C34.90 ICD-10-CM Code: Malignant neoplasm of unspecified part of unspecified bronchus or lung
C34.90 is the billable ICD-10-CM code for “Malignant neoplasm of unspecified part of unspecified bronchus or lung” in the FY 2027 U.S. code set, effective Oct 1, 2026.
Official description
C34.90Malignant neoplasm of unspecified part of unspecified bronchus or lung
ICD-10-CM diagnosis code · United States clinical modification
Coding tips for C34.90
The same condition with the side named
This code leaves the side unspecified, which should be rare. When the note says which side, use that side’s code.
Where C34.90 sits
- 1
Chapter 2
Neoplasms (C00-D49)
- 2
Section
Malignant neoplasms of respiratory and intrathoracic organs (C30-C39)
- 3
Category C34
Malignant neoplasm of bronchus and lung
- 4
Subcategory C34.9
Malignant neoplasm of unspecified part of bronchus or lung
- 5
Code C34.90
Malignant neoplasm of unspecified part of unspecified bronchus or lung
Notes for this code
Inclusion terms
- Lung cancer NOS
Code first
No “code first” instruction is listed for C34.90.
Use additional code
No “use additional code” instruction is listed for C34.90.
Excludes1
Conditions that should not be reported together with this code.
No Excludes1 note is listed for C34.90.
Excludes2
Conditions not included here that may be reported separately when present.
No Excludes2 note is listed for C34.90.
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.
Frequently asked questions
What does ICD-10-CM code C34.90 mean?
C34.90 is the FY 2027 U.S. ICD-10-CM code for “Malignant neoplasm of unspecified part of unspecified bronchus or lung.”
Is C34.90 a billable or specific ICD-10-CM code?
Yes. In the FY 2027 reference data used on this page, C34.90 has no child codes and is presented as a billable/specific code. Always confirm the active code set and payer requirements before use.
Where is C34.90 located in ICD-10-CM?
C34.90 is listed in Chapter 2, Neoplasms (C00-D49), within Malignant neoplasms of respiratory and intrathoracic organs (C30-C39) (C30–C39), under category C34, Malignant neoplasm of bronchus and lung and subcategory C34.9, Malignant neoplasm of unspecified part of bronchus or lung.
What coding notes are listed for C34.90?
Its listed inclusion terms are Lung cancer NOS. No code-first instruction is listed. No Excludes1 note is listed. No Excludes2 note is listed.