CPT 91321: SARS–CoV–2 Vaccine, 25 mcg Intramuscular Injection
Headline: New CPT code 91321 denotes a 25 mcg intramuscular SARS–CoV–2 vaccine product and clarifies national billing for routine COVID–19 immunization.
Lead: CPT code 91321 identifies a SARS–CoV–2 vaccine product formulated as 25 mcg/0.25 mL delivered by intramuscular injection to reduce the risk of COVID–19. This code standardizes reporting for vaccine supply and supports consistent coverage determinations across major payers.
Why it matters: Accurate use of CPT code 91321 matters nationally because it ensures clear communication about vaccine products in claims, supports vaccine inventory and public-health tracking, and informs payer coverage and payment policies. It affects immunization program operations across outpatient sites where intramuscular COVID–19 vaccines are delivered.
Payers in scope: Analysis covers major national payers including Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare.
What readers will learn: The publication explains the clinical product represented by CPT code 91321, typical service settings for administration, common billing considerations, and where to find policy updates and benchmarks. It summarizes payer coverage context and identifies gaps where data were not provided. Data not available in the input are noted where applicable.
Customize your policy alerts
Sign up for cpt 91321 policy alerts
Get alerted when payer policies referencing 91321 are released or updated.
Monitor payer policy activity
Billing Code Overview
CPT code 91321 represents a SARS–CoV–2 vaccine product administered by intramuscular injection to reduce the patient’s risk of contracting COVID–19. The dosage is 25 mcg/0.25 mL.
Service Type: Vaccine administration — intramuscular SARS–CoV–2 immunization
Typical Site of Service: Ambulatory clinic, physician office, pharmacy-based immunization clinic, or other outpatient vaccination setting