Surgery and invasive operation grading surgery refers to all kinds of open surgery, lumpectomy and anesthesia methods (hereinafter collectively referred to as surgery). Based on their technical difficulty, complexity and risk level, surgeries are classified into four levels.
Level I surgery: various surgeries with low technical difficulty, simple surgical procedures and low risk.
Level II surgery: average technical difficulty and surgical procedures.
Level III surgery: various surgeries with greater technical difficulty, more complex surgical procedures and greater risk.
Level IV surgery: various surgeries with high technical difficulty, complex surgical procedures, and high degree of risk.
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