Toxic effect of oth substances, undetermined, sequela

This code signifies a long-term or residual health problem resulting from exposure to a toxic substance not otherwise specified, where the intent of the exposure (accidental, intentional self-harm, assault) cannot be determined. These are conditions that persist after the acute phase of the poisoning has resolved.

Use this code when documenting chronic neurological deficits, organ damage, or other lasting health issues clearly linked to a past toxic exposure to a substance that doesn't have a more specific ICD-10-CM code, and the circumstances of the original exposure are unknown. Examples include persistent kidney failure years after an unclarified chemical exposure, or chronic peripheral neuropathy following an unknown toxin ingestion.

• Always ensure documentation explicitly links the current sequela to a past toxic exposure.
• Confirm the intent of the original exposure is truly "undetermined" before assigning this code; if known, a different intent character (A, D, P) would be used.
• Code the specific manifestation of the sequela first, followed by this code to indicate the cause.