Toxic effect of mercury and its compounds, undet, sequela

This code signifies a long-term or residual health problem resulting from a past exposure to mercury or its compounds, where the intent of the exposure (e.g., accidental, intentional self-harm) could not be determined. These sequelae can manifest as neurological deficits, kidney damage, or other chronic conditions that persist after the acute toxic event has resolved.

This code is appropriate for documenting chronic conditions directly attributable to a previous mercury poisoning, when the original incident's intent is unknown. It should be used when the patient is presenting for treatment of these lasting effects, rather than the acute toxic event itself.

• Always sequence this code after the code(s) for the specific sequela being treated (e.g., chronic kidney disease, peripheral neuropathy).
• Ensure documentation clearly links the current condition to a past mercury exposure and states the undetermined intent.
• Do not use this code for acute mercury poisoning or for exposures where the intent is known (e.g., accidental, assault).