Toxic effect of unsp inorganic substance, undet, sequela

This code signifies a long-term health problem resulting from exposure to an unknown inorganic toxic substance, where the intent of the exposure (e.g., accidental, intentional) cannot be determined. It is used when the acute phase of the poisoning has passed, and the patient is experiencing residual effects.

Use this code for patients presenting with chronic or residual symptoms (e.g., organ damage, neurological deficits) clearly linked to a past exposure to an unspecified inorganic toxin. This applies when the original exposure event is in the past, and the specific substance or intent of exposure remains unknown.

• Always sequence this code after the code(s) for the specific sequelae or chronic conditions being treated.
• Ensure documentation clearly links the current condition to a past, undetermined inorganic toxic exposure.
• Avoid using this code for acute poisoning; instead, use the appropriate acute poisoning code with the 7th character "A" or "D."