Summary & Overview
CPT 84392: Quantitative Urine Sulfate Test, 24-Hour Specimen
CPT code 84392 represents a quantitative laboratory assay to measure sulfate in urine, typically performed on a 24-hour urine specimen. This specialized biochemical test supports evaluation of metabolic, renal and nutritional conditions where sulfate excretion is clinically relevant. Nationally, this code matters for laboratory billing, clinical interpretation workflows, and payer coverage determinations for specialized urine testing.
Key payers in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare and Medicare. Readers will find a concise overview of clinical context for ordering the test, common sites of service, and operational considerations for laboratories. The publication summarizes benchmark payment perspectives, common modifier usage (listed separately), and coding guidance where available. It also outlines what typical documentation and specimen requirements support medical necessity determinations for sulfate urine testing.
This national summary is aimed at billing specialists, clinical laboratorians, and revenue cycle professionals seeking a focused reference on coding, clinical role, and payer relevance for CPT code 84392. Data not available in the input is noted where applicable in detailed sections.
Billing Code Overview
CPT code 84392 describes a laboratory analysis measuring sulfate in a patient urine specimen, most commonly performed on a 24-hour urine collection. The test quantifies urinary sulfate levels to aid clinical assessment of metabolic and renal processes.
Service type: Clinical laboratory test — quantitative urine assay
Typical site of service: Clinical laboratory or hospital laboratory, with specimen collection occurring in outpatient settings or via home collection for timed (24-hour) urine specimens.
Clinical & Coding Specifications
Clinical Context
A typical scenario involves an adult patient referred by a primary care provider or nephrologist for quantitative measurement of urinary sulfate to evaluate sulfur amino acid metabolism, suspected metabolic disorders, renal tubular dysfunction, or to monitor occupational or environmental exposure to sulfate-containing compounds. The specimen is usually collected as a 24-hour urine sample with clear patient instructions regarding collection, storage, and avoidance of contaminating substances. The clinical workflow includes order entry by the provider, patient education and collection kit distribution at the clinic or laboratory, return of the 24-hour urinespecimen to the outpatient laboratory or hospital laboratory, accessioning by the lab, aliquoting and preparation by a medical technologist, performance of theurine sulfate` assay by a laboratory analyst, result validation by a qualified laboratorian or pathologist if necessary, and electronic reporting to the ordering provider. Typical sites of service are outpatient laboratory collection centers, hospital laboratories, or specialty metabolic clinics. Common clinical indications include investigation of abnormal amino acid or sulfur metabolite profiles, unexplained metabolic acidosis or renal tubular disorders, monitoring of occupational exposure, and follow-up of known metabolic conditions affecting sulfate excretion.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|