2007 ICD-9-CM Procedure 37.91 Open chest cardiac massage 37.91 is a specific code that can be used to specify a procedure 37.91 contains 4 index entries View the full Volume 3 37.* hierarchy 37.91 excludes: closed chest cardiac massage (99.63) Index entries containing 37.91: Cardiac massage (external) (closed chest) 99.63 open chest 37.91 Massage cardiac (external) (manual) (closed) 99.63 open 37.91 Resuscitation cardiac 99.60 external massage 99.63 open chest 37.91 Stimulation (electronic) -- see also Implant, electronic stimulator cardiac (external) 99.62 internal 37.91