Yes, Medicare does cover Adacel. Since January 1, 2023, every Part D plan pays the full cost of the Adacel Tdap vaccine when it is given for routine prevention, with no copay and no deductible.1ASPE. IRA Elimination of Vaccine Cost Sharing Part B picks up the shot instead when it is administered to treat an injury, such as a puncture wound.2CMS.gov. Medicare Part D Vaccines MLN Fact Sheet
Part D Pays the Full Cost for Prevention
Part D covers all commercially available vaccines that are reasonable and necessary to prevent illness and are not already covered by Part B, and CMS lists Tdap explicitly as a Part D vaccine.2CMS.gov. Medicare Part D Vaccines MLN Fact Sheet Because the Advisory Committee on Immunization Practices recommends Tdap for adults, the Inflation Reduction Act’s zero cost-sharing rule applies. Plans cannot bill a copayment, and the deductible does not apply.3Medicare.gov. Tdap Vaccines
This applies whether you have a standalone Part D plan or a Medicare Advantage plan with drug coverage. Before 2023, Part D enrollees often paid around $28 out of pocket for a Tdap dose, and some paid as much as $66.4AARP. What Vaccines Does Medicare Cover Those charges are gone.
When Part B Covers Adacel Instead
The trigger for Part B coverage is an injury or direct exposure to disease. A tetanus-prone puncture wound is the classic example. The provider has to document the injury and the specific body part affected when billing.5Noridian Medicare. Tetanus and Diphtheria Vaccinations Billing Guidelines
Under Part B there is no deductible for the vaccine itself, but you may owe 20% coinsurance on the administration fee.6Univera Healthcare. Understanding Your Vaccines Medicare pays providers for the vaccine at 106% of its Average Sales Price, which CMS updates quarterly.7CMS.gov. Vaccine Pricing
Where To Get the Shot
A pharmacy is the simplest route. The pharmacy bills your Part D plan directly for both the vaccine and the administration on one claim, and you pay nothing at the counter.2CMS.gov. Medicare Part D Vaccines MLN Fact Sheet
A doctor’s office is more complicated. CMS treats Part D networks as pharmacy networks only, so a physician’s office is technically out-of-network for Part D purposes.2CMS.gov. Medicare Part D Vaccines MLN Fact Sheet You still owe nothing for the vaccine itself, but how the claim gets paid depends on the setup:
- The office bills your Part D plan directly through a web portal or claim form and accepts the plan’s payment as payment in full.2CMS.gov. Medicare Part D Vaccines MLN Fact Sheet
- A pharmacy fills the prescription and bills the plan for the vaccine, while the doctor administers it. You may need to pay the doctor’s administration fee upfront and seek reimbursement from the plan afterward.2CMS.gov. Medicare Part D Vaccines MLN Fact Sheet
- You pay the full charge yourself and file a reimbursement claim with your Part D plan. Part D plans can fully reimburse administration fees paid at the time of service.2CMS.gov. Medicare Part D Vaccines MLN Fact Sheet
If you’re planning ahead, calling the pharmacy first and having them bill the Part D plan is the surest way to walk out owing zero.
A Note on Adacel Versus Boostrix
Adacel and Boostrix are the two Tdap vaccines on the market, and Medicare covers them the same way. One difference matters at the pharmacy: Adacel is FDA-approved for ages 10 through 64, while Boostrix is approved for ages 10 and older.8FDA. Package Insert – Adacel9CDC. Use of Tetanus Toxoid, Reduced Diphtheria Toxoid, and Acellular Pertussis Vaccines10CDC. Pertussis Vaccine Recommendations
If You Don’t Have Part D
Original Medicare on its own (Parts A and B) does not cover routine Tdap vaccination, because that use falls under Part D. Without a drug plan, you’d pay the full retail cost.3Medicare.gov. Tdap Vaccines
Retail prices for Adacel vary. As of mid-2026, cash prices range from about $59 at warehouse stores like Costco to around $86 at chain pharmacies like Walgreens, with an average retail price near $112 before any discounts.11SingleCare. Adacel Sanofi, the manufacturer, runs a patient assistance program called Sanofi Patient Connection that may provide the vaccine at no cost to eligible patients with household income at or below 400% of the federal poverty level.12Sanofi Patient Connection. Medicare If you don’t have Part D and expect to need vaccines, adding a plan during an enrollment period will usually be cheaper than paying retail.