Summary & Overview

CPT 82172: Apolipoprotein Testing of Lipoprotein Components

CPT code 82172 represents laboratory measurement of apolipoproteins within lipoprotein complexes, including key analytes such as Apo-A1, Apo-B, and Apo-E. These assays provide clinically relevant information about lipid particle composition that can inform cardiovascular risk stratification and management of dyslipidemia. As precision lipid testing grows, apolipoprotein measurement has national relevance for laboratory clinical services, payer coverage policies, and diagnostic workflows.

Key payers in the coverage landscape include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of clinical context and typical sites of service, plus discussion of payer considerations and common billing modifiers used with laboratory CPT codes. The publication furnishes benchmarks where available, summarizes relevant coding relationships, and highlights operational implications for laboratories and billing teams.

This summary is intended for national audiences including laboratory directors, billing managers, clinicians who order lipid testing, and payer policy analysts. Data not available in the input is noted where applicable; the focus remains on clinical meaning, service setting, and how the code is used in routine laboratory practice.

AetnaBlue Cross Blue ShieldCigna HealthUnitedHealthcareMedicare82172CPTApolipoproteinLipid TestingClinical LaboratoryCardiovascular RiskChemistryLaboratory Billing

Billing Code Overview

CPT code 82172 describes apolipoprotein testing performed by a laboratory analyst to measure apolipoproteins associated with lipoprotein complexes, most notably Apo-A1, Apo-B, and Apo-E. The test evaluates protein components of high-, low-, and very-low–density lipoproteins to support assessment of lipid-related cardiovascular risk and related metabolic conditions.

Service Type: Laboratory — Clinical Pathology / Chemistry

Typical Site of Service: Clinical laboratory or hospital laboratory

Clinical & Coding Specifications

Clinical Context

A 56-year-old patient with mixed dyslipidemia and a strong family history of premature coronary artery disease is referred to the clinical laboratory for apolipoprotein testing. The clinician orders apolipoprotein A‑I and apolipoprotein B measurements to further stratify cardiovascular risk after inconsistent LDL-C values and when triglycerides are elevated. The workflow begins with outpatient phlebotomy (fasting sample per local lab protocol), specimen labeling and accessioning, transport to a clinical chemistry laboratory, and testing using immunoassay or nephelometry methods. Results are reviewed by the laboratory analyst, entered into the laboratory information system, and a finalized report is transmitted to the ordering provider (cardiologist or primary care physician). Typical sites of service include hospital clinical laboratories, independent reference laboratories, and large ambulatory laboratory collections. The service is billed under 82172 when apolipoprotein measurements (such as Apo‑A1, Apo‑B, Apo‑E) are performed on patient serum or plasma as part of lipid risk assessment, dyslipidemia evaluation, or specialized lipid management.

Coding Specifications

Modifier	Description	When to Use
`26`	Professional component	Use when billing only the professional interpretation or result reporting by the laboratory director when the technical component is billed separately.
`TC`	Technical component	Use when billing only the laboratory technical component (instrumentation, reagents, technician time).
`90`	Reference (outside) laboratory	Use when specimens are sent to an outside reference laboratory for `82172` testing.
`91`	Repeat clinical diagnostic laboratory test	Use when a repeat apolipoprotein test is performed on the same day for confirmation.
`59`	Distinct procedural service	Use when `82172` is performed in addition to another distinct laboratory procedure on the same day and bundling concerns exist.
`52`	Reduced services	Use when the laboratory performs a reduced version of the test (limited or partial panel) and full service is not rendered.
`53`	Discontinued procedure	Use when testing was initiated but specimens were unsuitable and testing discontinued prior to completion.
`90`	Reference (outside) laboratory	Use when a performing outside lab provides the technical work and billing reflects that relationship.
`91`	Repeat test	Use when a repeat specimen is analyzed to verify previous apolipoprotein results.
`QK`	CLIA waived, waived test performed by non-CLIA waived entity	Use only if applicable in very limited scenarios per payer rules (rare for `82172`).

Taxonomy Code	Specialty	Notes
207RH0000X	Clinical Laboratory	Laboratory medicine specialists and clinical chemists who direct testing and interpretation.
207L00000X	Pathology	Pathologists overseeing clinical chemistry laboratories that perform apolipoprotein analysis.
207K00000X	Clinical Pathology	Clinical pathologists and laboratory directors responsible for quality and result sign-out.
207P00000X	Clinical Biochemistry	Clinical biochemists involved in method validation and analytic interpretation.
208D00000X	Cardiology	Cardiologists ordering `82172` for advanced cardiovascular risk assessment.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`E78.5`	Hyperlipidemia, unspecified	Common indication for apolipoprotein testing to further stratify lipid-related cardiovascular risk.
`E78.0`	Pure hypercholesterolemia	Apolipoprotein measurements assist in assessing particle-related risk beyond LDL-C levels.
`E78.2`	Mixed hyperlipidemia	Elevated triglycerides with abnormal cholesterol often prompt apolipoprotein testing for risk clarification.
`E78.4`	Other hyperlipidemia	Used when specific lipid abnormalities require advanced testing such as apolipoprotein assays.
`I25.10`	Atherosclerotic heart disease of native coronary artery without angina pectoris	Patients with known coronary disease may have apolipoprotein testing for residual risk assessment.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`80061`	Lipid panel; includes total cholesterol, HDL, LDL, triglycerides	Commonly ordered before or alongside `82172` to provide standard lipid profile for cardiovascular risk assessment.
`84378`	Apolipoprotein A-I; immunoassay	Specific assay code sometimes used in labs to report Apo‑A1 when separately identified; complements `82172` result set.
`84379`	Apolipoprotein B; immunoassay	Specific assay code sometimes used for Apo‑B measurement; often ordered with `82172` or reported as part of its panel.
`84478`	Lipoprotein, direct measurement of LDL cholesterol	Performed when LDL calculation is unreliable (e.g., high triglycerides) and may be ordered with apolipoprotein testing for comprehensive assessment.
`83704`	Lipoprotein particle analysis (NMR)	Advanced testing that may be ordered in parallel with apolipoprotein measurements for detailed lipid particle characterization.