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 E04 Surgical Procedures, Operative D013514 +
  E04.100 Cardiovascular Surgical Procedures D013504 +
   E04.100.376 Cardiac Surgical Procedures D006348 +
    E04.100.376.719 Myocardial Revascularization D009204 +
     E04.100.376.719.332 Coronary Artery Bypass D001026 +
       E04.100.376.719.332.400 Internal Mammary-Coronary Artery Anastomosis D007387 

 E04 Surgical Procedures, Operative D013514 +
  E04.928 Thoracic Surgical Procedures D019616 +
   E04.928.220 Cardiac Surgical Procedures D006348 +
    E04.928.220.520 Myocardial Revascularization D009204 +
     E04.928.220.520.220 Coronary Artery Bypass D001026 +
       E04.928.220.520.220.380 Internal Mammary-Coronary Artery Anastomosis D007387