10-CM code C39 mean?

C39 is the FY 2027 U.S. ICD-10-CM code for “Malignant neoplasm of other and ill-defined sites in the respiratory system and intrathoracic organs.”

Is C39 a billable or specific ICD-10-CM code?

No. C39 has more specific child codes in the FY 2027 reference data. Select the code that matches the documentation and confirm the active code set and payer requirements.

Where is C39 located in ICD-10-CM?

C39 is listed in Chapter 2, Neoplasms (C00-D49), within Malignant neoplasms of respiratory and intrathoracic organs (C30-C39) (C30–C39), under category C39, Malignant neoplasm of other and ill-defined sites in the respiratory system and intrathoracic organs.

What coding notes are listed for C39?

No inclusion terms are listed for C39 in this reference record. No code-first instruction is listed. Additional-code instructions: 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). Excludes1 notes: intrathoracic malignant neoplasm NOS (C76.1); thoracic malignant neoplasm NOS (C76.1). No Excludes2 note is listed.

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