CPT 84578: Urobilinogen Test in Urine

CPT code 84578 represents a laboratory test for the detection of urobilinogen in urine, a common component of urinalysis used to assess bilirubin metabolism and liver function. Nationally, this code is used across outpatient and inpatient laboratory settings to support diagnostic evaluation of hepatic and hemolytic processes. Accurate coding for 84578 matters for clinical documentation, laboratory workflow, and payer adjudication.

Key payers frequently involved with this service include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of clinical context for urobilinogen testing, standard sites of service, and the typical service type. The publication provides benchmarks and payment context where available, outlines common billing modifiers and coding considerations, and summarizes relevant policy updates that affect laboratory reimbursement and coverage for urinalysis components. Clinical implications and typical use cases for 84578 are covered to help billing, coding, and laboratory operations teams understand how the test fits into diagnostic workups.

Data not available in the input for associated taxonomies, ICD-10 mappings, and related codes is noted where applicable in detailed sections.

Billing Code Overview

CPT code 84578 describes a laboratory assay performed by a lab analyst to determine the presence of urobilinogen in urine. The test identifies and reports the level of urobilinogen, a byproduct of bilirubin metabolism, as part of urinalysis procedures.

Service Type: Laboratory test (urinalysis component)

Typical Site of Service: Clinical laboratory or hospital laboratory

Clinical Context

A typical patient is an adult presenting to an outpatient clinic or urgent care with symptoms suggesting hepatic dysfunction or altered bilirubin metabolism, such as jaundice, dark urine, pale stools, abdominal pain, nausea, or suspected hemolysis. The clinician orders urinalysis including a urobilinogen assay (84578) to evaluate urinary urobilinogen levels as part of initial diagnostic workup and monitoring. A clean-catch urine specimen is obtained; the laboratory analyst performs the urobilinogen test either by chemical reagent strip or automated urinalysis platform. Results are reviewed by the ordering provider; elevated urobilinogen can support increased bilirubin turnover or hemolysis, while low or absent urobilinogen with jaundice can indicate obstructive biliary disease. Typical sites of service include hospital outpatient laboratories, independent clinical laboratories, urgent care centers, and physician office-based laboratories. The workflow commonly involves specimen collection, accessioning, testing, documentation of results in the laboratory information system, and transmission of results to the ordering clinician for correlation with hepatic function tests and clinical findings.

Coding Specifications

Modifier	Description	When to Use
`00`	No modifier — standard reporting	Use when no additional billing modifier applies to the lab service.

Taxonomy Code	Specialty	Notes
261QM0800X	Clinical Pathology	Pathologists and clinical laboratory directors responsible for test interpretation and oversight.
207RC0000X	Internal Medicine	Hospitalist and outpatient internists who order and interpret urinalysis results.
207Q00000X	Family Medicine	Primary care clinicians who order urinalysis and basic laboratory evaluation.
202R00000X	Emergency Medicine	Emergency physicians who order rapid urinalysis in acute presentations.
2084P0800X	Gastroenterology	Specialists managing hepatic or biliary disease who use urobilinogen results for diagnosis and monitoring.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`R17`	Unspecified jaundice	Urobilinogen testing assists in differentiating pre-hepatic, hepatic, or post-hepatic causes of jaundice.
`D59.0`	Autoimmune hemolytic anemia	Hemolysis increases bilirubin turnover and urinary urobilinogen; test helps support hemolytic processes.
`D50.9`	Iron deficiency anemia, unspecified	Anemia evaluation may include urinalysis and urobilinogen when hemolysis vs other causes are considered.
`K83.1`	Obstruction of bile duct	Low or absent urinary urobilinogen with elevated conjugated bilirubin suggests obstructive biliary disease.
`K71.6`	Toxic liver disease with chronic persistent hepatitis	Hepatic dysfunction alters urobilinogen production and excretion; useful for monitoring.
`R82.4`	Abnormal urine color	Dark urine prompts testing for urobilinogen as part of evaluation for bilirubin-related discoloration.
`R79.89`	Other abnormal findings of blood chemistry	Abnormal liver chemistry results often trigger adjunct urine urobilinogen testing for diagnostic correlation.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`81003`	Urinalysis, by dipstick or tablet reagent; non-automated, with microscopy	Often ordered alongside `84578` as part of a complete urinalysis to evaluate urine appearance, concentration, and sediment.
`81002`	Urinalysis, by dipstick or tablet reagent; automated, without microscopy	Commonly performed concurrently on automated platforms that include urobilinogen among dipstick parameters.
`84302`	Lactate dehydrogenase (LD) test	LD is frequently ordered when hemolysis is suspected; correlates with elevated urobilinogen in hemolytic processes.
`82043`	Bilirubin, total and direct (if performed as part of chemistry panel)	Serum bilirubin testing is ordered in parallel to interpret urinary urobilinogen results relative to hepatic vs obstructive patterns.
`80048`	Basic metabolic panel	Performed in same clinical workflow to assess baseline metabolic and renal function which can impact urine testing and interpretation.

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Summary & Overview