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HCPCS J1599: Intravenous Immune Globulin, Liquid, 500 mg

HCPCS Level II code J1599 describes an intravenous immune globulin (non-lyophilized liquid) product billed per 500 mg unit. IVIG therapies are used across multiple immune-mediated conditions and high-cost biologic infusions have significant implications for facility operations, prior authorization workflows, and national payer reimbursement policies. Clear coding for unit-based IVIG products supports accurate utilization tracking and claim adjudication.

Key payers covered in this overview include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise national perspective on coding and billing context for J1599, including typical sites of service and the clinical service type. The publication also outlines what readers can expect from accompanying materials: national benchmarks and utilization patterns where available, recent policy and coverage considerations affecting IVIG administration and billing, and clinical context about IVIG as an infusion therapy.

Data not available in the input for payer-specific rates, associated taxonomies, ICD-10 pairings, related codes, and line-item service details is noted where relevant. This summary is intended for revenue cycle, coding, and policy professionals seeking a focused briefing on HCPCS Level II code J1599 in the national payer environment.

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Billing Code Overview

HCPCS Level II code J1599 represents an intravenous immune globulin (liquid), unit of 500 mg for injection. This code designates administration of a non-lyophilized (liquid) formulation of immune globulin given intravenously and is reported per 500 mg unit.

Service type: Intravenous immune globulin infusion (IVIG)

Typical site of service: Outpatient infusion center, hospital outpatient department, or physician office infusion suite

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HCPCS J1599: Intravenous Immune Globulin, Liquid, 500 mg

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Billing Code Overview

Service type: Intravenous immune globulin infusion (IVIG)

Typical site of service: Outpatient infusion center, hospital outpatient department, or physician office infusion suite

Clinical & Coding Specifications

Clinical Context

A typical patient is an adult with primary or secondary immunodeficiency, chronic inflammatory neuropathy, or certain autoimmune disorders who requires replacement or immunomodulatory therapy administered intravenously. The patient arrives at an outpatient infusion center or hospital outpatient department for administration of intravenous immune globulin (IVIG) using billing code J1599 for a 500 mg unit of liquid (non-lyophilized) immune globulin not otherwise specified. The clinical workflow includes verification of diagnosis and prior authorization, baseline vital signs and weight-based dose calculation, venous access placement (peripheral or central), infusion pump setup with appropriate infusion-rate ramping per product labeling, monitoring for infusion reactions (vital signs, observation for hypersensitivity), management of adverse effects (e.g., premedication or rate adjustment), documentation of lot numbers and batch identifiers, and post-infusion assessment for disposition. Typical sites of service are outpatient infusion centers, hospital outpatient departments, and skilled nursing facilities when clinically indicated. Common patient scenarios include replacement therapy for primary immunodeficiency, treatment for chronic inflammatory demyelinating polyneuropathy (CIDP), prophylaxis or treatment for select antibody-mediated conditions, and adjunctive therapy for certain autoimmune or hematologic disorders.

Coding Specifications

Modifier	Description	When to Use
`00`	Default/No modifier	Use when no additional modifier applies to the service.
`22`	Increased procedural services	Use when work or resources are substantially greater than usually required for IVIG administration (document justification).
`23`	Unusual anesthesia	Rarely used; apply when unusual anesthesia unrelated to the procedure is required for safe IVIG infusion.
`52`	Reduced services	Use when the IVIG infusion is partially reduced or discontinued and less than full service was furnished.
`53`	Discontinued procedure	Use when the IVIG infusion is started but terminated due to patient complication or intolerance.
`55`	Postoperative management only	Not typically applicable; use only if reporting post-op management separate from IVIG.
`56`	Preoperative management only	Not typically applicable; use only if reporting pre-op management separate from IVIG.
`62`	Two surgeons	Rarely applicable; use only if two physicians of the same specialty perform separate portions of care related to IVIG administration.
`78`	Return to operating room	Not typically applicable; use only if a return to the OR is required for a complication related to infusion access.
`AS`	Physician assistant, nurse practitioner, or clinical nurse specialist billing under their own NPI	Use when an APP furnishes the infusion service and bills under their own identifier where payor requires modifier reporting.
`CQ`	Service furnished by a clinic with a qualifying alternative payment model	Use when the infusion is provided by a clinic participating in a qualifying CMS APM and payor requires the modifier.
`FX`	Primary payer noncovered; secondary payment expected	Use when primary payor (e.g., patient’s commercial plan) does not cover IVIG and secondary payer is expected to pay.
`QX`	Service furnished under the supervision of a physician by a PA	Use when a physician delegates supervision to a physician assistant for the infusion service.
`QY`	Service furnished by a physician assistant under physician supervision	Use when the prescribing or supervising physician meets the requirements for PA supervision billing rules.

Taxonomy Code	Specialty	Notes
`363A00000X`	Allergy & Immunology	Common specialty prescribing and managing IVIG for immunodeficiency and autoimmune conditions.
`2084P0800X`	Infusion Nurse	Nursing specialty providing infusion administration and monitoring in outpatient centers.
`207L00000X`	Hematology & Oncology	Hematologists may prescribe IVIG for immune thrombocytopenia or hypogammaglobulinemia related to hematologic disorders.
`2080S0102X`	Neurology	Neurologists commonly use IVIG for CIDP, Guillain-Barré syndrome, and other neuroimmunologic conditions.
`207K00000X`	Rheumatology	Rheumatologists may prescribe IVIG for certain refractory autoimmune connective tissue diseases.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`D80.0`	Hereditary hypogammaglobulinemia	Replacement therapy with IVIG for primary B-cell immunodeficiency.
`D80.1`	Nonfamilial hypogammaglobulinemia	IVIG indicated for acquired antibody deficiency states.
`G61.81`	Chronic inflammatory demyelinating polyneuritis (CIDP)	IVIG is a first-line immunomodulatory treatment for CIDP.
`G61.0`	Guillain-Barre syndrome	IVIG is standard acute therapy for Guillain-Barré syndrome.
`D69.3`	Immune thrombocytopenic purpura (ITP)	IVIG is used for rapid increase in platelet counts in ITP.
`M32.10`	Systemic lupus erythematosus, organ or system involvement unspecified	IVIG may be used as adjunctive therapy in refractory autoimmune disease.
`D84.1`	Deficiency of antibody formation	IVIG used for replacement in antibody production defects.
`T80.6XXA`	Anaphylactic reaction due to donated blood and blood products, initial encounter	Relevant as a potential adverse reaction to IVIG that may require reporting and management.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`96365`	Intravenous infusion, for therapy, prophylaxis, or diagnosis; initial, up to 1 hour	Used to report the initial therapeutic IV infusion time period for IVIG when administered in outpatient settings.
`96366`	Intravenous infusion, each additional hour (List separately in addition to code for primary service)	Used to report additional hours of IVIG infusion beyond the initial hour when infusion duration exceeds one hour.
`96367`	Intravenous infusion, additional sequential infusion of a new drug, up to 1 hour	Use when a separate sequential infusion is administered after completion of the initial IVIG infusion.
`36415`	Collection of venous blood by venipuncture	Used for baseline laboratory monitoring (e.g., CBC, CMP, immunoglobulin levels) associated with IVIG therapy.
`36000`	Introduction of needle or catheter into peripheral vein for injection, simple	Used to report placement of peripheral IV access for infusion when separate from facility nursing services.

Related Codes

HCPCS-J0013-ESKETAMINE-NASAL-SPRAY-1MG

HCPCS Level II J0013: Esketamine Nasal Spray, 1 mg

HCPCS-J0120-INJECTION-TETRACYCLINE-250MG

HCPCS J0120: Injection, Tetracycline, Up to 250 mg

HCPCS-J0121-OMADACYCLINE-INJECTION-1MG

HCPCS J0121: Omadacycline Injection, 1 mg

HCPCS-J0122-ERAVACYCLINE-INJECTION-1MG

HCPCS J0122: Injection, Eravacycline, 1 mg

HCPCS-J0129-ABATACEPT-INJECTION-10MG-PHYSICIAN-SUPERVISED

HCPCS J0129: Abatacept Injection, 10 mg

HCPCS-J0130-INJECTION-ABCIXIMAB-10MG

HCPCS Level II J0130: Injection abciximab, 10 mg

HCPCS-J0131-INJECTION-ACETAMINOPHEN-10MG-PARENTERAL-ANALGESIC

HCPCS J0131: Injection Acetaminophen, 10 mg

HCPCS-J0132-INJECTION-ACETYLCYSTEINE-100MG-INJECTABLE-MEDICATION

HCPCS J0132: Injection, Acetylcysteine 100 mg

HCPCS-J0133-ACYCLOVIR-INJECTION-5MG

HCPCS J0133: Injection, Acyclovir 5 mg

HCPCS-J0134-ACETAMINOPHEN-INJECTION-FRESENIUS-KABI-10MG

HCPCS J0134: Injection, Acetaminophen (Fresenius Kabi), 10 mg

Showing 1–10 of 991

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.

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Clinical & Coding Specifications

Clinical Context

Coding Specifications

Modifier	Description	When to Use
`00`	Default/No modifier	Use when no additional modifier applies to the service.
`22`	Increased procedural services	Use when work or resources are substantially greater than usually required for IVIG administration (document justification).
`23`	Unusual anesthesia	Rarely used; apply when unusual anesthesia unrelated to the procedure is required for safe IVIG infusion.
`52`	Reduced services	Use when the IVIG infusion is partially reduced or discontinued and less than full service was furnished.
`53`	Discontinued procedure	Use when the IVIG infusion is started but terminated due to patient complication or intolerance.
`55`	Postoperative management only	Not typically applicable; use only if reporting post-op management separate from IVIG.
`56`	Preoperative management only	Not typically applicable; use only if reporting pre-op management separate from IVIG.
`62`	Two surgeons	Rarely applicable; use only if two physicians of the same specialty perform separate portions of care related to IVIG administration.
`78`	Return to operating room	Not typically applicable; use only if a return to the OR is required for a complication related to infusion access.
`AS`	Physician assistant, nurse practitioner, or clinical nurse specialist billing under their own NPI	Use when an APP furnishes the infusion service and bills under their own identifier where payor requires modifier reporting.
`CQ`	Service furnished by a clinic with a qualifying alternative payment model	Use when the infusion is provided by a clinic participating in a qualifying CMS APM and payor requires the modifier.
`FX`	Primary payer noncovered; secondary payment expected	Use when primary payor (e.g., patient’s commercial plan) does not cover IVIG and secondary payer is expected to pay.
`QX`	Service furnished under the supervision of a physician by a PA	Use when a physician delegates supervision to a physician assistant for the infusion service.
`QY`	Service furnished by a physician assistant under physician supervision	Use when the prescribing or supervising physician meets the requirements for PA supervision billing rules.

Taxonomy Code	Specialty	Notes
`363A00000X`	Allergy & Immunology	Common specialty prescribing and managing IVIG for immunodeficiency and autoimmune conditions.
`2084P0800X`	Infusion Nurse	Nursing specialty providing infusion administration and monitoring in outpatient centers.
`207L00000X`	Hematology & Oncology	Hematologists may prescribe IVIG for immune thrombocytopenia or hypogammaglobulinemia related to hematologic disorders.
`2080S0102X`	Neurology	Neurologists commonly use IVIG for CIDP, Guillain-Barré syndrome, and other neuroimmunologic conditions.
`207K00000X`	Rheumatology	Rheumatologists may prescribe IVIG for certain refractory autoimmune connective tissue diseases.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`D80.0`	Hereditary hypogammaglobulinemia	Replacement therapy with IVIG for primary B-cell immunodeficiency.
`D80.1`	Nonfamilial hypogammaglobulinemia	IVIG indicated for acquired antibody deficiency states.
`G61.81`	Chronic inflammatory demyelinating polyneuritis (CIDP)	IVIG is a first-line immunomodulatory treatment for CIDP.
`G61.0`	Guillain-Barre syndrome	IVIG is standard acute therapy for Guillain-Barré syndrome.
`D69.3`	Immune thrombocytopenic purpura (ITP)	IVIG is used for rapid increase in platelet counts in ITP.
`M32.10`	Systemic lupus erythematosus, organ or system involvement unspecified	IVIG may be used as adjunctive therapy in refractory autoimmune disease.
`D84.1`	Deficiency of antibody formation	IVIG used for replacement in antibody production defects.
`T80.6XXA`	Anaphylactic reaction due to donated blood and blood products, initial encounter	Relevant as a potential adverse reaction to IVIG that may require reporting and management.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`96365`	Intravenous infusion, for therapy, prophylaxis, or diagnosis; initial, up to 1 hour	Used to report the initial therapeutic IV infusion time period for IVIG when administered in outpatient settings.
`96366`	Intravenous infusion, each additional hour (List separately in addition to code for primary service)	Used to report additional hours of IVIG infusion beyond the initial hour when infusion duration exceeds one hour.
`96367`	Intravenous infusion, additional sequential infusion of a new drug, up to 1 hour	Use when a separate sequential infusion is administered after completion of the initial IVIG infusion.
`36415`	Collection of venous blood by venipuncture	Used for baseline laboratory monitoring (e.g., CBC, CMP, immunoglobulin levels) associated with IVIG therapy.
`36000`	Introduction of needle or catheter into peripheral vein for injection, simple	Used to report placement of peripheral IV access for infusion when separate from facility nursing services.

Related Codes

HCPCS-J0013-ESKETAMINE-NASAL-SPRAY-1MG

HCPCS Level II J0013: Esketamine Nasal Spray, 1 mg

HCPCS-J0120-INJECTION-TETRACYCLINE-250MG

HCPCS J0120: Injection, Tetracycline, Up to 250 mg

HCPCS-J0121-OMADACYCLINE-INJECTION-1MG

HCPCS J0121: Omadacycline Injection, 1 mg

HCPCS-J0122-ERAVACYCLINE-INJECTION-1MG

HCPCS J0122: Injection, Eravacycline, 1 mg

HCPCS-J0129-ABATACEPT-INJECTION-10MG-PHYSICIAN-SUPERVISED

HCPCS J0129: Abatacept Injection, 10 mg

HCPCS-J0130-INJECTION-ABCIXIMAB-10MG

HCPCS Level II J0130: Injection abciximab, 10 mg

HCPCS-J0131-INJECTION-ACETAMINOPHEN-10MG-PARENTERAL-ANALGESIC

HCPCS J0131: Injection Acetaminophen, 10 mg

HCPCS-J0132-INJECTION-ACETYLCYSTEINE-100MG-INJECTABLE-MEDICATION

HCPCS J0132: Injection, Acetylcysteine 100 mg

HCPCS-J0133-ACYCLOVIR-INJECTION-5MG

HCPCS J0133: Injection, Acyclovir 5 mg

HCPCS-J0134-ACETAMINOPHEN-INJECTION-FRESENIUS-KABI-10MG

HCPCS J0134: Injection, Acetaminophen (Fresenius Kabi), 10 mg

Showing 1–10 of 991

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.

Published by

Trek Health powers OpenPayer with a leading commercial payer intelligence platform, seamlessly converting fragmented payer data into actionable insights for provider organizations.