Anaphyl reaction due to advrs eff drug/med prop admin, subs

This code signifies a severe, life-threatening allergic reaction (anaphylaxis) that occurred as an unintended consequence of a correctly prescribed and administered medication. The reaction is an adverse effect, not a poisoning or overdose, and the patient is presenting for follow-up care or management of residual effects.

Apply this code when a patient returns for subsequent treatment or monitoring related to an anaphylactic episode caused by a drug given appropriately. Examples include follow-up after an emergency room visit for drug-induced anaphylaxis, or management of lingering symptoms such as rash or respiratory issues. This code is used after the initial acute phase of treatment.

• Always sequence this code after the primary diagnosis for the condition being treated, if applicable.
• Requires an additional code to identify the specific drug that caused the anaphylactic reaction (e.g., from T36-T50 with a 5th or 6th character of 5 or 6).
• The 7th character "D" indicates a subsequent encounter, meaning the patient is receiving routine care during the healing or recovery phase.