Does Medicare Cover Tetanus Shots?

Routine tetanus shots (Tdap/Td): covered by Part D at $0

If you are getting a tetanus shot for routine prevention — not because of a fresh injury — Medicare treats it as an ACIP-recommended adult vaccine. These vaccines are covered under Medicare Part D (the prescription drug benefit), not under Part B.

This includes the Tdap vaccine (which protects against tetanus, diphtheria, and pertussis/whooping cough) and the Td vaccine (tetanus and diphtheria). Adults are generally advised to keep tetanus protection current with a booster about every 10 years, and Part D covers that routine booster.

Thanks to the Inflation Reduction Act, beginning January 1, 2023, cost sharing and the deductible were eliminated for ACIP-recommended adult vaccines covered under Part D. That means if you have Part D, you pay $0 for a routine Tdap or Td shot — no copay and no deductible.

This change has had a large real-world impact: in 2023, about 10.3 million Part D enrollees got a recommended vaccine at no cost, saving more than $400 million in out-of-pocket costs collectively, according to HHS/ASPE data.

Injury-related tetanus shots: covered by Part B

Medicare Part B (medical insurance) covers a tetanus shot when it is given as part of treatment for an injury or a potential exposure to tetanus — for example, a tetanus shot you need after an accidental puncture wound, a deep cut, or stepping on a rusty nail.

Medicare's billing rules (CMS coding article A52438) spell out the specific situation Part B covers: one booster injection of tetanus toxoid is covered for a patient who has had primary immunization in the past, who has sustained a high-risk wound (one that creates anaerobic conditions where tetanus can grow or carries a real chance of exposure to tetanus spores), and who has not received a tetanus booster within the last 5 years.

In other words, Part B's injury-related coverage is not unlimited. If you already had a booster within the past 5 years, an additional shot for a new wound may not be needed or covered. Your doctor or the emergency department makes this clinical judgment at the time of the injury.

Why Part B denies routine (no-injury) boosters

Many people are surprised to learn that Original Medicare (Part A and Part B) does NOT cover a routine, preventive tetanus booster when there is no injury. This is the most common reason a tetanus claim gets denied by Part B.

Per CMS article A52438, immunizations are excluded from Part B coverage unless directly related to the treatment of an injury or direct exposure. When a tetanus booster is given in the absence of an injury or potential exposure, the injection does not meet Part B coverage criteria — even if the booster is medically appropriate preventive care. Routine preventive vaccines like this are not supposed to be billed to Part B at all; they belong under Part D.

Medicare's contractor Noridian notes that for a beneficiary whose tetanus shot is unrelated to an injury, the vaccine and administration deny as non-covered because there is no Part B benefit category, and directs the beneficiary to check their Part D plan. If you have no Part D plan, you may owe the full out-of-pocket cost for a routine shot.

• Covered by Part B: tetanus shot needed because of a qualifying injury or high-risk wound (with prior primary immunization and no booster in the last 5 years).
• Covered by Part D: routine tetanus booster for prevention (Tdap/Td) — paid at $0 since Jan 1, 2023.
• Often NOT covered at all: a routine, no-injury booster if you have no Part D plan.

What you'll pay in 2026

Your cost depends entirely on which part of Medicare covers the shot.

• Routine Tdap/Td under Part D: $0 — no copay and no deductible, as long as the vaccine is on your plan and given by an in-network pharmacy or provider.
• Injury-related shot under Part B: you pay 20% coinsurance of the Medicare-approved amount, after you meet the Part B annual deductible, which is $283 in 2026. Medicare then pays the other 80%.
• If you have no Part D plan and need a routine booster: you may pay the full retail price out of pocket, since neither Part B nor a (nonexistent) Part D plan would cover it.
• For reference, the 2026 standard Part B monthly premium is $202.90; this premium applies whether or not you ever use the injury-related benefit.

Medicare Advantage plans and where to get your shot

Medicare Advantage (Part C) plans must cover at least everything Original Medicare covers. If your Medicare Advantage plan includes drug coverage (an MA-PD plan), it covers ACIP-recommended adult vaccines like Tdap at $0 under the same Part D vaccine rules — just like a stand-alone Part D plan.

Coverage details, networks, and pharmacy rules still vary by plan, so confirm the specifics in your plan's Evidence of Coverage or by calling the number on your member ID card.

For a routine Tdap or Td booster, you can usually get the shot at a participating pharmacy or at your doctor's office; pharmacies are often the simplest route for the $0 Part D vaccine. For an injury-related shot, you'll typically receive it at the doctor's office, urgent care, or emergency room where your wound is being treated, and it is billed to Part B.

• Tdap: tetanus, diphtheria, and pertussis (whooping cough) — the typical adult booster.
• Td: tetanus and diphtheria only — sometimes used for boosters.
• DTaP: a childhood vaccine for young children, not the adult booster Medicare beneficiaries receive.