Tox eff of nitro & oth nitric acids and esters, undet, init

This code signifies an adverse reaction to nitroglycerin or other nitric acid derivatives where the intent (e.g., accidental, intentional self-harm) cannot be determined. It specifically points to the initial presentation of symptoms related to the toxic effect of these substances.

Apply this code when a patient presents with signs and symptoms of nitroglycerin toxicity, such as severe hypotension, headache, or methemoglobinemia, and the provider's documentation does not specify whether the exposure was accidental, intentional, or therapeutic misadventure. This is appropriate for the very first encounter for this specific poisoning event.

• Ensure documentation clearly states "undetermined" intent for the toxic effect.
• Always sequence this code first if it is the primary reason for the encounter.
• Do not use this code if the intent (e.g., accidental, intentional self-harm) is known or if it's a subsequent encounter for the same event.