Free Medical Coding > ICD10 CM > 2024 ICD-10-CM Codes > 2024 ICD-10-CM Codes S00-T88 – Injury, poisoning and certain other consequences of external causes (S00-T88) > 2024 ICD-10-CM Codes T66-T78 – Other and unspecified effects of external causes (T66-T78) > 2024 ICD-10-CM Codes T78 – Adverse effects, not elsewhere classified (T78) > 2024 ICD-10-CM Codes T78.4 – Other and unspecified allergy (T78.4) > 2024 ICD-10-CM Codes T78.41 – Arthus phenomenon (T78.41)