C78.3Header code — not billable
Secondary malignant neoplasm of other and unspecified respiratory organs
Short description: Secondary malignant neoplasm of and unsp respiratory organs
- Chapter
- 2. Neoplasms
- Category
- C78
- Effective date
- October 1, 2026
Related codes in category C78
C78Secondary malignant neoplasm of resp and digestive organsC78.0Secondary malignant neoplasm of lungC78.00Secondary malignant neoplasm of unspecified lungYesC78.01Secondary malignant neoplasm of right lungYesC78.02Secondary malignant neoplasm of left lungYesC78.1Secondary malignant neoplasm of mediastinumYesC78.2Secondary malignant neoplasm of pleuraYesC78.30Secondary malignant neoplasm of unsp respiratory organYesC78.31Secondary malignant neoplasm of larynxYesC78.32Secondary malignant neoplasm of pharynxYesC78.39Secondary malignant neoplasm of other respiratory organsYesC78.4Secondary malignant neoplasm of small intestineYes
Frequently asked questions
What is ICD-10 code C78.3?
C78.3 is an ICD-10-CM diagnosis code for Secondary malignant neoplasm of other and unspecified respiratory organs.
Is C78.3 a billable code?
No. C78.3 is a category/header code, not billable on its own — use one of its more specific child codes instead.
What ICD-10-CM chapter is C78.3 in?
C78.3 falls under Chapter 2: Neoplasms.
When did C78.3 become effective?
C78.3 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.
What other codes are related to C78.3?
C78.3 belongs to category C78, which includes 12 other codes — see the related codes list on this page.
ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.