Poisoning by unspecified agent affecting blood constituents

This code signifies an adverse reaction or toxic effect on the blood components due to an unknown or unspecified substance. It indicates a poisoning event where the specific agent causing the hematologic compromise cannot be identified.

Use this code when a patient presents with symptoms of poisoning, and laboratory findings confirm an impact on blood constituents (e.g., anemia, coagulopathy, methemoglobinemia) but the causative toxic agent remains undetermined despite investigation. Documentation should clearly state "poisoning by unspecified agent affecting blood" or similar.

• Only use when the specific toxic agent cannot be identified; otherwise, code to the specific substance.
• Always sequence this code after the primary diagnosis indicating the specific hematologic manifestation (e.g., aplastic anemia, methemoglobinemia).
• Avoid using if the poisoning is due to a therapeutic drug taken correctly, which would be an adverse effect.