Upper respiratory tract hypersensitivity reaction, site unspecified

This code signifies an allergic or hypersensitivity response affecting the upper respiratory system, such as the nose, pharynx, or larynx, where the specific anatomical site of the reaction is not documented. It indicates an immune-mediated reaction to an allergen, manifesting with symptoms like sneezing, rhinorrhea, nasal congestion, or throat irritation.

Use this code when documentation clearly indicates an allergic reaction involving the upper respiratory tract, but the physician has not specified a more precise location (e.g., allergic rhinitis, allergic pharyngitis). This code is appropriate when the clinical picture points to an allergic etiology but lacks the specificity for a more detailed diagnosis.

• Avoid using this code if a more specific diagnosis, such as allergic rhinitis (477.x), is documented.
• Always review the medical record for any mention of the specific allergen to allow for additional coding if applicable.
• Consider sequencing this code after codes for the specific allergen exposure if known and documented.