HCPCS Level II code B4154 represents a nutritionally complete enteral formula formulated for special metabolic needs (excluding inherited metabolic diseases) and billed by calorie (100 calories = 1 unit). This code matters nationally because specialized enteral formulas are critical for patients who require tube feeding with tailored macronutrient or micronutrient profiles to manage metabolic conditions, and they drive durable medical supply and nutrition-authority coverage decisions across payers. Key payers in the national landscape include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare.

Readers will learn what B4154 covers clinically and operationally, which sites of service typically use this product, and how unitization by calories affects claim lines. The publication outlines payer coverage patterns and benchmarks where available, common billing practices and modifiers used with enteral nutrition claims, and the clinical context that justifies use of specialized metabolic formulas. It will also summarize relevant coding relationships and common documentation elements required for medical necessity review. Data not available in the input is noted where applicable.