Toxic effect of oth inorganic substances, undetermined, subs

This code signifies a harmful reaction to an unspecified inorganic substance, where the intent (accidental, intentional self-harm, assault) cannot be determined. It is used for encounters following the initial treatment of the toxic effect.

Apply this code when a patient presents for follow-up care, such as monitoring or further treatment, for a toxic exposure to an inorganic substance (e.g., certain heavy metals, non-medicinal chemicals) and the circumstances of the exposure remain unclear. This is appropriate for situations where the initial acute phase has passed.

• Ensure the encounter is for follow-up care, not the initial treatment.
• Confirm the substance is inorganic and not otherwise specified or classifiable.
• Verify that the intent of the exposure is truly undetermined in the medical record.