Allergy, unspecified, initial encounter

This code signifies an allergic reaction where the specific allergen or the precise nature of the allergic response is not documented. It indicates that the patient is experiencing symptoms consistent with an allergy, but further investigation is needed to identify the causative agent or the exact type of hypersensitivity.

Use this code when a patient presents with signs and symptoms of an allergy (e.g., rash, itching, swelling, respiratory distress) but the provider has not yet identified the specific allergen or the type of allergic reaction. This is appropriate for initial evaluations before a definitive diagnosis of the allergen is established.

• Only use this code when the specific allergen is truly unknown or unspecified in the medical record.
• Avoid using this code if a more specific allergy code (e.g., food allergy, drug allergy) can be assigned based on documentation.
• Always look for opportunities to query the provider for more specific information to allow for more precise coding.