Toxic effect of benzene and homologues

This code signifies the adverse health effects resulting from exposure to benzene or its chemical relatives (homologues) such as toluene or xylene. These toxic effects can manifest as acute or chronic poisoning, affecting various organ systems, particularly the hematopoietic system. The severity of the toxic effect depends on the duration and level of exposure.

Use this code when documentation clearly indicates a patient's illness or injury is directly attributable to exposure to benzene or its homologues. This includes accidental ingestion, inhalation, or dermal absorption leading to symptoms like dizziness, headache, nausea, or more severe conditions like aplastic anemia or leukemia. Supporting documentation should specify the substance involved and the resulting toxic effect.

• Always sequence this code as a primary diagnosis when it is the reason for the encounter.
• Ensure documentation differentiates between accidental poisoning, intentional self-harm, or assault, as these scenarios require additional external cause codes.
• Do not use for allergic reactions or adverse effects from therapeutic use of these substances; those have different code categories.