CPT 90377: Human Rabies Immunoglobulin, High-Titer
CPT code 90377 represents human rabies immunoglobulin (high-titer) — a pooled plasma-derived gamma globulin used to provide immediate passive immunity for category III rabies exposures. Nationally, timely administration of rabies immunoglobulin is critical for preventing rabies infection after high-risk exposures and is an essential element of post-exposure prophylaxis alongside rabies vaccine.
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 use of 90377, typical sites of service where the product is administered, and the operational considerations that affect billing and coverage across major payers. The publication summarizes common coding and billing practice themes for biologic immunoglobulin products, reimbursement benchmarks where available, and payer policy patterns relevant to authorization and administration requirements.
This summary provides clinicians, billing professionals, and policy analysts with the clinical framing and payer landscape for rabies immunoglobulin coded with 90377, helping stakeholders understand where this service fits within post-exposure care and payer coverage considerations at a national level.
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Billing Code Overview
CPT code 90377 describes rabies immunoglobulin (human), derived from pooled human plasma, high-titer used to provide passive immunity for prevention or treatment of category III rabies exposures. These products supply ready-made antibodies to neutralize rabies virus and are administered as part of post-exposure prophylaxis when immediate passive immunization is required.
Service Type: Immune globulin product administration for rabies post-exposure prophylaxis
Typical Site of Service: Hospital outpatient department, emergency department, clinic, or other acute care settings where post-exposure prophylaxis is provided
Data not available in the input.
Clinical & Coding Specifications
Clinical Context
A typical patient is a person with a category III potential rabies exposure (e.g., single or multiple transdermal bites or scratches, contamination of mucous membrane with saliva from a rabid or suspect animal). The patient presents to the emergency department, urgent care, or public health clinic within hours of exposure. Clinical workflow: triage assessment of wound and exposure type; wound cleaning and local care; determination of rabies prophylaxis need; administration of rabies immunoglobulin (90377) infiltrated into and around the wound site with any remaining volume given intramuscularly, concurrently with initiation of rabies vaccine series. Documentation includes exposure details (animal type, provoked vs unprovoked), wound description, informed consent, lot numbers and amounts of 90377 administered, concurrent vaccine doses, and patient education and follow-up for vaccine schedule. Typical sites of service are Emergency Department, Urgent Care, Hospital Outpatient Clinic, and Public Health Clinic.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
00 | No modifier – standard reporting | Use when no special circumstances or modifiers apply to the administration of 90377. |
11 | Office or outpatient E/M service | Use when 90377 is furnished in an office or outpatient clinic and billing requires an E/M primary service indicator. |
22 | Increased procedural services | Use when substantially greater work is performed than typical (rare for standard IG infiltration). |
23 | Unusual anesthesia | Use if unusual anesthesia unrelated to the procedure was required during administration. |
52 | Reduced services | Use when 90377 administration is partially reduced or not completed as planned. |
59 | Distinct procedural service | Use when 90377 is billed on the same day as another procedure and it is distinct and separate from other services. |
78 | Return to OR for related procedure | Use if patient returns to the operating room for a related procedure following initial administration (uncommon). |
80 | Assistant surgeon | Use when an assistant surgeon is involved in a procedure related to the IG administration and billing requires reporting. |
JW | Drug discarded/not administered to patient | Use when part of a provided vial is discarded and must be reported as discarded drug. |
JZ | No wastage/no discarded drug | Use when no portion of the vial was discarded. |
QK | Monitored anesthesia care by CRNA | Use when monitored anesthesia care by a CRNA was provided during administration. |
QX | CRNA service with physician direction | Use when a CRNA provided services under physician direction. |
QY | Medical direction of CRNA | Use when physician medically directed CRNA services were billed. |
| Taxonomy Code | Specialty | Notes |
|---|---|---|
207Q00000X | Emergency Medicine | ED clinicians commonly assess exposures and administer 90377. |
208000000X | Family Medicine | Primary care and urgent care clinicians may provide wound care and prophylaxis. |
206E00000X | Internal Medicine | Hospitalists or outpatient internists may manage inpatient exposures and follow-up. |
174400000X | Infectious Disease | ID specialists advise on rabies prophylaxis in complex cases. |
363L00000X | Public Health | Public health clinic providers administer prophylaxis and coordinate reporting. |
Related Diagnoses
| ICD-10 Code | Description | Clinical Relevance |
|---|---|---|
A82.9 | Rabies, unspecified | Indicates rabies infection or exposure concern prompting rabies immunoglobulin administration. |
Z20.3 | Contact with and (suspected) exposure to rabies | Used for documented exposure to a rabid or potentially rabid animal when giving prophylaxis. |
S01.40XA | Open wound of scalp, unspecified, initial encounter | Example wound code when a bite causes an open scalp wound requiring local infiltration of 90377. |
S01.90XA | Unspecified open wound of head, initial encounter | Generic wound code for head bites where 90377 is infiltrated locally. |
S61.411A | Laceration without foreign body, right forearm, initial encounter | Limb bite example commonly associated with rabies prophylaxis and IG infiltration. |
S61.412A | Laceration without foreign body, left forearm, initial encounter | Alternate limb code for documentation of site-specific infiltration. |
W59.22XA | Struck by dog, initial encounter | Mechanism-of-injury code frequently used when animal bite exposure occurred. |
W54.0XXA | Bitten or struck by dog, initial encounter | Additional animal bite exposure code commonly reported with rabies prophylaxis. |
Related CPT Codes
| CPT Code | Description | Relationship to This Procedure |
|---|---|---|
90471 | Immunization administration (single) | Used to bill administration of a single vaccine dose when rabies vaccine is given concurrently with 90377. |
90472 | Immunization administration (each additional) | Used when multiple vaccine injections are administered during the same visit as 90377. |
99283 | Emergency department visit, moderate severity | Common E/M level for patients presenting to ED for rabies exposure prior to 90377 administration. |
99401 | Preventive medicine counseling (short) | Used for brief counseling and education about rabies prophylaxis and follow-up (site-dependent). |
36415 | Collection of venous blood by venipuncture | Used when baseline labs or serology are obtained in association with the exposure evaluation. |