Does Medicare Pay for a Dental Clearance Before a Transplant? Yes, and It Is Standard of Care First, a Coverage Rule Second.

Short answer: yes. Medicare covers a dental or oral exam and treatment to eliminate infection before an organ transplant, a stem cell transplant, or a bone marrow transplant. That is written into 42 CFR 411.15(i)(3)(A), in force since January 1, 2023. What makes this exception different from most of the others in the same regulation is that transplant centers were already requiring this dental clearance before the rule existed. Medicare caught up to standard clinical practice, it did not invent a new requirement.

Transplant medicine has treated the mouth as part of the transplant workup for a long time. A patient headed into a transplant will often be on immunosuppressing medication, and an untreated dental infection is a real risk of sepsis or graft complications once the immune system is suppressed. Most transplant programs will not schedule a transplant until a dental clearance is on file. What changed on January 1, 2023 is that Medicare Part B started paying for that clearance exam and the infection treatment behind it, when the transplant is one Medicare already covers.

Transplant type	What Medicare can pay for under (A)	In force since
Organ transplant	Dental exam and infection treatment before or at the same time as the transplant	January 1, 2023
Hematopoietic stem cell transplant	Same exam and infection treatment	January 1, 2023
Bone marrow transplant	Same exam and infection treatment	January 1, 2023
Cardiac valve replacement or valvuloplasty	Same exam and infection treatment, named in the same subparagraph	January 1, 2023

What does 42 CFR 411.15(i)(3)(A) actually say?

The subparagraph reads: dental or oral examination performed as part of a comprehensive workup prior to, and medically necessary diagnostic and treatment services to eliminate an oral or dental infection prior to, or contemporaneously with, the following Medicare-covered services: organ transplant, hematopoietic stem cell transplant, bone marrow transplant, cardiac valve replacement, valvuloplasty procedures, chemotherapy when used in the treatment of cancer, chimeric antigen receptor (CAR) T-cell therapy when used in the treatment of cancer, and administration of high-dose bone-modifying agents (antiresorptive therapy) when used in the treatment of cancer.

Notice that the transplant language and the cardiac valve language sit in the same subparagraph as the cancer treatment language. That is not a coincidence in how the rule reads, it is one list of Medicare-covered procedures that all carry the same clinical logic: infection in the mouth is a real risk to a procedure elsewhere in the body, and clearing it first is part of the medical treatment, not a separate dental errand.

Why do transplant centers require a dental clearance before transplant?

An infected tooth or gum is a source of bacteria circulating in the bloodstream. For most people that is a manageable background risk. For someone about to receive an organ, a stem cell graft, or a bone marrow graft, and who will be on immunosuppressing medication afterward, that same infection can turn into sepsis, delayed healing, or a lost graft. Transplant teams have required a dental workup before listing or before transplant for years as part of routine pre-transplant protocol, independent of what Medicare paid for. The Medicare rule did not create the clinical requirement. It created a way to pay for the exam and the infection treatment the transplant team was already asking for.

What is not covered under this exception?

The coverage is specific to the exam and the infection-elimination treatment tied to the transplant, not general dental care:

• A routine cleaning or a cosmetic procedure done at the same visit is still excluded, unless it is the infection treatment the transplant team asked for.
• Dental work done long after the transplant, with no connection documented to the transplant workup, is treated as ordinary dental care.
• Restorative work, crowns, bridges, or dentures, to address teeth lost as a side effect of transplant medications, is not named in this subparagraph.

What has to be documented for the claim to be paid?

Three things matter for these claims specifically.

A referral connecting the transplant team to the dentist. Medicare wants to see documented coordination, a note from the transplant center asking for dental clearance, and a note from the dentist tying the exam and any treatment to that request. Most transplant centers generate this referral as a routine part of the pre-transplant workup, so it is often already in the chart, ask for a copy.

The KX modifier and a diagnosis code. Since July 1, 2025, the dental claim must carry the KX modifier, certifying that documentation supports the link to the transplant, and an ICD-10 diagnosis code on the dental claim form. Between January 1, 2025 and June 30, 2025 the modifier was optional. A claim filed today without it is filed wrong, regardless of whether the visit qualified.

Medicare enrollment. The dentist has to be enrolled in Medicare to bill and be paid for the exam. Ask before the workup if possible, since not every dentist who does pre-transplant clearances is enrolled.

What do I do if the claim was denied?

Start with the referral. If the Medicare Summary Notice shows the dental clearance denied with no mention of the transplant, the claim likely went in without the documented link, the KX modifier, or the diagnosis code. Ask the transplant center for the referral note and the dental office whether the claim was billed with the KX modifier. Under Original Medicare, the deadline to file a redetermination is 120 days from the date on the Medicare Summary Notice. Under a Medicare Advantage plan, check the denial notice for the specific deadline, it can be different. In the appeal, name subparagraph (A) directly and attach the transplant referral.

Does Medicare Advantage cover this too?

Yes. A Medicare Advantage plan must cover at least what Original Medicare covers, so the pre-transplant dental exception applies under an Advantage plan the same as under Original Medicare. A separate extra dental benefit some Advantage plans offer, with its own network and annual limit, is a different thing and cannot be used as the reason to deny a claim that falls under subparagraph (A).

A note on who we are

CheckMyDenial helps patients read and appeal insurance denials. We are related to a company that does medical-dental billing and reimbursement for patients and practices, and if you ever move from reading to having someone handle a claim for you, that relationship and any fee are disclosed before anything is paid. This page is free, it does not require anything from you, and it will stay that way.

Where this comes from

The subparagraph text above is quoted from 42 CFR 411.15(i)(3)(A), as published on the Cornell Legal Information Institute, which mirrors the current eCFR text. The KX modifier and ICD-10 dates come from the CMS Medicare Dental Coverage page. The exception itself was created by the CY 2023 Physician Fee Schedule final rule (CMS-1770-F), effective January 1, 2023. The appeal deadline is from the Medicare.gov appeals page. Links are listed at the end of this page. If you find something here that is out of date, tell us and we will fix it and change the date at the top.