Who has to refer the patient for the dental exam to count?

The regulation does not name a required referral form, but CMS guidance and the coordination requirement both point to the same fact pattern: the transplant team, not the patient walking in cold, identifies the need and documents it. A transplant coordinator's referral, a note in the shared record, or a documented phone or fax exchange between the transplant program and the dental office is what establishes that this exam happened because of the transplant, not despite it.

What is the KX modifier and when does a transplant dental claim need it?

The KX modifier is a claim-line flag certifying that documentation exists proving the dental service is inextricably linked to a covered medical service. CMS finalized July 1, 2025, as the date the KX modifier and an ICD-10 diagnosis code both become mandatory on the dental claim form for this coverage. A transplant-linked claim filed after that date without both is filed wrong, regardless of how clearly the patient qualified.

What documentation does a dental office need before billing a transplant clearance?

Five pieces, in order: the referral or order from the transplant team, the dental exam findings documenting the infection or risk, a treatment plan that states the dental work in terms of the transplant date, a clearance note sent back to the transplant team, and the KX modifier with ICD-10 code on the claim itself. Missing any one of the first four does not just weaken the claim. It removes the coordination the rule requires.

Does the ICD-10 code go on the dental diagnosis or the medical one?

The medical one. CMS requires the ICD-10 code on the 837D or 2024 ADA claim form to reflect the covered medical condition, the transplant, not the dental diagnosis alone. A code for the extraction or the periodontal finding by itself does not establish the link. The code has to point back to the reason the transplant team asked for the exam.

The Transplant Clearance Workflow. Referral to Remittance, Step by Step.

Q: Does Medicare pay for dental work before an organ transplant?

Yes, for the medically necessary portion. 42 CFR 411.15(i)(3)(A) covers a dental or oral exam performed as part of a comprehensive workup prior to, and treatment to eliminate an oral or dental infection prior to or contemporaneously with, an organ transplant, hematopoietic stem cell transplant, or bone marrow transplant. The routine or cosmetic portion of the visit stays dental. The infection-clearance portion is the part that can move to the medical side.

A transplant coordinator does not ask a patient to see a dentist because it would be nice. An active dental infection in an immunosuppressed transplant recipient is a real risk, and every transplant program in the country builds a dental clearance into the pre-transplant workup as a matter of course.

That exam happens. The infection gets treated. The clearance letter goes back to the transplant team. And in most practices, none of it gets billed to Medicare, because the clinical workflow and the billable workflow are not the same thing, and nobody built the second one on top of the first.

They can be the same workflow. Here is what that looks like, referral to remittance.

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

The regulation

42 CFR 411.15(i)(3)(A) covers a 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, an organ transplant, hematopoietic stem cell transplant, bone marrow transplant, cardiac valve replacement, valvuloplasty procedure, chemotherapy, CAR-T cell therapy, or administration of high-dose bone-modifying agents, when those are Medicare-covered services.

Source: 42 CFR 411.15(i)(3)(A), as codified under CMS-1770-F (CY 2023 Physician Fee Schedule final rule)

Notice how much is bundled into subparagraph (A). Transplant is the case most practices already know, but the same subparagraph covers cardiac valve work and several cancer-treatment scenarios. If a patient’s chart names any of these, the same clearance logic applies. The rest of this piece uses transplant as the working example, but the workflow is identical for the other conditions named in (A).

What is the six-step workflow, in order?

Step one, the trigger. The transplant team identifies the patient as a candidate, usually at listing or shortly before a scheduled living-donor date. This is the moment the dental referral should be generated, not the moment the patient happens to mention it.

Step two, the referral. A written referral, an EHR order, or a documented exchange, fax or phone call logged in both records, from the transplant program to the dental office. State the transplant date if one is set and the reason for the referral in the same sentence: infection clearance prior to transplant.

Step three, the dental exam. Document findings in terms a reviewer outside dentistry can follow. Not just “periapical abscess, #14” but “periapical abscess, #14, active infection requiring extraction prior to scheduled kidney transplant.”

Step four, the treatment plan. Link each planned service to the transplant explicitly. This is the sentence that carries the claim: what is being done, and why it has to happen before the transplant date rather than on routine dental time.

Step five, the clearance note. Send it back to the transplant team, and keep a copy. “Patient has been cleared for transplant from a dental standpoint, all active infections resolved” closes the coordination loop the regulation requires.

Step six, the claim. File the 837D with the CDT codes for the work performed, the ICD-10 code for the transplant-related condition, the KX modifier on every qualifying line, and the referring provider’s NPI.

Why does the referral direction matter this much?

Because the regulation’s coordination requirement is not a formality. If a patient shows up at a dental office on their own and mentions they are on a transplant list, and the dentist treats an infection with no referral, no documented exchange, and no clearance note back to the transplant team, there is no established inextricable link. Same clinical need, same infection, same treatment. Not the same claim.

The coordination test

CMS guidance states that where there is no exchange of information or integration between the medical professional handling the primary medical service and the dentist providing the dental service, there is not an inextricable link between the two under 42 CFR 411.15(i)(3). Coordination is not paperwork attached to the claim. It is the fact the claim is trying to prove.

Source: CMS, Medicare Dental Coverage, cms.gov/medicare/coverage/dental

The practical fix is structural, not heroic. A standing relationship with the transplant programs in your referral radius, a habit of asking every new implant or extraction consult whether the patient is on a transplant list, and a template clearance note that states the link in the transplant team’s own terms.

What does the claim itself need to carry?

Field	Requirement	Effective date
Referral or documented exchange	Transplant team to dental office, written or logged	Ongoing, per coordination requirement
ICD-10 code	Required on 837D / 2024 ADA claim form, must reflect the transplant-related condition	July 1, 2025
KX modifier	Required on every qualifying dental service line	July 1, 2025
Referring provider NPI	Must match the transplant team provider who ordered the exam	Ongoing
Clearance note	Sent to transplant team, retained in both records	Ongoing, per coordination requirement

Before July 1, 2025, CMS allowed claims in this lane without the KX modifier or ICD-10 code while it built out testing and provider education. That grace period is over. A transplant-linked claim filed today without both is incomplete on its face.

What does a practice actually lose by skipping this?

Not a hypothetical. A pre-transplant clearance exam and infection clearance is standard of care at essentially every transplant center. The service already happens on a defined clinical schedule tied to a real medical event. The only variable is whether the five pieces of documentation exist and whether the claim gets filed with them. A practice that runs transplant-adjacent patients and only bills the dental rate is not avoiding risk. It is leaving a claim on the table that its own chart already supports.

Where this comes from

The regulatory text is drawn from 42 CFR 411.15(i)(3)(A), codified in the CY 2023 Physician Fee Schedule final rule (CMS-1770-F). The KX modifier and ICD-10 requirement dates, and the coordination standard, are drawn from the CMS Medicare Dental Coverage page at cms.gov/medicare/coverage/dental, opened directly for this piece. The documentation sequence reflects the standard pre-transplant dental clearance workflow used across transplant programs.

Mapping a patient’s chart to this workflow, assembling the coordination documentation, and filing the claim correctly is what we do, on a contingency. No recovery, no fee.

Get your 12-Month Missing Money Scan. It runs this workflow against your last twelve months and tells you which transplant-adjacent cases had a medical claim hiding in a dental chart.