CPT code 95120 represents a single allergen immunotherapy injection administered as part of a graduated series of shots intended to induce tolerance to specific allergens. This code captures the administration event when a provider gives one injection during a dosing session rather than multiple concurrent injections. Nationally, allergen immunotherapy is a common treatment for allergic rhinitis, allergic conjunctivitis, and some cases of allergic asthma, making accurate billing for individual injections important for clinical documentation and payment consistency.

Key payers discussed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find an overview of coding context, expected sites of service, and common clinical scenarios in which 95120 is used. The publication outlines typical payer considerations and common modifiers reported in practice. It also summarizes benchmarking points and recent policy clarifications where available. This resource is intended to help billing managers, revenue cycle staff, and clinicians understand when to use CPT code 95120, what settings typically report it, and what topics to review in payer policies and internal billing protocols. Data not available in the input is noted where applicable.