Poisn by unsp agents aff the cardiovasc sys, undet, sequela

This code signifies a long-term or residual effect resulting from a poisoning event involving an unknown substance that primarily impacted the patient's heart and circulatory system. The original intent of the poisoning (e.g., accidental, intentional self-harm, assault) could not be determined.

Apply this code when documenting a chronic condition or lasting symptom directly attributable to a past poisoning by an unspecified cardiovascular agent, where the intent of the poisoning remains unknown. This is appropriate for follow-up encounters after the acute phase of the poisoning has resolved.

• Always use this code as a secondary diagnosis, following the code for the specific sequela (e.g., chronic arrhythmia, cardiomyopathy).
• Ensure documentation clearly links the current cardiovascular condition to a past, undetermined poisoning event.
• Avoid using this code for acute poisoning events; it is specifically for sequelae.