T48.1X6 - Underdosing of skeletal muscle relaxants [neuromuscular blocking agents] 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] T48.1X6 - Underdosing of skeletal muscle relaxants [neuromuscular blocking agents]