ICD-10 Code J39.3 – Upper respiratory tract hypersensitivity reaction, site unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code J39.3 – Upper respiratory tract hypersensitivity reaction, site unspecified
What it is
J39.3 identifies a hypersensitivity reaction affecting the upper respiratory tract when the exact site is not specified. Use it for documented allergic or irritant-type reactions in the nose, throat, or related upper airway structures.
Clinical signs
Clinical features vary; refer to documentation. Typical notes may describe upper airway irritation, swelling, or inflammatory symptoms consistent with a hypersensitivity reaction, without a more specific diagnosis.
When to use this code
Use J39.3 when the record clearly states an upper respiratory tract hypersensitivity reaction and the provider does not name a more specific site. It may also fit when the documentation supports an allergic-type upper airway reaction but is otherwise nonspecific. Check documentation if another diagnosis is recorded.
Do not use for
Do not use this code for lower respiratory conditions, infections, or allergic rhinitis with a more specific code. If the chart identifies a precise anatomic site or different cause, code that documented condition instead.
Coding tip
Before assigning J39.3, verify that “hypersensitivity reaction” is documented and that no more specific upper airway diagnosis is available.