Adverse effect of smallpox vaccines, subsequent encounter

This code signifies a patient experiencing an unintended and undesirable reaction to a smallpox vaccine, specifically when the patient is presenting for follow-up care related to that adverse effect. It indicates that the initial event has already occurred, and the patient is now seeking further medical attention for the ongoing or residual effects of the vaccine reaction.

This code is appropriate for encounters where a patient is being treated for complications or persistent symptoms arising from a smallpox vaccination, and this is not their initial presentation for the adverse effect. Examples include follow-up visits for chronic skin lesions, neurological sequelae, or other ongoing health issues directly attributable to a smallpox vaccine.

• Always sequence this code after the code(s) for the specific manifestation(s) of the adverse effect.
• Ensure documentation clearly states the adverse effect is related to a smallpox vaccine and that this is a subsequent encounter.
• Do not use this code for initial presentations of an adverse effect; refer to codes for initial encounters.