ICD-10-CM 2027 diagnosis code
C78.3Secondary malignant neoplasm of other and unspecified respiratory organs
C78.3 is a header code, so it can't be reported by itself. Choose one of the 4 more specific codes beneath it.Short description: Secondary malignant neoplasm of and unsp respiratory organs
Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data
About C78.3
C78.3 is the ICD-10-CM diagnosis code for secondary malignant neoplasm of other and unspecified respiratory organs. It belongs to category C78 (secondary malignant neoplasm of respiratory and digestive organs), block C76-C80 (malignant neoplasms of ill-defined, other secondary and unspecified sites) and chapter 2 (neoplasms). It is a header code, so it can't be reported by itself; one of its 4 subcodes must be used instead.
Within C78, choose C78.3 (other and unspecified respiratory organs) only when documentation doesn't support a more specific option: lung (C78.0), mediastinum (C78.1), pleura (C78.2), small intestine (C78.4), large intestine and rectum (C78.5), retroperitoneum and peritoneum (C78.6), liver and intrahepatic bile duct (C78.7) and other and unspecified digestive organs (C78.8).
To report this condition, pick the subcode that matches the documentation: C78.30 (organ), C78.31 (larynx), C78.32 (pharynx) and C78.39 (organs).
It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
Specific codes under C78.3
Notes that apply from higher levels
Instructions written at a parent level also apply to C78.3.
Broader instructions also apply from Chapter 2: Neoplasms.
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about C78.3
Is C78.3 billable?
- No. C78.3 is a header code. Report one of its more specific subcodes instead.