CPT 90284: Subcutaneous Immunoglobulin Injection (SCIg/IgSC)
CPT code 90284 identifies subcutaneous immunoglobulin (SCIg/IgSC) injections, a method of delivering passive antibody therapy for immunodeficiency and certain immune-mediated conditions. The code matters nationally because subcutaneous administration enables home- or clinic-based delivery, offers an alternative to intravenous immunoglobulin, and affects utilization patterns, care settings, and payer coverage strategies. Key payers referenced in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise explanation of clinical context and service settings for 90284, an outline of common payer coverage footprints, and an overview of what to expect in benchmarking and policy discussions related to subcutaneous immunoglobulin therapy. The publication addresses reimbursement benchmarks, site-of-service implications, and clinical considerations that shape coding and billing for SCIg. Data not available in the input for specific charge ranges, utilization rates, ICD-10 pairings, and taxonomy mappings is noted as unavailable for those items.
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Billing Code Overview
CPT code 90284 describes subcutaneous immunoglobulin (SCIg or IgSC) administration. Immunoglobulin is a complex protein produced by the body to provide passive immunity and protect against infections. This code applies to subcutaneous injection of immunoglobulin formulations used for replacement therapy or immunomodulation.
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Service type: Subcutaneous immunoglobulin injection (SCIg/IgSC)
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Typical site of service: Outpatient clinic, infusion center, or patient home when administered via subcutaneous route
Clinical & Coding Specifications
Clinical Context
A typical patient for 90284 is an adult or pediatric patient with primary or secondary humoral immunodeficiency (for example, common variable immunodeficiency or hypogammaglobulinemia) who receives subcutaneous immunoglobulin (SCIg/IgSC) for passive immunity. The clinical workflow begins with diagnosis and determination of immunoglobulin replacement as medically necessary. The patient is evaluated in an outpatient infusion clinic, allergy/immunology office, or home health setting. Prior to initiation, baseline laboratories (CBC, IgG level, renal function) are obtained and a weight-based dose plan is calculated. For clinic-administered 90284, nursing staff prepare the prescribed SCIg product, select subcutaneous sites, and perform aseptic technique. The patient is observed for local site reactions and systemic adverse events for a brief period after injection. Education is provided on self-administration technique and potential adverse reactions when transitioning to home therapy. Documentation includes indication, lot number, dose, administration route (subcutaneous), injection sites, patient tolerance, and any immediate adverse events.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
00 | No modifier/standard reporting | Used when no special modifier applies to the service. |
22 | Increased procedural services | When work, time, or intensity substantially exceeds typical for 90284. |
52 | Reduced services | When the full service is not performed or only partial dose is administered. |
53 | Discontinued procedure | If administration is started but stopped due to a patient reaction or other complication. |
76 | Data not available in the input. | Data not available in the input. |
78 | Return to operating/procedure room for related procedure during postoperative period | Rarely used; only if a related procedure occurs in the postoperative period. |
80 | Assistant surgeon | Not typically applicable to 90284; included for completeness if an assistant is documented. |
82 | Assistant surgeon when qualified resident not available | As above, uncommon for subcutaneous immunoglobulin. |
AS | Physician assistant, nurse practitioner, or clinical nurse specialist services | When an advanced practice clinician furnishes the injection and payor requires this modifier. |
QX | Service furnished under a specific billing arrangement (modifier for CRNA/AA) | Use if applicable for billing split/shared or CRNA-related rules per payor. |
QY | Service furnished under a Medicare Certified Registered Nurse Anesthetist | Rarely applicable; include only if payer policy requires. |
| Taxonomy Code | Specialty | Notes |
|---|---|---|
| 363L00000X | Allergy & Immunology | Specialists who diagnose and direct Ig replacement therapy. |
| 208000000X | Internal Medicine | Manage adult patients with immunodeficiency and coordinate outpatient infusions. |
| 207Q00000X | Pediatrics | Manage pediatric immunodeficiency patients receiving SCIg. |
| 174400000X | Nursing | Infusion nurses administering SCIg in clinic or home health settings. |
| 174M00000X | Nurse Practitioner | Advanced practice clinicians who may administer and bill for the service. |
Related Diagnoses
| ICD-10 Code | Description | Clinical Relevance |
|---|---|---|
D80.3 | Selective deficiency of immunoglobulin M [IgM] | Represents a primary immunodeficiency that may require immunoglobulin replacement therapy. |
D80.4 | Selective deficiency of immunoglobulin A [IgA] | Patients with recurrent infections may be evaluated for Ig replacement; specific indications vary. |
D83.9 | Common variable immunodeficiency, unspecified | A common indication for maintenance SCIg therapy to reduce infections. |
D84.0 | Immunodeficiency with predominantly antibody defects | Broad category for antibody deficiencies treated with Ig replacement. |
D89.81 | Secondary hypogammaglobulinemia | Secondary causes (e.g., medication-induced) that may necessitate SCIg therapy. |
Related CPT Codes
| CPT Code | Description | Relationship to This Procedure |
|---|---|---|
96372 | Therapeutic, prophylactic, or diagnostic injection (subcutaneous or intramuscular) | Used for administration of subcutaneous medications; sometimes billed when supporting injections or concomitant subcutaneous treatments are given. |
96401 | Chemotherapy administration, subcutaneous or intramuscular; non-hormonal anti-neoplastic | Occasionally referenced for administration technique documentation; not typical for immunoglobulin but similar route-based administration code. |
P9041 | Immune globulin, subcutaneous, 1 g (often used for billing by HCPCS) | Commonly used alongside or instead of 90284 in certain billing systems to report the product quantity (HCPCS codes vary by payer). |
99070 | Supplies and materials provided by the physician over and above those usually included with the service | Used to report ancillary supplies (e.g., infusion pump pads, subcutaneous tubing) when payor allows. |
99000 | Handling and/or conveyance of specimen for transfer from the office to a laboratory | Not typically used for 90284 but may appear if labs are shipped in the same encounter. |