T36.0X6Non-Billable (Header)Underdosing of penicillinsCode Hierarchy└T36Poisoning by, adverse effect of and underdosing of systemic antibiotics└T36.0Poisoning by, adverse effect of and underdosing of penicillins└T36.0XPoisoning by, adverse effect of and underdosing of penicillins└T36.0X6Underdosing of penicillins└T36.0X6Underdosing of penicillins