Summary & Overview
HCPCS A4774: Ammonia Test Strips for Dialysis, Pack of 50
HCPCS Level II code A4774 identifies ammonia test strips packaged per 50 units intended for use in dialysis monitoring. These diagnostic supplies support clinical assessment of ammonia levels in patients undergoing hemodialysis or other renal replacement therapies. Nationally, supplies coded with A4774 are relevant to dialysis providers, supply chain managers, and payers that cover dialysis-related consumables.
Key payers included in this overview are Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find context on clinical application, typical sites of service (outpatient dialysis centers and hospital dialysis units), and the role of the supply in routine dialysis monitoring. The report also covers payment and billing considerations commonly associated with HCPCS Level II supply codes, common modifiers used with supply billing, and where to look for related codes and documentation requirements.
This summary provides a concise reference for billing staff, clinicians involved in dialysis care, and policy analysts seeking national-level understanding of the HCPCS Level II code A4774, its clinical purpose, and its use in dialysis settings. Data not available in the input is noted where relevant.
Billing Code Overview
HCPCS Level II code A4774 describes ammonia test strips, for dialysis, per 50. The code represents a supply item used to monitor ammonia levels in dialysis settings. The service type is a dialysis diagnostic supply used to support patient monitoring during renal replacement therapy. The typical site of service is dialysis facilities, including outpatient dialysis centers and hospital-based dialysis units.
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Clinical & Coding Specifications
Clinical Context
A dialysis clinic nurse prepares ammonia test strips A4774 (per 50) to monitor dialysate or patient specimens for elevated ammonia levels during routine hemodialysis or peritoneal dialysis care. A typical patient is an adult receiving chronic hemodialysis for end-stage renal disease who exhibits unexplained altered mental status, asterixis, or refractory metabolic encephalopathy. The workflow begins with clinician assessment prompting an ammonia check: the nurse collects a specimen (venous blood or dialysate sample depending on facility protocol), performs point-of-care ammonia strip testing or sends a batch to the dialysis unit laboratory, documents results in the patient chart, and communicates abnormal findings to the dialysis physician or on-call nephrologist for further diagnostic testing or treatment adjustments. Inventory management staff order A4774 in units of 50 strips for ongoing clinic supply, and billing staff submit the HCPCS Level II code for the purchased test strips used in the dialysis setting.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
00 | No modifier reported | Default when no modifier applies to the supply purchase |