ICD-9-CM procedure code (retired)
36.31 — Open chest transmyocardial revascularization
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 36.31
36.31 is an ICD-9-CM procedure code for open chest transmyocardial revascularization. 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 021K0Z5 (Bypass Right Ventricle to Coronary Circulation, Open Approach) and 021L0Z5 (Bypass Left Ventricle to Coronary Circulation, Open Approach). All of these are approximate matches, so review the record to pick the right one.
ICD-10-PCS equivalents
Common questions about 36.31
What is the ICD-10 code for ICD-9 36.31?
- The GEMs map 36.31 to ICD-10-PCS 021K0Z5 and 021L0Z5.
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.