ICD-9-CM diagnosis code (retired)
165.8 — Malignant neoplasm of other sites within the respiratory system and intrathoracic organs
ICD-9-CM was replaced by ICD-10 on October 1, 2015. These are the ICD-10-CM equivalents from the CMS General Equivalence Mappings.
About ICD-9-CM 165.8
165.8 is an ICD-9-CM diagnosis code for malignant neoplasm of other sites within the respiratory system and intrathoracic organs. ICD-9-CM was retired for U.S. claims on October 1, 2015, when ICD-10-CM took over.
The CMS General Equivalence Mappings translate it to one ICD-10-CM code, C39.9 (Malignant neoplasm of lower respiratory tract, part unspecified). The match is approximate, so confirm it against the record.
ICD-10-CM equivalents
- C39.9Malignant neoplasm of lower respiratory tract, part unspecifiedapproximate
Common questions about 165.8
What is the ICD-10 code for ICD-9 165.8?
- The GEMs map 165.8 to ICD-10-CM C39.9.
GEMs are a translation aid, not a substitute for coding from the record. The 2027 ICD-10 code set has changed since the last GEMs release in 2018. Page updated September 29, 2026.