CPT code 90688 describes a 0.5 mL intramuscular quadrivalent influenza (flu) vaccine using split virus technology to protect against four influenza strains; this is a vaccine administration service provided as an intramuscular immunization typically delivered in outpatient clinic, physician office, pharmacy, or community vaccination settings for seasonal flu prevention.

For related coverage guidance, see recent payer policy updates: B-Hemolytic Streptococcus Testing, Human Immunodeficiency Virus (HIV) — Coverage Criteria for Testing and Resistance Assays, Hepatitis Testing (A, B, C, D) Coverage Criteria.