Anaphylactic reaction due to admin blood/products, sequela

This code describes the long-term or residual effects resulting from a severe, life-threatening allergic reaction (anaphylaxis) that occurred due to the transfusion of blood or blood products. These sequelae can include persistent organ damage, chronic respiratory issues, or neurological deficits that developed as a direct consequence of the anaphylactic episode.

Use this code when documenting a patient's current condition that is a direct, lasting complication of a past anaphylactic reaction triggered by a blood transfusion. This applies to situations where the acute event has resolved, but the patient continues to experience related health problems. It should be assigned for follow-up care or management of these chronic sequelae.

• Requires a seventh character 'S' to indicate sequela, meaning the residual effect of a previous injury or illness.
• Do not use for the acute anaphylactic reaction itself; this code is only for the lasting complications.
• Always code the specific sequela (e.g., chronic asthma, kidney damage) first, followed by this code to indicate the cause.