2027 ICD-10-CM Diagnosis Code C34Malignant neoplasm of bronchus and lung

ICD-10-CM Codes›C00–D49›C30-C39›C34

ICD-10-CM C34
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

C34 is a non-billable ICD-10-CM category code for malignant neoplasm of bronchus and lung, so it cannot be submitted on claims. Use a more specific code from this category instead, such as C34.00, C34.01, C34.02, and C34.10.

Code Identity

ICD-10-CM Code
C34
Billable Status
No — Non-Billable Category
Code Describes
Malignant neoplasm of bronchus and lung
Short Description
Malignant neoplasm of bronchus and lung
Same as the full description in the CMS dataset.
Chapter
C30-C39
Malignant neoplasms of respiratory and intrathoracic organs

Code Classification

ChapterC00–D49Neoplasms
SectionC30-C39Malignant neoplasms of respiratory and intrathoracic organs
CategoryC34Malignant neoplasm of bronchus and lung
This CodeC34Malignant neoplasm of bronchus and lung

Specific Coding for Malignant neoplasm of bronchus and lungOverview

Non-specific codes like C34 require more characters. Use one of these billable codes instead:

  • C34.0 for Malignant neoplasm of main bronchus

  • Use C34.00 for Malignant neoplasm of unspecified main bronchus

  • Use C34.01 for Malignant neoplasm of right main bronchus

  • Use C34.02 for Malignant neoplasm of left main bronchus

  • C34.1 for Malignant neoplasm of upper lobe, bronchus or lung

  • Use C34.10 for Malignant neoplasm of upper lobe, unspecified bronchus or lung

  • Use C34.11 for Malignant neoplasm of upper lobe, right bronchus or lung

  • Use C34.12 for Malignant neoplasm of upper lobe, left bronchus or lung

  • Use C34.2 for Malignant neoplasm of middle lobe, bronchus or lung

  • C34.3 for Malignant neoplasm of lower lobe, bronchus or lung

  • Use C34.30 for Malignant neoplasm of lower lobe, unspecified bronchus or lung

  • Use C34.31 for Malignant neoplasm of lower lobe, right bronchus or lung

  • Use C34.32 for Malignant neoplasm of lower lobe, left bronchus or lung

  • C34.8 for Malignant neoplasm of overlapping sites of bronchus and lung

  • Use C34.80 for Malignant neoplasm of overlapping sites of unspecified bronchus and lung

  • Use C34.81 for Malignant neoplasm of overlapping sites of right bronchus and lung

  • Use C34.82 for Malignant neoplasm of overlapping sites of left bronchus and lung

  • C34.9 for Malignant neoplasm of unspecified part of bronchus or lung

  • Use C34.90 for Malignant neoplasm of unspecified part of unspecified bronchus or lung

  • Use C34.91 for Malignant neoplasm of unspecified part of right bronchus or lung

  • Use C34.92 for Malignant neoplasm of unspecified part of left bronchus or lung

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to C34: its own notes plus those printed at block C30-C39 and Chapter 2. A note printed at a category, block or chapter applies to every code under it.

Includes

Further defines, or gives examples of, the content of the category.

From Block C30-C39 Malignant neoplasms of respiratory and intrathoracic organs applies to 40 codes
  • malignant neoplasm of middle ear

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

On C34 itself
  • Kaposi's sarcoma of lung (C46.5-)
  • malignant carcinoid tumor of the bronchus and lung (C7A.090)
From Block C30-C39 Malignant neoplasms of respiratory and intrathoracic organs applies to 40 codes

Use Additional Code

Add a second code, after this one, to fully describe the condition.

  • 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

General instructions on how these codes are used.

From Chapter 2 (C00-D49) Neoplasms applies to 1,730 codes
  • Functional activity
  • All neoplasms are classified in this chapter, whether they are functionally active or not. An additional code from Chapter 4 may be used, to identify functional activity associated with any neoplasm.
  • Morphology [Histology]
  • Chapter 2 classifies neoplasms primarily by site (topography), with broad groupings for behavior, malignant, in situ, benign, etc. The Table of Neoplasms should be used to identify the correct topography code. In a few cases, such as for malignant melanoma and certain neuroendocrine tumors, the morphology (histologic type) is included in the category and codes.
  • Primary malignant neoplasms overlapping site boundaries
  • A primary malignant neoplasm that overlaps two or more contiguous (next to each other) sites should be classified to the subcategory/code .8 ('overlapping lesion'), unless the combination is specifically indexed elsewhere. For multiple neoplasms of the same site that are not contiguous, such as tumors in different quadrants of the same breast, codes for each site should be assigned.
  • Malignant neoplasm of ectopic tissue
  • Malignant neoplasms of ectopic tissue are to be coded to the site mentioned, e.g., ectopic pancreatic malignant neoplasms are coded to pancreas, unspecified (C25.9).

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name C34, its category, or a range that includes it.

Applicable To 2

These notes mention C34.

  • Z85.118 Personal history of other malignant neoplasm of bronchus and lung
    Conditions classifiable to C34
  • Z80.1 Family history of malignant neoplasm of trachea, bronchus and lung
    Conditions classifiable to C33-C34 names C33-C34, which includes this code

Excludes2 1

These codes carry an Excludes2 note naming C34: its condition is not part of those codes, and both may be reported when the patient has both.

  • Block J60-J70 Lung diseases due to external agents
    malignant neoplasm of bronchus and lung (C34.-)

Code First 1

These codes say to code first a condition named in the note, and C34 is one of the conditions named.

  • J93.12 Secondary spontaneous pneumothorax
    malignant neoplasm of bronchus and lung (C34.-)

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Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About C34Overview

What is the ICD-10 code for malignant neoplasm of bronchus and lung?

C34 is the ICD-10-CM category for malignant neoplasm of bronchus and lung, but it is a non-billable header: claims need a more specific code from this category, listed on this page.

Is C34 (Malignant neoplasm of bronchus and lung) a billable code?

No. This is a category header that groups the codes for malignant neoplasm of bronchus and lung, and headers cannot be submitted on claims. Claims for malignant neoplasm of bronchus and lung need a more specific code from this category, such as C34.00, C34.01, and C34.02.

Can C34 be reported with a code from C46.5?

Not as a rule. The Excludes1 note on C34 lists "Kaposi's sarcoma of lung (C46.5-)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).

Does C34 need an additional code?

When the condition applies, yes. The Use Additional Code note reads: 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.-); and 1 more listed in the Instructional Notes section. The additional code is reported after C34.