Allergy, unspecified, not elsewhere classified

This code represents a general allergic reaction where the specific allergen or type of allergy is not identified. It signifies a patient experiencing symptoms consistent with an allergy, but without a definitive diagnosis of the causative agent or a more precise allergic condition.

Use this code when the medical record documents an "allergy," "allergic reaction," or "hypersensitivity reaction" without further specification of the allergen (e.g., food, drug, environmental). This code is appropriate when the provider has not yet determined the specific type of allergy or when the documentation is insufficient to assign a more specific allergy code.

• Avoid using this code if a more specific allergy diagnosis (e.g., food allergy, drug allergy) is documented.
• Always query the provider for clarification if the documentation suggests a specific allergen but doesn't explicitly state it.
• This code should generally be a last resort for allergy coding when no other specific option is available.