Summary & Overview
HCPCS B4189: Parenteral Nutrition Premix, 10–51 g Protein
HCPCS Level II code B4189 represents a compounded premixed parenteral nutrition solution containing amino acids and carbohydrates with electrolytes, trace elements, and vitamins, formulated to provide 10 to 51 grams of protein. This code captures the preparation and supply of premixed nutrition used in settings where intravenous nutrition support is required, including hospital inpatient and outpatient infusion centers, skilled nursing facilities, long-term acute care, and home infusion therapy. Nationally, parenteral nutrition codes like B4189 are significant because they affect hospital and post-acute nutrition support billing, supply chain management for compounded solutions, and coverage policies for complex nutritional therapy.
Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise summary of the clinical context for parenteral premix solutions, common sites of service, typical billing considerations, and the types of benchmarks and policy guidance generally associated with this service line. The publication outlines expected use cases for a 10–51 gram protein premix, how payers commonly approach coverage for compounded parenteral nutrition, and where stakeholders can expect to find policy updates or utilization benchmarks. Data not available in the input will be noted where applicable.
Billing Code Overview
HCPCS Level II code B4189 describes a parenteral nutrition solution: compounded amino acid and carbohydrates with electrolytes, trace elements, and vitamins, including preparation, any strength, 10 to 51 grams of protein - premix. The service is the provision and preparation of a premixed parenteral nutrition formulation designed to deliver amino acids (protein equivalent of 10–51 grams), carbohydrates, electrolytes, trace elements, and vitamins.
Service type: Compound parenteral nutrition solution preparation and supply.
Typical site of service: Hospital inpatient, hospital outpatient infusion center, long-term acute care facility, skilled nursing facility, or home infusion therapy settings where premixed parenteral nutrition is administered.
Clinical & Coding Specifications
Clinical Context
A typical patient is an adult with inadequate oral or enteral nutrition who requires inpatient or outpatient parenteral nutrition (PN) support. Example scenario: a 58-year-old postoperative patient after major bowel resection with prolonged ileus and high-output fistula, unable to tolerate enteral feeds for >7 days. The patient is evaluated by the surgical and nutrition support teams, orders for a compounded premixed parenteral nutrition solution are placed by the prescribing physician, and pharmacy compounds the PN bag labeled as B4189 containing amino acids (10–51 g protein equivalent), dextrose, electrolytes, trace elements, and vitamins. Typical workflow steps: initial nutrition assessment and laboratory evaluation (electrolytes, liver function, glucose, magnesium, phosphate), prescription of PN formulation and daily monitoring plan, sterile compounding in pharmacy under USP <797> conditions, nursing administration via central or peripheral intravenous access, daily multidisciplinary review and adjustment, and documentation of intake/output, complications, and clinical response.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
00 | No modifier | Use when no special modifier applies to the service. |