Other serum reaction due to vaccination, sequela

This code signifies a delayed or persistent adverse reaction to a vaccination that manifests as a serum-like illness, but is not specifically classified as serum sickness. These reactions are typically immune-mediated and can present with symptoms such as rash, fever, arthralgia, or lymphadenopathy, occurring days to weeks after vaccine administration.

Use this code when documenting a patient presenting with a chronic or late-onset serum-like reaction directly attributable to a previous vaccination. This applies to situations where the acute phase of the reaction has passed, but the patient continues to experience related symptoms or complications. It is appropriate for reactions that do not meet the criteria for classic serum sickness.

• Always assign an additional code to identify the specific vaccine causing the reaction.
• Ensure documentation clearly links the persistent symptoms to the vaccination event.
• This "S" (sequela) encounter code is used for complications or conditions that arise as a direct result of an earlier injury or disease, in this case, the vaccination reaction.