Summary & Overview

CPT 80422: Arginine-Stimulated Glucose and Insulin, Three-Sample Assay

CPT code 80422 denotes a stimulated endocrine laboratory test that measures glucose and insulin on three plasma samples collected at distinct time points to assess pancreatic response to a stimulant such as arginine. This specialized assay is used in diagnostic evaluation of insulin secretion and glucose regulation and has implications for endocrine, metabolic, and inpatient/outpatient care pathways. Nationally, accurate coding for such multi-sample endocrine stimulation tests matters for clinical reporting, laboratory quality metrics, and payer coverage determinations.

Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of clinical context for CPT code 80422, typical sites of service, and common modifiers associated with laboratory services. The publication outlines what stakeholders need to know about billing and clinical application: how the test is performed (three timed plasma samples with a stimulant), where it is typically performed (hospital outpatient labs and specialized endocrine testing centers), and which payers commonly cover such services. Where specific payer policies, benchmarks, or related code mappings are not provided in the input, the report notes that data is not available in the input. This summary serves clinicians, laboratory administrators, and coding professionals seeking a national-level briefing on CPT code 80422 and its role in endocrine diagnostic workflows.

AetnaBlue Cross Blue ShieldCigna HealthUnitedHealthcareMedicareCPT 80422endocrine testingglucose insulin assaystimulated testinglaboratorypancreatic functiondiagnostic testhospital outpatient

Billing Code Overview

CPT code 80422 describes a laboratory procedure in which a lab analyst measures glucose and insulin levels on a total of three plasma samples collected at three different times during a stimulated test. The assay evaluates the pancreatic response to a stimulant such as arginine by quantifying changes in both analytes over the sampling period.

Service type: Laboratory functional endocrine test

Typical site of service: Hospital outpatient laboratory, specialized endocrine or metabolic testing center, or clinical laboratory that performs stimulated endocrine function testing.

Clinical & Coding Specifications

Clinical Context

A 48-year-old patient with suspected beta-cell dysfunction is referred to an endocrinology clinic for an arginine-stimulated insulin secretion test. The patient arrives fasting; an intravenous catheter is placed and baseline plasma samples for glucose and insulin are collected. A single bolus of arginine (stimulant) is administered, and additional plasma samples are drawn at two subsequent timed intervals (total of three samples). A clinical laboratory analyst measures insulin and glucose levels from the three plasma specimens to assess pancreatic beta-cell secretory response. The procedure is typically ordered by an endocrinologist for evaluation of hypoglycemia of unclear etiology, investigation of insulin deficiency versus insulin resistance, or assessment of residual beta-cell function in patients with diabetes. Typical site of service is an outpatient hospital laboratory, hospital outpatient department, or specialized endocrine testing center. The workflow includes pre-procedure fasting instructions, IV placement, stimulant administration, timed blood draws, sample handling and processing by the laboratory, and result interpretation by the ordering clinician.

Coding Specifications

Modifier	Description	When to Use
`26`	Professional component	Use when reporting only the physician interpretation/professional component separate from the laboratory technical component.
`TC`	Technical component	Use when reporting only the laboratory performing the specimen collection and analysis (no physician interpretation billed separately).
`90`	Reference (outside) laboratory	Use when the test was performed by an outside independent laboratory and only the reporting physician bills for the result.
`59`	Distinct procedural service	Data not available in the input.
`52`	Reduced services	Use when the procedure is partially reduced or not fully performed as described.
`53`	Discontinued procedure	Use when the test is started but discontinued for patient safety or other valid reason.
`90`	Duplicate entry removed	Data not available in the input.
`91`	Repeat clinical diagnostic laboratory test	Data not available in the input.
`90`	Duplicate entry removed	Data not available in the input.
`90`	Duplicate entry removed	Data not available in the input.

Taxonomy Code	Specialty	Notes
`207R00000X`	Endocrinology, Diabetes & Metabolism	Endocrinologists commonly order and interpret stimulated insulin testing.
`208000000X`	Clinical Pathology	Pathologists and clinical laboratory specialists oversee assay performance and quality control.
`208D00000X`	Diagnostic Laboratory Practitioner	Laboratory directors and clinical chemists responsible for technical performance of assays.
`207L00000X`	Internal Medicine	Internists with endocrine interest may refer or interpret results in primary care settings.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`E16.2`	Hypoglycemia, unspecified	Evaluates endogenous insulin secretion in patients presenting with hypoglycemia.
`E11.9`	Type 2 diabetes mellitus without complications	Assesses residual beta-cell function or insulin secretory response in diabetes management decisions.
`E10.9`	Type 1 diabetes mellitus without complications	Used when assessing residual insulin production in long-standing type 1 diabetes.
`R73.9`	Hyperglycemia, unspecified	Evaluation of abnormal glucose regulation where insulin response needs characterization.
`E13.9`	Other specified diabetes mellitus without complications	For atypical diabetes types where beta-cell function assessment is indicated.
`R73.01`	Impaired fasting glucose	Investigation of borderline glycemic abnormalities and pancreatic response to stimulants.
`E89.1`	Postprocedural hypoinsulinemia	Assessment of insulin secretion after pancreatic surgery or procedures affecting beta-cell mass.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`80422`	Measurement of glucose and insulin on three plasma samples during an arginine-stimulated test	Primary code describing the laboratory analysis of three timed plasma samples for glucose and insulin after stimulant administration.
`36415`	Collection of venous blood by venipuncture	Venipuncture is typically performed to obtain the timed plasma specimens required for the test.
`82947`	Glucose; quantitative, blood (e.g., glucose oxidase)	Individual glucose assay that may be performed as part of or in addition to the bundled panel measurements.
`84460`	Insulin; total	Individual insulin assay that may be performed as part of or in addition to the bundled panel measurements.
`99000`	Handling and/or conveyance of specimen to laboratory	Ancillary service sometimes billed when specimen handling logistics are separately reportable.