C34.90

Billable
ChapterC00–D49
Ranksubcategory
Official Description

Malignant neoplasm of unspecified part of unspecified bronchus or lung

Metadata & Insights
  • •2026 ICD-10-CM Edition - Effective October 1, 2025.
  • •Billable/specific code (valid for reimbursement).
  • •Chapter 2: Neoplasms (C00-D49).

Instructional Notes

Includes
  • Lung cancer NOS
General instructions are available for the parent sections:
View C30-C39 NotesView C34 Notes

Clinical Hierarchy

CH2Neoplasms (C00-D49)
C30-C39Malignant neoplasms of respiratory and intrathoracic organs (C30-C39)
C34Malignant neoplasm of bronchus and lung
C34.9Malignant neoplasm of unspecified part of bronchus or lung
C34.90Malignant neoplasm of unspecified part of unspecified bronchus or lung

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to C34.90:

categoryC34
Malignant neoplasm of bronchus and lung
View context instructions
blockC30-C39
Malignant neoplasms of respiratory and intrathoracic organs (C30-C39)
View context instructions

Alphabetic Index Mentions

These are Diagnosis Index lookup paths that route to C34.90. Use them as entry terms for search, then confirm final coding instructions in the Tabular List and notes above.

6 raw paths
Cancer1 unique routes
lung→C34.90
Carcinoma (malignant)5 unique routes
large cell
small cell
unspecified site→C34.90
oat cell
unspecified site→C34.90
small cell(3 variants)
fusiform cell
unspecified site→C34.90
intermediate cell
unspecified site→C34.90
large cell
unspecified site→C34.90

MS-DRG Classification

2026 v43.1

This code is grouped within the following Diagnosis Related Group(s) for clinical reimbursement:

DRG 180
Respiratory Neoplasms with MCC
DRG 181
Respiratory Neoplasms with CC
DRG 182
Respiratory Neoplasms without CC/MCC

Cross Reference

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