Anaphylactic reaction due to vaccination, sequela

This code signifies a long-term or residual effect stemming from a severe, life-threatening allergic reaction (anaphylaxis) that occurred after a vaccination. It indicates that the patient is experiencing ongoing health issues directly attributable to the past anaphylactic event, rather than the acute reaction itself.

Use this code when documenting a patient presenting with a chronic condition or persistent symptom that is a direct consequence of an anaphylactic reaction to a vaccine, even if the original acute event occurred in the distant past. This applies when the sequela is the primary reason for the current encounter.

• Always use in conjunction with a code describing the specific sequela (e.g., neurological deficit, chronic respiratory issue).
• Ensure documentation clearly links the current condition to a past anaphylactic reaction from a vaccine.
• Do not use for the acute anaphylactic reaction itself; refer to codes in the T80.51- category for acute events.