ICD-9-CM procedure code (retired)
89.66 — Measurement of mixed venous blood gases
ICD-9-CM was replaced by ICD-10 on October 1, 2015. These are the ICD-10-PCS equivalents from the CMS General Equivalence Mappings.
About ICD-9-CM 89.66
89.66 is an ICD-9-CM procedure code for measurement of mixed venous blood gases. ICD-9-CM was retired for U.S. claims on October 1, 2015, when ICD-10-PCS took over.
The CMS General Equivalence Mappings translate it to 2 ICD-10-PCS codes, such as 4A043R1 (Measurement of Venous Saturation, Peripheral, Percutaneous Approach) and 4A04XR1 (Measurement of Venous Saturation, Peripheral, External Approach). All of these are approximate matches, so review the record to pick the right one.
ICD-10-PCS equivalents
Common questions about 89.66
What is the ICD-10 code for ICD-9 89.66?
- The GEMs map 89.66 to ICD-10-PCS 4A043R1 and 4A04XR1.
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.