HCPCS Level II code B4100 denotes a packaged supply: food thickener administered orally, billed per ounce. This code captures a common clinical supply used to modify liquid consistency for patients with dysphagia or other swallowing disorders. Nationally, use of packaged oral thickeners affects home health, long-term care, and outpatient nutrition management workflows and can influence supply line billing and coverage determinations.

Key payers evaluated in this context include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find an overview of coverage and billing considerations, common modifiers and claim attachments used with HCPCS Level II supplies, and typical sites of service where B4100 is applied. The publication summarizes national reimbursement context, coding practice considerations for supply-based oral nutrition interventions, and operational implications for supply ordering and documentation. Policy updates and payer-specific coverage criteria may affect prior authorization and medical necessity requirements; where payer-specific details are unavailable, the report notes limitations.

This summary is intended to provide clinicians, billing staff, and policy analysts with a concise understanding of what HCPCS Level II code B4100 represents, which payers commonly process these claims, and the practical contexts in which the code is used.