T48.1X1 - Poisoning by skeletal muscle relaxants [neuromuscular blocking agents], accidental (unintentional) T48.1 - Poisoning by, adverse effect of and underdosing of skeletal muscle relaxants [neuromuscular blocking agents] T48.1X - Poisoning by, adverse effect of and underdosing of skeletal muscle relaxants [neuromuscular blocking agents] T48.1X1 - Poisoning by skeletal muscle relaxants [neuromuscular blocking agents], accidental (unintentional)