MedicaidBilling CodesMedium impact
Reimbursement for the H1N1 Vaccination
Illinois Medicaid - HFS·IL · Family Medicine, General Practice, Internal Medicine +1 more·Provider Notice
Effective date
Oct 1, 2009
We identified it
Jun 21, 2026
Summary
Effective October 1, 2009, providers can receive reimbursement for H1N1 vaccine administration using HCPCS code G9141 at $6.40 per administration, plus evaluation and management services. The H1N1 vaccine itself is provided free to providers and should be billed as $0.00 using code G9142.
Action Required
Immediately: Billing team must update system to bill HCPCS code G9141 for H1N1 vaccine administration at $6.40 and G9142 for H1N1 vaccine at $0.00. Add appropriate evaluation and management codes (99xxx or 99211 for vaccine-only visits). Update encounter forms and train staff on new billing examples provided in the policy.