I believe for the flu vaccine it is once per flu season. Therefore a person could receive theflu vaccine in Jan or Feb 2014 and receive it again in Sept- Dec 2014. Separate flu seasons.
Pub 100-4, chpt 18, section 10.1.2.
Quick Reference Chart for Immunization
http://www.cms.gov/Outreach-and-Edu...k-MLN/MLNProducts/downloads/qr_immun_bill.pdf
CMS Q&A
If a beneficiary gets a seasonal influenza virus vaccine more than once
in a 12-month period, will Medicare still pay for it?
Yes, Medicare pays for one seasonal influenza virus vaccination per influenza
season; however, a beneficiary could get the seasonal influenza virus vaccine
twice in a calendar year for two different influenza seasons, and Medicare
would pay the provider for each. For example, a beneficiary could get a
seasonal influenza virus vaccination in January 2013 for the 2012 ? 2013
influenza season and another seasonal influenza virus vaccination in
November 2013 for the 2013 ? 2014 influenza season, and Medicare would
pay for both vaccinations.