Poisoning by, adverse effect of and underdosing of systemic antibiotics Excludes1antineoplastic antibiotics (T45.1-)locally applied antibiotic NEC (T49.0)topically used antibiotic for ear, nose and throat (T49.6)topically used antibiotic for eye (T49.5)The appropriate 7th character is to be added to each code from category T36A - initial encounterD - subsequent encounterS - sequela