Adverse effect of unspecified systemic antibiotic, sequela

This code signifies a lasting or residual health problem resulting from an adverse reaction to a systemic antibiotic, where the specific antibiotic agent is not documented. The patient experienced an undesirable effect from the medication, and the current condition is a long-term consequence of that initial reaction.

Apply this code when a patient presents with a chronic or persistent condition directly attributable to an adverse effect of a systemic antibiotic, and the medical record does not specify which antibiotic caused the reaction. This is appropriate for follow-up encounters where the acute adverse effect has resolved, but a sequela remains.

• Always sequence this code after the code(s) for the specific sequela being treated.
• Only use this code when the specific antibiotic is unknown; otherwise, use a more specific T36.x5- code.
• The "S" seventh character indicates a sequela, meaning the residual effect of a past adverse event.