Attention Providers/Submitters of Electronic Claims - December 2021 Holiday Cutoff Dates for Receiving Electronic Claim Files 11/16/21. Vaccination Requirements for Healthcare Settings 11/05/21. LDH: Pfizer booster shots are now available to adults at increased risk, following new CDC guidance 09/27/21. HHS announces the availability of $25.5 billion in COVID-19 Provider Funding 09/20/21.