Allergic or hypersensitivity conditions

Definition

Allergy is a hypersensitivity reaction initiated by proven immunologic mechanisms. Hypersensitivity is defined as conditions clinically resembling allergy that cause objectively reproducible symptoms or signs, initiated by exposure to a defined stimulus at a dose tolerated by normal subjects.

8 subordinate codes

• 4A80Allergic or hypersensitivity disorders involving the respiratory tract
• 4A81Allergic or hypersensitivity disorders involving the eye
• 4A82Allergic or hypersensitivity disorders involving skin or mucous membranes
• 4A83Allergic or hypersensitivity disorders involving the gastrointestinal tract
• 4A84Anaphylaxis
• 4A85Complex allergic or hypersensitivity conditions
• 4B4YOther specified diseases of the immune system
• 4B4ZDiseases of the immune system, unspecified

Nearby in Diseases of the immune system

• 4A00-4A0ZPrimary immunodeficiencies
• 4A20Acquired immunodeficiencies
• 4A40-4A4ZNonorgan specific systemic autoimmune disorders
• 4A60-4A6ZAutoinflammatory disorders
• 4B00-4B0ZImmune system disorders involving white cell lineages
• 4B20-4B2YCertain disorders involving the immune system
• 4B40Diseases of thymus
• Organ specific autoimmune disorders