Poisoning by local anesthetics, undetermined, sequela

This code signifies a long-term or residual effect resulting from a poisoning event involving local anesthetics, where the intent of the poisoning (accidental, intentional self-harm, assault) cannot be determined. It is used when the acute phase of the poisoning has passed, and the patient is now presenting with ongoing health issues directly attributable to the past exposure.

Apply this code when documenting a patient presenting with a chronic condition, such as persistent neurological deficits, organ damage, or other lasting complications, that are definitively linked to a prior, unclassified local anesthetic poisoning. This is appropriate for follow-up encounters after the initial poisoning event has been resolved and the patient is being treated for the sequelae.

• Always assign this code as a secondary diagnosis, following the code for the specific sequela (e.g., G93.40 for encephalopathy).
• Ensure documentation clearly links the current condition to the past local anesthetic poisoning and specifies the undetermined intent.
• Do not use this code for acute poisoning events; instead, refer to the appropriate acute poisoning codes with the 7th character for initial, subsequent, or sequela encounter.