Toxic effect of mercury and its compounds, undet, subs

This code signifies the adverse health effects resulting from exposure to mercury or its compounds, where the intent of the exposure (e.g., accidental, intentional self-harm, assault) cannot be determined. These effects can range from neurological symptoms to kidney damage, depending on the type, amount, and duration of exposure.

Apply this code for follow-up care of a patient previously diagnosed with mercury poisoning when the circumstances of the exposure remain unknown. This includes subsequent visits for monitoring symptoms, managing ongoing complications, or evaluating the effectiveness of treatment.

• Ensure documentation clearly states "undetermined" intent for the mercury exposure.
• Pair with codes for specific manifestations of mercury toxicity (e.g., neurological, renal).
• Use the appropriate 7th character for the encounter type (A for initial, D for subsequent, S for sequela).