Generalized vaccinia as a complication of medical care, not elsewhere classified

This code describes a widespread infection with the vaccinia virus that occurs as an adverse effect of medical intervention, rather than a natural infection. It signifies a systemic reaction to vaccinia vaccination or exposure, manifesting beyond the typical localized lesion. This condition is a complication of a medical procedure or treatment.

Use this code when a patient develops generalized vaccinia, meaning the vaccinia lesions spread extensively beyond the primary vaccination site, and this reaction is directly attributable to a medical procedure, such as smallpox vaccination. Documentation should clearly state the diagnosis of generalized vaccinia and its iatrogenic origin.

• Always sequence this code as a secondary diagnosis, following the code for the underlying condition or reason for the medical care that led to the complication.
• Ensure documentation specifies "generalized" vaccinia; localized reactions would not typically warrant this code.
• Distinguish from accidental vaccinia inoculation (e.g., self-inoculation), which would be coded differently as it's not a complication of medical care.