Toxic effect of benzene, undetermined, subsequent encounter

This code signifies a toxic reaction to benzene where the intent of exposure (e.g., accidental, intentional self-harm, assault) cannot be determined. The patient is in the recovery phase of treatment for the benzene poisoning, receiving follow-up care after the initial acute phase.

Apply this code for patients presenting for ongoing management of benzene toxicity, such as monitoring for long-term effects, after the initial treatment for acute poisoning has concluded. This is appropriate when documentation clearly states "undetermined" intent of exposure and the encounter is not for the initial acute treatment.

• Requires documentation of "undetermined" intent for benzene exposure.
• The 7th character "D" indicates a subsequent encounter, meaning the patient is receiving routine care during the healing or recovery phase.
• Always sequence this code after any codes for specific manifestations of the benzene toxicity.