Summary & Overview

CPT 83864: Quantitative 24-hour Urine Acid Mucopolysaccharides Test

Headline: CPT code 83864: Quantitative 24-hour Urine Acid Mucopolysaccharides Test. Lead: CPT code 83864 reports a laboratory measurement of acid mucopolysaccharides in a 24-hour urine collection, a diagnostic assay used to evaluate glycosaminoglycan excretion. The measure can inform evaluation of metabolic and storage disorders and supports clinical decision-making for specialty care.

CPT code 83864 represents a specialized laboratory diagnostic service that quantifies acid mucopolysaccharides in urine collected over 24 hours. The code matters nationally because it captures utilization of a targeted biochemical assay used in metabolic, genetic, and certain chronic disease workups. Its reporting affects laboratory billing, case mix, and clinical pathway documentation for conditions that prompt 24-hour urine testing.

Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of the clinical context for the test, typical sites of service, and the payers addressed. The publication outlines what readers can expect: national benchmarks for utilization and reimbursement patterns (where available), coding and billing considerations tied to the test description, and relevant policy or coverage update summaries that affect laboratory services nationally. Data not available in the input will be noted as such in specific tables or appendices.

AetnaBlue Cross Blue ShieldCigna HealthUnitedHealthcareMedicare83864CPTlaboratoryurine-testacid-mucopolysaccharides24-hour-urinediagnostic-testingclinical-laboratory

Billing Code Overview

CPT code 83864 describes a laboratory test in which the lab analyst measures the amount of acid mucopolysaccharides present in the urine collected over a 24-hour period. This test is a quantitative biochemical analysis used to evaluate levels of acid mucopolysaccharides (also called glycosaminoglycans) in urine.

Service type: Laboratory diagnostic test, quantitative urinalysis for acid mucopolysaccharides.

Typical site of service: Clinical laboratory or hospital laboratory where 24-hour urine collections are processed and analyzed.

Clinical & Coding Specifications

Clinical Context

A 45-year-old patient presents to a primary care clinic with progressive joint stiffness, chronic low back pain, and episodes of urinary discoloration. The clinician suspects a mucopolysaccharidosis-related accumulation or increased urinary glycosaminoglycans (acid mucopolysaccharides) secondary to metabolic disorder or a differential that includes connective tissue or storage disorders. The clinician orders a 24-hour urine collection for quantitative measurement of acid mucopolysaccharides to assess excretion levels.

The clinical workflow: the clinician provides verbal and written instructions and a 24-hour collection container. The patient collects all urine over a 24-hour period at home, refrigerates the specimen during collection per lab instructions, and returns it to the outpatient laboratory. A clinical laboratory scientist or medical technologist performs the quantitative assay to measure total acid mucopolysaccharides, documents results in the laboratory information system, and the ordering provider reviews results and documents interpretation in the medical record. Billing for the laboratory analytic service uses 83864 for the measurement performed on the 24-hour urine specimen.

Coding Specifications

Modifier	Description	When to Use
`26`	Professional component	Use when billing only for the professional component (interpretation) of the test if separated from the technical component.

Taxonomy Code	Specialty	Notes
`163W00000X`	Clinical Pathology	Clinical pathologists often oversee laboratory testing and interpretation.
`207L00000X`	Medical Laboratory Scientist	Medical laboratory scientists or technologists perform the assay and report results.
`207K00000X`	Clinical Laboratory Director	Directors manage quality and compliance for quantitative urine testing.
`208D00000X`	Family Medicine	Ordering providers frequently include primary care physicians who request metabolic urine testing.

CPT Code	Description	Relationship to This Procedure
`81000`	Urinalysis, by dipstick or tablet reagent; non-automated, without microscopy	Initial screening urinalysis often performed before or concurrent with 24-hour urine collection to evaluate baseline urine characteristics.
`81025`	Urine pregnancy test, by visual color comparison methods	Performed when pregnancy status affects interpretation of urine testing or specimen handling.
`81099`	Urinalysis, other; unlisted	Used when a nonstandard urinalysis-related service is performed in conjunction with specialized urine testing.
`83986`	Lipoprotein, direct measurement	Example of specialized quantitative urine/blood analyte testing performed in metabolic workups; shown here as a related specialized lab code.
`82570`	Creatinine; urine	Often performed on the same 24-hour urine specimen to normalize excretion rates (creatinine clearance or to verify completeness of collection).

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