Postvaccination fever

This code signifies a fever that develops after the administration of a vaccine. It represents a systemic inflammatory response to the vaccine, typically a transient and self-limiting condition. This is a common and expected side effect of many immunizations.

Use this code when a patient presents with an elevated body temperature following a recent vaccination, and no other cause for the fever is identified. Documentation should clearly state the temporal relationship between the vaccination and the onset of fever, and rule out other infectious or inflammatory etiologies.

• Always sequence this code after the primary reason for the encounter, if applicable (e.g., for follow-up of vaccine side effects).
• Do not use this code if the fever is due to a concurrent infection or other unrelated medical condition.
• Consider additional codes for specific symptoms if documented (e.g., myalgia, headache) that are also attributed to the post-vaccination reaction.