Toxic effect of unspecified substance, chiefly nonmedicinal as to source

This code signifies an adverse health effect resulting from exposure to a toxic substance where the specific agent is unknown, and the source is primarily non-medicinal. It indicates a poisoning or toxic reaction without identifying the causative chemical or compound.

Apply this code when a patient presents with symptoms of poisoning or a toxic reaction, and the medical record clearly states that the specific toxic agent cannot be identified. This is appropriate when the exposure is known to be from a non-drug source, such as environmental toxins, industrial chemicals, or unknown ingested substances.

• Do not use this code if the specific toxic substance is known; instead, code to the specific substance.
• Ensure documentation explicitly states "unspecified substance" or "unknown toxic agent" and a non-medicinal source.
• Consider an external cause code (E-code) to further describe the circumstances of the exposure, if known.