2007 ICD-9-CM Procedure 37.53 Replacement or repair of thoracic unit of total replacement heart system 37.53 is a specific code that can be used to specify a procedure 37.53 contains 3 index entries View the full Volume 3 37.* hierarchy 37.53 excludes: replacement and repair of heart assist system [VAD](37.63) Index entries containing 37.53: Repair heart 37.49 total replacement system 37.52 thoracic unit 37.53 Replacement heart artificial total replacement system 37.52 thoracic unit 37.53 thoracic unit 37.53