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CPT 95165: Antigen Preparation for Allergen Immunotherapy
CPT code 95165 denotes the professional service of mixing and preparing antigens used in allergen immunotherapy. This code captures the clinical task of compounding one or more allergenic extracts prior to administration and is relevant across outpatient allergy and immunology practices. Accurate use of 95165 supports clear clinical documentation and appropriate billing for the preparatory work that precedes immunotherapy injections, and it is widely recognized in national payer policies governing allergy services.
Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, United Healthcare, and Medicare. Readers will find a concise overview of the code’s clinical context, common billing relationships with related allergen immunotherapy codes, and the typical sites where the service is performed. The publication outlines common modifiers associated with procedural billing and lists diagnostic codes frequently paired with this service for chronic allergic eye conditions.
The report is intended for clinicians, coding and billing staff, and revenue cycle managers seeking a clear reference for documentation expectations, claims submission, and alignment with payer coverage pathways. It highlights operational considerations tied to antigen preparation and situates 95165 within the broader set of allergen immunotherapy codes used for professional services and antigen provision.
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Billing Code Overview
CPT code 95165 describes the mixing and preparation of antigens for allergen immunotherapy. This procedure is reported when a provider prepares one or more allergenic extracts for patient-specific immunotherapy.
Service type: Allergen immunotherapy antigen preparation
Typical site of service: Allergy clinic or physician office where allergen extracts are compounded and prepared for administration
National Reimbursement Benchmarks
Medicare mean reimbursement for CPT 95165 is $18.10, while BUCA (average commercial) reports a substantially higher mean of $72.00, indicating commercial average rates are roughly four times the Medicare average for this code. Other commercial payers’ means fall between those points: Aetna $231.20 (note Aetna’s mean is elevated by a large max), Blue Cross Blue Shield $61.10, Cigna $12.50, and UnitedHealth Group $15.80.
Rate dispersion varies notably across payers. Compute P75–P25 ranges where available: Aetna range = 337.5 - 7.7 = 329.8 (widest), Blue Cross Blue Shield range = 76.0 - 50.4 = 25.6, BUCA range = 97.4 - 31.6 = 65.8, Cigna range = 18.9 - 4.5 = 14.4 (tightest among those with quartiles), UnitedHealth Group range = 21.7 - 7.6 = 14.1 (also very tight). Medicare quartiles are clustered (P25 17, P75 19) indicating a tight distribution around the mean. These ranges highlight Aetna’s extensive spread and Cigna and UnitedHealth Group’s relatively narrow interquartile ranges.
The table and chart below present the full breakdown of percentiles, means, medians, and extreme values for each payer listed: Aetna, Blue Cross Blue Shield, Cigna, UnitedHealth Group, BUCA, and Medicare.