T36.4X6Non-Billable (Header)Underdosing of tetracyclinesCode Hierarchy└T36Poisoning by, adverse effect of and underdosing of systemic antibiotics└T36.4Poisoning by, adverse effect of and underdosing of tetracyclines└T36.4XPoisoning by, adverse effect of and underdosing of tetracyclines└T36.4X6Underdosing of tetracyclines└T36.4X6Underdosing of tetracyclines