Adverse effect of smallpox vaccines, initial encounter

This code signifies an undesirable or harmful reaction experienced by a patient due to the administration of a smallpox vaccine. These reactions are not due to an error in administration but rather an inherent physiological response to the vaccine itself.

Apply this code when a patient presents for initial treatment of symptoms directly attributable to an adverse effect of a smallpox vaccine. This includes conditions like severe local reactions, systemic symptoms, or other complications arising from the vaccine.

• Always assign an additional code for the specific manifestation of the adverse effect (e.g., rash, fever).
• Ensure the encounter is the initial one for the management of the adverse effect.
• Distinguish from poisoning or underdosing; this code is for proper administration with an adverse outcome.