ICD-9-CM diagnosis code (retired)
159.9 — Malignant neoplasm of ill-defined sites within the digestive organs and peritoneum
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 159.9
159.9 is an ICD-9-CM diagnosis code for malignant neoplasm of ill-defined sites within the digestive organs and peritoneum. 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, C26.9 (Malignant neoplasm of ill-defined sites within the digestive system). The match is approximate, so confirm it against the record.
ICD-10-CM equivalents
- C26.9Malignant neoplasm of ill-defined sites within the digestive systemapproximate
Common questions about 159.9
What is the ICD-10 code for ICD-9 159.9?
- The GEMs map 159.9 to ICD-10-CM C26.9.
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.