2007 ICD-9-CM Procedure 37.21 Right heart cardiac catheterization Procedure which includes placement of catheter, recording of intracardiac and intravascular pressure, obtaining blood samples for chemical analysis, and cardiac output measurement, etc. Specific angiographic injection techniques are also involved. 37.21 is a specific code that can be used to specify a procedure 37.21 contains 4 index entries View the full Volume 3 37.* hierarchy 37.21 also known as: Cardiac catheterization NOS 37.21 excludes: that with catheterization of left heart (37.23) Index entries containing 37.21: Catheterization -- see also Insertion, catheter cardiac (right) 37.21 combined left and right 37.23 left 37.22 combined with right heart 37.23 right 37.21 combined with left heart 37.23 heart (right) 37.21 combined left and right 37.23 left 37.22 combined with right heart 37.23 right 37.21 combined with left heart 37.23