Advrs effect of unsp agents aff the cardiovasc sys, sequela

This code signifies a long-term or residual health problem that developed as a result of an adverse reaction to an unidentifiable substance primarily impacting the heart and blood vessels. The initial adverse effect has resolved, but its lasting consequences on the cardiovascular system persist.

Apply this code when a patient presents with a chronic cardiovascular condition (e.g., persistent arrhythmia, cardiomyopathy) that is definitively linked to a past adverse drug reaction or exposure to an unknown chemical, and the acute phase of the reaction has passed. This code is appropriate when the specific agent causing the initial adverse effect cannot be determined.

• Always sequence this code after the code for the specific cardiovascular sequela.
• Ensure documentation clearly states the adverse effect is from an "unspecified agent" and that the condition is a "sequela."
• Do not use this code for acute adverse effects; use the appropriate acute adverse effect code with the 7th character "A" or "D."