C4A: Merkel cell carcinoma
C4A.7: Merkel cell carcinoma of lower limb, including hip
C4A.70: Merkel cell carcinoma of unspecified lower limb, including hip
C4A.71: Merkel cell carcinoma of right lower limb, including hip
C4A.72: Merkel cell carcinoma of left lower limb, including hip

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