Toxic effect of methanol, undetermined, initial encounter

This code signifies the adverse health effects resulting from exposure to methanol, where the intent of the exposure (e.g., accidental, intentional self-harm, assault) cannot be determined. Patients may present with symptoms ranging from gastrointestinal upset, visual disturbances, and neurological impairment, to severe metabolic acidosis and organ damage.

Apply this code when a patient presents with signs and symptoms of methanol poisoning, and the medical record does not clearly specify whether the exposure was accidental, intentional, or due to assault. This is typically used for the initial encounter for care related to the toxic effect.

• Ensure documentation explicitly states "undetermined" intent for methanol exposure.
• Do not use this code if the intent (e.g., accidental, intentional self-harm) is clearly documented; instead, choose the appropriate intent-specific code.
• Remember the "A" seventh character indicates an initial encounter for active treatment of the poisoning.