Summary & Overview
CPT 90399: Immune Globulin Administration, Unlisted
CPT code 90399 designates the administration of an immune globulin product when no more specific CPT code applies. Used nationally across outpatient clinics, infusion centers, and hospital outpatient departments, this unlisted immune globulin administration code ensures providers can report and bill for clinically necessary immune globulin services that lack a distinct code. It matters because immune globulin therapies are commonly used for immunodeficiency, autoimmune, and inflammatory conditions, and the absence of a product-specific code requires consistent documentation to support medical necessity and billing.
Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find an overview of coding context, common billing considerations, and what to expect when using an unlisted immune globulin administration code. The publication addresses benchmark and policy-related themes: coding rationale for unlisted immune globulin administration, payer coverage considerations, documentation expectations, and typical sites of service where the code is used. Where specific payer policy details are not provided in the input, this summary notes their inclusion in the broader analysis where available.
This piece is intended for a national audience of billing professionals, clinicians involved in infusion therapy, and policy analysts seeking concise guidance on when to report CPT code 90399 and what aspects of billing and documentation are most relevant.
Billing Code Overview
CPT code 90399 is used to report the administration of an immune globulin product that is not represented by a more specific CPT code. This code captures services where a clinician or facility provides an immune globulin preparation for patient treatment when no precise CPT code exists for that specific product or administration scenario.
Service Type: Immune globulin administration
Typical Site of Service: Outpatient clinic, infusion center, or hospital outpatient department
Data not available in the input.
Clinical & Coding Specifications
Clinical Context
A patient with an immune deficiency or an acute immune-mediated condition presents to an outpatient infusion center or hospital clinic for replacement or therapeutic immune globulin therapy that is not represented by a more specific product code. Typical patients include adults or children with primary humoral immunodeficiency, secondary hypogammaglobulinemia related to hematologic malignancy or immunosuppressive therapy, or select autoimmune or inflammatory conditions treated with immune globulin preparations. The clinical workflow includes verification of the order by a physician or advanced practice clinician, pre-infusion assessment (vital signs, allergy history, venous access evaluation), administration of the immune globulin by an infusion nurse or pharmacy-administered protocol, monitoring for infusion reactions during and after the infusion, documentation of lot number and dose, and billing with 90399 when the product administered does not have a more specific CPT code. Typical site of service is an outpatient infusion center, physician office-based infusion suite, or inpatient hospital setting depending on clinical need and payer policies.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
00 | No modifier | Use when no modifier applies and the service is reported without special circumstances. |