Clinical Context
A 45-year-old adult with primary humoral immunodeficiency presents to an outpatient infusion center for immune globulin replacement therapy using asceniv (recombinant hyaluronidase-facilitated subcutaneous human immunoglobulin). The patient arrives after nursing triage confirms recent weight, vital signs, and review of recent laboratory results including IgG trough levels. The infusion nurse reviews indication, verifies the prescription for J1554 (injection, immune globulin (asceniv), 500 mg), confirms venous or subcutaneous access based on product formulation and dosing plan, and prepares product dosing individualized to the patient’s weight and prior tolerability. The workflow includes pre-medication assessment (antipyretics, antihistamines if previously required), verification of consent and adverse reaction plan, administration per product-specific rate escalations, monitoring during and for at least 30–60 minutes post-infusion for infusion reactions, documentation of lot number and units administered, and scheduling of the next maintenance dose.
Typical site of service is an outpatient infusion center, ambulatory infusion clinic, or physician office with infusion services. In some cases, home infusion may be arranged with a certified home infusion provider and appropriate documentation of training and monitoring.
Coding Specifications
| Modifier | Description | When to Use |
|---|
00 | No modifier — full service | Rarely appended; default when no modifier applies |
11 | Patient left AMA or left without being seen (Note: not standard for drugs) | Not typically used for drug administration; avoid for J1554
22 | Increased procedural services | Use when administration required substantially greater resources due to patient complexity (document rationale)
23 | Unusual anesthesia | Generally not applicable for J1554 infusions
52 | Reduced services | Use when lesser amount administered than ordered (document reason)
53 | Discontinued procedure | Use if infusion started but discontinued for medical reasons (adverse reaction) with documentation
62 | Two surgeons | Not applicable to infusion drug administration
78 | Unplanned return to OR | Not applicable to infusion drug administration
80 | Assistant surgeon | Not applicable to infusion drug administration
82 | Assistant surgeon (when no qualified resident) | Not applicable to infusion drug administration
AS | Physician assistant, nurse practitioner, or clinical nurse specialist services | Use when advanced practice clinician provides the service under appropriate state law and payer rules
CO | Cast or orthosis | Not applicable to infusion drug administration
CQ | Service furnished as part of a clinical trial, non-payable | Use when drug administration is part of a clinical trial and the payor defines CQ reporting requirements
FY | Split/shared services (critical care) | Not typically used for routine infusion drug administration
JW | Drug amount discarded/not administered | Use when a portion of a single-use vial or prepared dose is discarded; document discarded amount and reason
JZ | Drug amount zero wasted | Use when no portion was discarded
KX | Requirements specified in the medical policy have been met | Use when payer requires attestation that medical necessity criteria were satisfied
QX | CRNA service: CRNA with medical direction by a physician | Not typically applicable for infusion administration
QY | Medical direction of a CRNA by an anesthesiologist | Not typically applicable for infusion administration
SH | Hearing services provided in rural health clinic | Not applicable
SJ | Nurse practitioner services in CA FQHC/Look-Alike | Use when applicable in federally qualified health center reporting
TG | Via interactive telecommunication system (telemedicine) | Use when supervision or consultation occurred via telehealth per payer rules
| Taxonomy Code | Specialty | Notes |
|---|
364A00000X | Allergy & Immunology | Physicians who diagnose and manage primary immunodeficiency and prescribe immune globulin |
207R00000X | Hematology | Hematologists may prescribe IG for certain immune-mediated hematologic conditions
163W00000X | Nurse Practitioner | NPs who manage infusion clinics and prescribe/administer J1554 under state scope
164W00000X | Physician Assistant | PAs who manage infusion services and assist with administration
310400000X | Clinical Nurse Specialist | CNSs overseeing infusion protocols and monitoring
Related Diagnoses
| ICD-10 Code | Description | Clinical Relevance |
|---|
D80.0 | Hereditary hypogammaglobulinemia | Primary indication for immune globulin replacement therapy with J1554 |
D83.0 | Common variable immunodeficiency with hypogammaglobulinemia | Common primary immunodeficiency treated with immune globulin replacement
D80.1 | X-linked agammaglobulinemia | Indication for long-term immunoglobulin replacement
D84.9 | Immunodeficiency, unspecified | Used when a specific immunodeficiency diagnosis is not yet established but IG therapy is clinically indicated
M35.9 | Systemic involvement of connective tissue disorder, unspecified | Immune globulin may be used for certain autoimmune or immune-mediated systemic disorders
G61.0 | Guillain-Barré syndrome | High-dose immune globulin is a standard treatment for acute management in the inpatient or outpatient infusion setting
M32.10 | Systemic lupus erythematosus, organ or system involvement unspecified | IVIG is used in select refractory autoimmune conditions; documentation must support medical necessity
T88.1 | Other complications following immunization, initial encounter | Rarely relevant; included when IG is used for post-exposure prophylaxis or treatment of vaccine-related complications
Related CPT Codes
| CPT Code | Description | Relationship to This Procedure |
|---|
96365 | Intravenous infusion, for therapy, prophylaxis, or diagnosis; initial, up to 1 hour | May be used for billing initial infusion time when intravenous administration occurs for immune globulin therapies |
96366 | Intravenous infusion, each additional hour | Use for additional hourly infusion time beyond the initial unit when clinically indicated
96372 | Therapeutic, prophylactic, or diagnostic injection (specify substance or drug); subcutaneous or intramuscular | May be used when J1554 is administered subcutaneously in a single injection dose
36415 | Collection of venous blood by venipuncture | Performed for monitoring IgG trough levels or pre-infusion labs
99000 | Handling and/or conveyance of specimen for transfer from patient to laboratory | Use if special handling of laboratory specimens related to IG therapy is required
96374 | Intravenous push, single or initial substance/drug | Rarely used for immune globulin; generally not appropriate for large-volume IG products