Anaphylactic reaction due to other serum, sequela

This code describes a delayed or chronic health problem resulting from a past anaphylactic reaction caused by a serum product other than antitetanus serum. It indicates that the acute anaphylactic episode has resolved, but the patient is still experiencing persistent effects attributable to that severe allergic response.

Use this code when documenting a patient presenting with a long-term complication or sequela directly linked to a prior anaphylactic reaction from a non-tetanus serum. This applies to conditions like chronic urticaria, angioedema, or organ damage that developed as a consequence of the initial severe allergic event.

• Always assign an additional code to specify the exact nature of the sequela (e.g., chronic urticaria, renal failure).
• Ensure documentation clearly links the current condition to a past anaphylactic reaction from a "different" serum.
• Do not use for acute anaphylactic reactions; this code is exclusively for the residual effects.