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Official Description

Respiratory syncytial virus, monoclonal antibody, recombinant, for intramuscular use, 50 mg, each

© Copyright 2026 American Medical Association. All rights reserved.

Common Language Description

The CPT® Code 90378 refers to a specific immunizing agent known as the respiratory syncytial virus (RSV) monoclonal antibody, which is a recombinant product intended for intramuscular use. This monoclonal antibody is designed to provide passive immunity against RSV, a virus that can cause severe respiratory infections, particularly in infants and young children. The antibody works by neutralizing the virus, thereby helping to prevent infection in high-risk populations. The production of this monoclonal antibody utilizes advanced recombinant DNA technology, which combines sequences from both murine (mouse) and human antibodies to create a product that is effective in conferring immunity. The administration of this antibody is typically done through an intramuscular injection, and it is recommended to be given on a monthly basis to infants who are at high risk for RSV infection. These high-risk infants include those who are premature, those with underlying conditions that compromise pulmonary function, and those with congenital heart disease. The dosage of the monoclonal antibody is determined based on the infant's weight, ensuring that each patient receives an appropriate amount of the medication. It is important to note that when billing for this service, the code 90378 should be reported for each 50 mg dose of the RSV recombinant monoclonal antibody administered intramuscularly, specifically indicating that it is the recombinant globulin product being reported.

© Copyright 2026 Coding Ahead. All rights reserved.

1. Indications

The RSV monoclonal antibody is indicated for use in specific high-risk populations to provide protection against respiratory syncytial virus infections. The following conditions and circumstances warrant the administration of this immunizing agent:

  • Premature Infants Infants born prematurely are at a higher risk for severe RSV disease due to their underdeveloped lungs and immune systems.
  • Infants with Pulmonary Conditions Infants who have existing conditions that affect their pulmonary function, such as chronic lung disease, are more susceptible to complications from RSV infections.
  • Infants with Congenital Heart Disease Those with congenital heart defects may have compromised cardiovascular and respiratory systems, making them particularly vulnerable to the effects of RSV.

2. Procedure

The administration of the RSV monoclonal antibody involves several key procedural steps to ensure safety and efficacy:

  • Step 1: Patient Assessment Prior to administration, a thorough assessment of the infant's medical history and current health status is conducted to confirm eligibility for the monoclonal antibody treatment. This includes evaluating the infant's weight, as the dosage is weight-dependent.
  • Step 2: Preparation of the Medication The RSV monoclonal antibody is prepared for administration by drawing the appropriate dosage based on the infant's weight. Each dose is typically 50 mg, and the preparation must be done in a sterile environment to prevent contamination.
  • Step 3: Administration The prepared monoclonal antibody is administered via intramuscular injection, typically in the thigh muscle. Care is taken to ensure proper technique to minimize discomfort and ensure effective delivery of the medication.
  • Step 4: Post-Administration Monitoring After the injection, the infant is monitored for any immediate adverse reactions or side effects. This monitoring is crucial to ensure the safety of the patient following the administration of the monoclonal antibody.

3. Post-Procedure

Following the administration of the RSV monoclonal antibody, it is important to observe the infant for any potential side effects or adverse reactions. Commonly, the infant may experience mild discomfort at the injection site, which typically resolves quickly. Parents or caregivers should be informed about signs of allergic reactions or other complications that may require immediate medical attention. The administration of the monoclonal antibody is generally repeated on a monthly basis during the RSV season, and ongoing assessments of the infant's health and risk factors should be conducted to determine the need for continued treatment. Documentation of each administration, including the dosage and any observed reactions, is essential for compliance and billing purposes.

Short Descr RSV MAB IM 50MG
Medium Descr RESPIRATORY SYNCYTIAL VIRUS IG IM 50 MG E
Long Descr Respiratory syncytial virus, monoclonal antibody, recombinant, for intramuscular use, 50 mg, each
Status Code Statutory Exclusion (from MPFS, may be paid under other methodologies)
Global Days XXX - Global Concept Does Not Apply
PC/TC Indicator (26, TC) 9 - Not Applicable
Multiple Procedures (51) 9 - Concept does not apply.
Bilateral Surgery (50) 9 - Concept does not apply.
Physician Supervisions 09 - Concept does not apply.
Assistant Surgeon (80, 82) 9 - Concept does not apply.
Co-Surgeons (62) 9 - Concept does not apply.
Team Surgery (66) 9 - Concept does not apply.
Diagnostic Imaging Family 99 - Concept Does Not Apply
APC Status Indicator Nonpass-Through Drugs and Nonimplantable Biologicals, Including Therapeutic Radiopharmaceuticals
ASC Payment Indicator Drugs and biologicals paid separately when provided integral to a surgical procedure on ASC list; payment based on OPPS rate.
Type of Service (TOS) 1 - Medical Care
Berenson-Eggers TOS (BETOS) Y2 - Other - non-Medicare fee schedule
MUE 4
CCS Clinical Classification 228 - Prophylactic vaccinations and inoculations
GW Service not related to the hospice patient's terminal condition
GY Item or service statutorily excluded, does not meet the definition of any medicare benefit or, for non-medicare insurers, is not a contract benefit
Date
Action
Notes
2011-01-01 Changed Short description changed.
2010-01-01 Changed Code description changed.
2001-01-01 Changed Code description changed.
2000-01-01 Added First appearance in code book in 2000.
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