CPT 90631: Influenza H5 Adjuvanted Split-Virus Vaccine, IM

CPT code 90631 denotes an intramuscular, adjuvanted, split-virus influenza vaccine targeted to the H5 (avian) pandemic strain. This vaccine category is significant nationally as part of pandemic preparedness and targeted immunization strategies for high-risk populations and broader public health campaigns. The code identifies a distinct vaccine product that may have specific coverage, supply, and administration considerations compared with seasonal influenza vaccines.

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 the H5 adjuvanted vaccine, where and how the service is typically delivered, and the policy and billing implications associated with this distinct vaccine product. The publication outlines coverage considerations and coding guidance relevant to inpatient and outpatient immunization workflows, typical place-of-service patterns, and coding accuracy to ensure appropriate claim submission.

This resource provides national-level context on clinical use, expected sites of service, and administrative considerations for CPT code 90631. Data elements not provided in the input, such as common modifiers, associated taxonomies, and specific ICD-10 pairings, are noted as not available in the input and are excluded from this summary.

Billing Code Overview

CPT code 90631 represents an influenza vaccine, split virus, adjuvanted, H5 (avian) pandemic strain, administered intramuscularly. The service is a vaccination intended to provide immune protection against the pandemic H5 influenza strain.

Service type: Vaccine administration (intramuscular)

Typical site of service: Outpatient clinic, physician office, public health clinic, or designated vaccination site

Clinical Context

A typical scenario involves an adult or pediatric patient presenting to a clinic, occupational health site, public health vaccination clinic, or hospital outpatient department during a public health response to an H5 (avian) influenza pandemic. The vaccine administration is ordered by a physician, nurse practitioner, or public health authority to provide active immunization against the H5 strain. The workflow includes patient screening for contraindications (severe allergic reaction to prior influenza vaccine or vaccine components), informed consent, documentation of lot number and manufacturer, intramuscular administration (usually deltoid for adults, anterolateral thigh for infants), and observation for a short post-vaccination interval for adverse reactions. Billing uses 90631 for the split-virus, adjuvanted intramuscular H5 influenza vaccine product. Typical sites of service are outpatient clinics, community vaccination events, urgent care centers, employee health clinics, and hospital outpatient departments. Common patient presentations include requests for immunization due to occupational exposure risk, travel to an affected region, or public health recommendation during an outbreak.

Coding Specifications

Modifier	Description	When to Use
`25`	Significant, separately identifiable evaluation and management service by the same physician on the same day of the procedure	Use when an E/M visit is medically necessary and distinct from the vaccine administration on the same date.

Taxonomy Code	Specialty	Notes
`207Q00000X`	Family Medicine	Family physicians commonly administer vaccines in outpatient clinics.
`208000000X`	Internal Medicine	Internists provide adult vaccinations in clinic settings.
`163WL0500X`	Public Health	Public health professionals oversee mass vaccination campaigns and clinic-based administration.
`363A00000X`	Preventive Medicine	Preventive medicine specialists involved in immunization programs and policy.
`207L00000X`	Pediatric Medicine	Pediatricians administer vaccines to pediatric and adolescent populations.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`Z23`	Encounter for immunization	Primary code used to indicate the patient received immunization services, appropriate for billing vaccine administration.
`J09.X2`	Influenza due to identified novel influenza A virus with other respiratory manifestations	Used when there is confirmed or suspected novel influenza strain exposure; supports public health vaccination context.
`Z71.1`	Person with feared health complaint in whom no diagnosis is made (vaccination counseling)	Used when counseling about immunization occurs without a separate diagnosis.
`Z20.828`	Contact with and (suspected) exposure to other viral communicable diseases	Used when vaccine is given due to exposure risk assessment.
`Z29.1`	Prophylactic vaccination and inoculation against communicable disease	Alternative code indicating preventive vaccination against communicable disease.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`90460`	Immunization administration through 18 years of age via any route of administration with counseling by physician or other qualified health care professional; first vaccine/toxoid component	Used when administering vaccines to patients under 19 that include counseling; may be reported for vaccine administration for pediatric H5 recipients if age-appropriate and payor allows.
`90461`	Each additional vaccine/toxoid component administered (List separately in addition to code for primary vaccine)	Use when multiple vaccine components are administered during the same visit for pediatric patients.
`90471`	Immunization administration (single vaccine/toxoid) intramuscular or subcutaneous	Used to report the administration of a single intramuscular vaccine for adult patients when specific vaccine administration codes are required.
`90472`	Each additional vaccine/toxoid administered (single or combination vaccine)	Used when multiple intramuscular vaccines are given in the same visit.
`99211`	Office or other outpatient visit for the evaluation and management of an established patient that may not require the presence of a physician	May be reported when minimal E/M services are provided along with vaccine administration, depending on documentation and payor rules.
`99213`	Office or other outpatient visit for the evaluation and management of an established patient, typically 15 minutes	May be reported when a medically necessary, separately identifiable E/M service is provided on the same day as vaccine administration and properly documented with modifier `25`.

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Summary & Overview