Adverse effect of vaccines and biolg substances, sequela

This code signifies a long-term or residual condition resulting from a past adverse reaction to a vaccine or other biological substance. It indicates that the initial acute adverse effect has resolved, but a lasting health problem remains directly attributable to that event.

Use this code when documenting a chronic or permanent sequela (e.g., persistent neurological damage, chronic pain, or organ dysfunction) that developed as a direct consequence of an adverse reaction to a vaccine or biological substance administered in the past. This applies when the acute adverse effect is no longer present, but its lingering impact requires ongoing medical attention.

• Always sequence this code after the code(s) for the specific sequela being treated.
• Ensure documentation clearly links the current condition to a prior adverse effect of a vaccine or biological substance.
• Do not use this code for acute adverse reactions; use the appropriate acute adverse effect code for those scenarios.