Adverse effect of chloramphenicol group, sequela

This code signifies a long-term or residual condition resulting from a past adverse reaction to a medication belonging to the chloramphenicol group. These sequelae are persistent health problems that remain after the acute effects of the drug have resolved. Examples include chronic bone marrow suppression or permanent neurological damage.

Apply this code when documenting a patient presenting with a chronic condition directly attributable to a previous adverse effect of chloramphenicol, where the acute event is no longer active. This is used for conditions that are the lasting consequence of the drug reaction, not the acute reaction itself. It is appropriate for follow-up care related to such permanent damage.

• Always use this code as a secondary diagnosis, following the code for the specific sequela (e.g., aplastic anemia, optic neuropathy).
• Ensure documentation clearly links the current chronic condition to a past chloramphenicol adverse effect.
• Do not use for acute adverse reactions; those require codes from the T36-T50 range without the "S" seventh character.