Poisoning by chloramphenicol group, self-harm, sequela

This code signifies a long-term or residual condition resulting from a previous act of intentional self-poisoning with a chloramphenicol-based medication. The initial acute poisoning event has resolved, but the patient continues to experience health problems directly attributable to that self-harm.

This code is appropriate when a patient presents with a chronic or permanent sequela (e.g., bone marrow suppression, optic neuritis, or other organ damage) that is documented as a direct consequence of a past intentional overdose of a chloramphenicol-group antibiotic. It should be used after the acute phase of the poisoning has passed and the patient is being treated for the ongoing effects.

• Always assign this code as a secondary diagnosis, following the code for the specific sequela (e.g., aplastic anemia).
• Ensure documentation clearly links the current condition to a past intentional chloramphenicol poisoning.
• Do not use this code for acute poisoning events; use the appropriate acute poisoning code with the 7th character "A" for initial encounter.