CPT 90281: Immunoglobulin Therapy, Passive Immunity
CPT code 90281 denotes the provision of immunoglobulin, a protein used to deliver passive immunity against a range of infections. Immunoglobulin therapies are clinically important for patients with immune deficiencies, certain autoimmune conditions, and for prophylactic protection in specific exposures. Nationally, the code is relevant for payers, providers, and infusion centers that manage and bill for parenteral immunoglobulin products.
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 immunoglobulin use, common billing and service settings, and the types of benchmarks and policy topics typically associated with specialty biologic and infusion therapies. The publication outlines typical sites of service where CPT code 90281 is billed and explains the role of this code within broader immunoglobulin utilization and coverage discussions.
The content is intended to inform billing staff, revenue cycle managers, and policy analysts about the clinical purpose of the code, payer coverage landscape, and areas where payers commonly apply utilization controls or prior authorization for immunoglobulin therapies. Data not available in the input is noted where applicable.
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Billing Code Overview
CPT code 90281 describes immunoglobulin, a complex protein produced by certain immune cells that provides passive immunity against infections. The service represented by this code is the provision of immunoglobulin preparations for therapeutic or prophylactic use.
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Service type: Therapeutic immunoglobulin product administration
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Typical site of service: Infusion center, hospital outpatient department, or clinic setting where parenteral immunoglobulin is prepared and administered
Clinical & Coding Specifications
Clinical Context
A typical patient is an adult or pediatric patient with primary or secondary immunodeficiency, autoimmune disease requiring passive immunotherapy, or recurrent severe infections who receives immunoglobulin therapy to provide passive immunity. The clinical workflow begins with an order from an immunologist, neurologist, hematologist, or primary care provider documenting the indication and dose. Verification of patient identity, allergies, and baseline vital signs occurs in an infusion center, hospital outpatient infusion clinic, physician office-based infusion suite, or home infusion setting. Pre-infusion assessment includes review of prior reactions, current medications, and laboratory data (e.g., immunoglobulin levels, renal function). The product is prepared according to manufacturer instructions and institutional policies, administered intravenously or subcutaneously by trained nursing staff, and monitored for infusion-related adverse events (e.g., infusion reactions, anaphylaxis, renal dysfunction, thromboembolic events). Post-infusion documentation includes dose, lot numbers, infusion rate adjustments, patient tolerance, and discharge instructions. Billing captures the immunoglobulin product administration and any applicable facility, professional, or supply components using the appropriate CPT and modifier codes for the service location and circumstances.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
00 | Default/No modifier | Use when no specific modifier applies to the service. |
22 | Increased procedural services | Use when the immunoglobulin administration required substantially greater work or resources than usual (rare for infusion but can apply with complex monitoring or unusual clinical management). |
23 | Unusual anesthesia | Use when general anesthesia is provided for medical reasons during administration (uncommon). |
26 | Professional component | Use when reporting only the professional component of a service related to immunoglobulin administration (e.g., physician oversight separate from facility billing). |
52 | Reduced services | Use when the immunoglobulin administration was partially reduced or not completed as planned (e.g., early termination due to reaction). |
53 | Discontinued procedure | Use when the infusion was started but discontinued due to patient instability or adverse reaction. |
62 | Two surgeons | Use when two qualified providers of different specialties are required for the infusion procedure or management (rare). |
78 | Return to operating/procedure room for a related procedure during the postoperative period | Use if the patient requires an unplanned return to a procedure area for management of a complication related to the infusion. |
80 | Assistant surgeon | Use when an assistant surgeon provides significant intra-procedural assistance related to a procedure connected with immunoglobulin administration (rare). |
82 | Assistant surgeon (when qualified resident not available) | Use as an alternative to 80 when a qualified resident is not available. |
AS | Physician assistant, nurse practitioner, or clinical nurse specialist services for assistant at surgery | Use when an advanced practice clinician assists during a related procedural intervention. |
QK | Service furnished in part by a CRNA | Use when a certified registered nurse anesthetist provides anesthesia services related to the infusion. |
QX | CRNA service with medical direction by a physician | Use when CRNA provides the service and a physician medically directs. |
QY | Medical direction of two, three or four concurrent anesthesia procedures | Use when physician directs multiple concurrent anesthesia services related to infusion. |
TC | Technical component | Use when billing only the technical component (facility supplies/equipment) of the immunoglobulin administration. |
| Taxonomy Code | Specialty | Notes |
|---|---|---|
| 2086S0001X | Allergy & Immunology | Specialists who diagnose immunodeficiency and order immunoglobulin therapy. |
| 207RH0000X | Hematology & Oncology | Manage immunodeficiency, hematologic disorders, and indications such as immune thrombocytopenia. |
| 207LP2900X | Neurology | Manage autoimmune neurologic disorders treated with immunoglobulin (e.g., CIDP, Guillain-Barré). |
| 363LF0200X | Infusion Nurse | Provide administration and monitoring in outpatient and home settings. |
| 208D00000X | Pediatrics | Pediatric specialists managing primary immunodeficiency who prescribe and oversee therapy. |
Related Diagnoses
| ICD-10 Code | Description | Clinical Relevance |
|---|---|---|
D80.9 | Immunodeficiency disorder, unspecified | Common indication for immunoglobulin replacement to reduce recurrent infections. |
D80.1 | Selective deficiency of immunoglobulin G | Specific immunoglobulin deficiency often treated with replacement therapy. |
G61.0 | Guillain-Barré syndrome | Acute immune-mediated neuropathy treated with intravenous immunoglobulin as first-line therapy. |
G61.81 | Chronic inflammatory demyelinating polyneuropathy | Neurologic autoimmune disorder treated with periodic immunoglobulin infusions. |
M32.9 | Systemic lupus erythematosus, unspecified | Autoimmune disease that may require immunomodulatory therapy including immunoglobulin in select cases. |
D61.9 | Aplastic anemia, unspecified | Hematologic conditions where immunoglobulin may be used for immune-mediated complications. |
D59.3 | Autoimmune hemolytic anemia | Immune-mediated hematologic disorder where immunoglobulin can be used as adjunctive therapy. |
Related CPT Codes
| CPT Code | Description | Relationship to This Procedure |
|---|---|---|
96365 | Intravenous infusion, therapeutic, prophylactic, or diagnostic; initial, up to 1 hour | Often used for the beginning time-based billing of an intravenous immunoglobulin infusion session when reporting infusion administration time. |
96366 | Intravenous infusion, each additional hour (List separately in addition to code for primary infusion) | Used to report subsequent hours of prolonged IV immunoglobulin infusion beyond the first hour. |
96372 | Therapeutic, prophylactic, or diagnostic injection (specify substance or drug); subcutaneous or intramuscular | Used when immunoglobulin is administered subcutaneously in bolus form in some protocols. |
36415 | Collection of venous blood by venipuncture | Performed for pre-infusion laboratory testing such as baseline IgG, renal function, or serologies. |
99070 | Supplies and materials (e.g., saline flushes, IV tubing) | Used to bill for non-covered supplies associated with immunoglobulin administration when allowed by payer policies. |