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Official Description

Influenza virus vaccine, quadrivalent (IIV4), split virus, 0.5 mL dosage, for intramuscular use

© Copyright 2025 American Medical Association. All rights reserved.

Common Language Description

The CPT® Code 90688 refers to a specific type of influenza virus vaccine known as the quadrivalent influenza vaccine (IIV4). This vaccine is designed to provide protection against four different strains of the influenza virus, specifically two strains of influenza type A and two strains of influenza type B. The term "quadrivalent" indicates that the vaccine targets multiple strains, enhancing its effectiveness in preventing influenza infections during the flu season. The vaccine is classified as a split virus vaccine, meaning that the virus particles have been chemically disrupted to create a form that is less likely to cause disease while still being able to stimulate an immune response. The dosage for this vaccine is 0.5 mL, and it is administered via intramuscular injection, which is a common method for delivering vaccines directly into the muscle tissue. This method allows for a more effective immune response compared to other routes of administration. It is important to note that the vaccine is produced using embryonated chicken eggs, where the virus is cultivated, harvested, and then inactivated with formaldehyde to ensure safety. The vaccine's formulation is crucial for inducing long-term immunity, as it prompts the immune system to recognize and remember the influenza virus, enabling the body to produce antibodies upon subsequent exposures. For billing purposes, it is essential to report the vaccine product separately from the administration of the intramuscular injection, with code 90688 specifically indicating the 0.5 mL dosage of the quadrivalent influenza vaccine.

© Copyright 2025 Coding Ahead. All rights reserved.

1. Indications

The quadrivalent influenza virus vaccine (IIV4) is indicated for the prevention of influenza disease caused by the four specific strains of the virus it targets. The vaccine is recommended for individuals who are at risk of contracting influenza, particularly during the flu season. The following conditions and populations may warrant the administration of this vaccine:

  • Seasonal Influenza Prevention Individuals seeking to protect themselves from seasonal influenza outbreaks.
  • High-Risk Populations Individuals with chronic health conditions, elderly patients, and those with weakened immune systems who are more susceptible to severe influenza complications.
  • Healthcare Workers Professionals who are in close contact with patients and may be at increased risk of exposure to influenza viruses.
  • Pregnant Women Pregnant individuals who are advised to receive the vaccine to protect both themselves and their unborn child from influenza.

2. Procedure

The administration of the quadrivalent influenza vaccine (IIV4) involves several key procedural steps to ensure proper delivery and effectiveness of the vaccine. The following steps outline the procedure:

  • Step 1: Preparation Prior to administration, the healthcare provider must prepare the vaccine by ensuring it is stored at the appropriate temperature and is not expired. The vial should be inspected for any particulate matter or discoloration, and the provider should gather all necessary supplies, including a sterile syringe and needle.
  • Step 2: Patient Assessment The healthcare provider should assess the patient’s medical history, including any allergies, previous reactions to vaccines, and current health status to confirm that the patient is a suitable candidate for the vaccine.
  • Step 3: Injection Site Selection The provider should select an appropriate injection site, typically the deltoid muscle of the upper arm for adults and older children, or the anterolateral thigh for infants and young children. The site should be cleaned with an alcohol swab to reduce the risk of infection.
  • Step 4: Administration The vaccine is administered via intramuscular injection. The provider should insert the needle at a 90-degree angle to the skin and inject the 0.5 mL dose of the vaccine. After the injection, the needle should be withdrawn quickly and safely disposed of in a sharps container.
  • Step 5: Post-Administration Care After the vaccine is administered, the provider should observe the patient for a short period to monitor for any immediate adverse reactions. Patients should be informed about potential side effects and the importance of reporting any unusual symptoms.

3. Post-Procedure

Post-procedure care for the administration of the quadrivalent influenza vaccine (IIV4) includes monitoring the patient for any immediate adverse reactions, such as allergic responses or injection site reactions. Patients are typically advised to remain in the healthcare setting for a brief observation period following the injection. Common side effects may include soreness at the injection site, mild fever, or fatigue, which usually resolve within a few days. Patients should be educated on the importance of reporting any severe or unusual symptoms that may arise after vaccination. Additionally, it is essential to remind patients that the vaccine does not provide immediate immunity and that it may take up to two weeks for the body to develop a protective immune response. Follow-up appointments may be necessary for individuals requiring additional doses or for those who need to receive the vaccine annually.

Short Descr IIV4 VACCINE SPLT 0.5 ML IM
Medium Descr IIV4 VACC SPLIT VIRUS 0.5 ML DOS FOR IM USE
Long Descr Influenza virus vaccine, quadrivalent (IIV4), split virus, 0.5 mL dosage, for intramuscular use
Related Drugs Afluria Quadrivalent
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 Influenza, Pneumococcal Pneumonia, Hepatitis B, and Covid-19 Vaccines; Monoclonal Antibody Therapy Product
ASC Payment Indicator Influenza vaccine; pneumococcal vaccine.
Type of Service (TOS) V - Pneumococcal/Flu Vaccine
Berenson-Eggers TOS (BETOS) O1G - Immunizations/Vaccinations
MUE 1
CCS Clinical Classification 228 - Prophylactic vaccinations and inoculations
59 Distinct procedural service: under certain circumstances, it may be necessary to indicate that a procedure or service was distinct or independent from other non-e/m services performed on the same day. modifier 59 is used to identify procedures/services, other than e/m services, that are not normally reported together, but are appropriate under the circumstances. documentation must support a different session, different procedure or surgery, different site or organ system, separate incision/excision, separate lesion, or separate injury (or area of injury in extensive injuries) not ordinarily encountered or performed on the same day by the same individual. however, when another already established modifier is appropriate it should be used rather than modifier 59. only if no more descriptive modifier is available, and the use of modifier 59 best explains the circumstances, should modifier 59 be used. note: modifier 59 should not be appended to an e/m service. to report a separate and distinct e/m service with a non-e/m service performed on the same date, see modifier 25.
GA Waiver of liability statement issued as required by payer policy, individual case
X1 Continuous/broad services: for reporting services by clinicians, who provide the principal care for a patient, with no planned endpoint of the relationship; services in this category represent comprehensive care, dealing with the entire scope of patient problems, either directly or in a care coordination role; reporting clinician service examples include, but are not limited to: primary care, and clinicians providing comprehensive care to patients in addition to specialty care
GW Service not related to the hospice patient's terminal condition
GV Attending physician not employed or paid under arrangement by the patient's hospice provider
JZ Zero drug amount discarded/not administered to any patient
SL State supplied vaccine
GC This service has been performed in part by a resident under the direction of a teaching physician
UD Medicaid level of care 13, as defined by each state
55 Postoperative management only: when 1 physician or other qualified health care professional performed the postoperative management and another performed the surgical procedure, the postoperative component may be identified by adding modifier 55 to the usual procedure number.
95 Synchronous telemedicine service rendered via a real-time interactive audio and video telecommunications system: synchronous telemedicine service is defined as a real-time interaction between a physician or other qualified health care professional and a patient who is located at a distant site from the physician or other qualified health care professional. the totality of the communication of information exchanged between the physician or other qualified health care professional and the patient during the course of the synchronous telemedicine service must be of an amount and nature that would be sufficient to meet the key components and/or requirements of the same service when rendered via a face-to-face interaction. modifier 95 may only be appended to the services listed in appendix p. appendix p is the list of cpt codes for services that are typically performed face-to-face, but may be rendered via a real-time (synchronous) interactive audio and video telecommunications system.
AG Primary physician
AQ Physician providing a service in an unlisted health professional shortage area (hpsa)
CC Procedure code change (use 'cc' when the procedure code submitted was changed either for administrative reasons or because an incorrect code was filed)
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
GZ Item or service expected to be denied as not reasonable and necessary
LT Left side (used to identify procedures performed on the left side of the body)
PO Excepted service provided at an off-campus, outpatient, provider-based department of a hospital
Q6 Service furnished under a fee-for-time compensation arrangement by a substitute physician or by a substitute physical therapist furnishing outpatient physical therapy services in a health professional shortage area, a medically underserved area, or a rural area
RT Right side (used to identify procedures performed on the right side of the body)
SA Nurse practitioner rendering service in collaboration with a physician
SK Member of high risk population (use only with codes for immunization)
U1 Medicaid level of care 1, as defined by each state
U6 Medicaid level of care 6, as defined by each state
U7 Medicaid level of care 7, as defined by each state
UC Medicaid level of care 12, as defined by each state
XE Separate encounter, a service that is distinct because it occurred during a separate encounter
XU Unusual non-overlapping service, the use of a service that is distinct because it does not overlap usual components of the main service
Date
Action
Notes
2017-01-01 Changed Long, Medium and Short descriptions changed.
2016-01-01 Changed First appearance of change in codebook.
2015-07-01 Changed Description Changed
2014-01-01 Added First appearance in codebook.
2013-01-01 Added -
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