CPT 84106 Urine PBG Test Reimbursement

CPT code 84106 identifies a laboratory assay for porphobilinogen (PBG) in a urine specimen, a key diagnostic test in evaluating suspected porphyria and acute metabolic disorders. Nationally, accurate PBG testing supports timely diagnosis and management of conditions that can lead to serious neurological and systemic symptoms, making correct coding and lab reporting important for clinical workflows and billing compliance.

This analysis covers coverage and billing considerations among major national payers: Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of what CPT code 84106 represents, typical sites of service, and the clinical context for ordering the test. The publication outlines common payer coverage themes, benchmark considerations, and coding guidance related to lab service lines. It also highlights where input data is unavailable and flags topics that may require payer-specific policy lookup.

Intended for coding professionals, lab managers, and health policy analysts, the content helps users understand the clinical purpose of the test, expectations for where it is performed, and which national payers are most relevant for coverage and reimbursement inquiries.

Billing Code Overview

CPT code 84106 describes a laboratory test performed by a lab analyst to detect porphobilinogen (PBG) in a urine specimen. The procedure assesses the presence of PBG, a biochemical marker used in the evaluation of suspected porphyrias and related metabolic disorders.

Service type: Clinical laboratory test (qualitative or quantitative assay for PBG in urine)
Typical site of service: Clinical laboratory or hospital laboratory, with specimen collection performed in outpatient clinics, inpatient settings, or ambulatory collection sites

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Clinical Context

A 28-year-old adult presents to an urgent care clinic with episodic abdominal pain, nausea, vomiting, and new-onset dark urine. The clinician obtains a random urine specimen during the visit and orders testing for porphobilinogen to evaluate for acute intermittent porphyria during an acute symptomatic episode. The specimen is sent to the outpatient laboratory; the lab analyst performs a qualitative or quantitative assay to detect porphobilinogen in urine using a colorimetric or chromatographic method. Results are reported to the ordering clinician, who uses the result to guide further evaluation, urgent management, and possible referral to a metabolic or neurology specialist. Typical site of service is an outpatient clinic, urgent care, or hospital outpatient laboratory where specimens are collected and analyzed. The service type is a clinical laboratory procedure for biochemical diagnostic testing of urine for porphobilinogen, billed under 84106.

Coding Specifications

Modifier	Description	When to Use
`26`	Professional component	Use when billing only the professional interpretation component separate from the technical laboratory processing, if applicable.
`TC`

Taxonomy Code	Specialty	Notes
`2080P0207X`	Clinical Pathology	Physicians who oversee laboratory testing and result interpretation for biochemical assays.
`208000000X`	Pathology & Laboratory Medicine	Pathologists and laboratory directors responsible for test validation and reporting.
`354M00000X`	Medical Laboratory Technologist	Laboratory professionals who perform the assay and technical processing.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`E80.29`	Other porphyrin metabolism disorders	Directly related to disorders of porphyrin metabolism for which urine porphobilinogen testing is indicated.
`G43.A9`	Other migraine not intractable, without status migrainosus	Headache syndromes may prompt evaluation including porphobilinogen when neurologic symptoms suggest porphyria.
`R10.9`	Abdominal pain, unspecified	Common presenting symptom in acute porphyric attacks prompting `84106` testing.
`R11.2`	Nausea with vomiting, unspecified	Nausea and vomiting are frequent features of acute porphyria and justify urine PBG testing.
`R31.9`	Hematuria, unspecified	Evaluation of dark or discolored urine includes porphobilinogen testing to distinguish porphyrinuria from hematuria or bilirubinuria.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`81002`	Urinalysis, by dipstick or tablet reagent for bilirubin, glucose, hemoglobin, ketones, leukocytes, nitrite, pH, specific gravity, etc., non-automated, without microscopy	Often performed at point of care to screen urine appearance and basic analytes during evaluation for dark urine and to complement `84106` results.
`82043`	Bilirubin; urine	Bilirubin testing can be ordered alongside porphobilinogen when urine discoloration is present to differentiate causes of dark urine.
`83970`	Porphyrins; urine	Quantitative urine porphyrin testing is commonly performed before or after `84106` when porphyria is suspected for a more comprehensive porphyrin profile.
`80048`	Basic metabolic profile (Calcium, total; Carbon dioxide; Chloride; Potassium; Sodium; Glucose; BUN; Creatinine)	Electrolyte and metabolic panels are commonly ordered in acute presentations to assess metabolic disturbances associated with porphyric attacks.
`96372`	Therapeutic, prophylactic, or diagnostic injection (specify substance or drug); subcutaneous or intramuscular	If an urgent medication (e.g., antiemetic or analgesic) is administered during the visit when collecting specimen for `84106`, this code may appear in the same encounter.

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Summary & Overview

CPT 84106: Urine Porphobilinogen (PBG) Test