MEDIA

Dental Billing Is Changing: What Practices Need to Know About Medicare, ICD-10 and the Growing Medical-Dental Billing Crossover

Research-Based Resource | Approximately 10-minute read

For decades, most dental practices have operated within a familiar reimbursement system. A procedure is performed. The appropriate CDT code is selected. A dental claim is submitted. The dental benefit plan processes the claim.

But the line separating dental billing from medical billing is becoming less distinct in certain situations.

Recent Medicare policy changes have expanded circumstances in which dental services may be payable when they are directly connected to the success of covered medical treatment. Those claims can introduce requirements that may be unfamiliar to a dental office accustomed primarily to traditional dental-benefit billing—including ICD-10 diagnosis coding, medical necessity documentation, care coordination with medical providers, Medicare enrollment and specific claim modifiers.

At the same time, dental coding continues to evolve, and a new federal electronic claims-attachment standard will change how HIPAA-covered providers and payers exchange documentation such as X-rays, clinical records and supporting notes. None of this means that every dental procedure will suddenly be billed as a medical claim.

It does mean that dental practices should understand how the reimbursement environment is changing—and where dental and medical billing increasingly intersect.

First, What Is Actually Changing?

Traditional Medicare generally does not cover routine dental services simply because a patient has Medicare.

Routine services such as ordinary dental care, fillings, replacement of teeth and other services that fall within Medicare's statutory dental exclusion remain generally excluded.

However, Medicare Parts A and B can pay for certain dental services when those services are considered "inextricably linked" to the clinical success of another Medicare-covered medical service. (CMS)

That distinction is important.

Medicare is not becoming a traditional dental insurance plan.

Instead, CMS recognizes that in certain medical situations, addressing a patient's oral or dental condition may be medically necessary for the covered medical treatment to succeed.

For dental practices treating these patients, that creates an entirely different billing conversation.

What Does "Inextricably Linked" Mean?

Consider a patient preparing for an organ transplant.

An active oral infection can create serious complications for an immunocompromised transplant patient. If dental evaluation and treatment are necessary to eliminate that infection so the covered transplant can proceed successfully, Medicare may cover qualifying dental services related to that medical treatment.

CMS currently identifies circumstances that can include dental or oral examinations and certain medically necessary dental treatment connected with:

Organ transplants, including bone marrow and hematopoietic stem-cell transplantation

Cardiac valve replacement

Valvuloplasty

Certain cancer treatment, including chemotherapy and CAR T-cell therapy

High-dose antiresorptive therapy used in cancer treatment

Treatment of head and neck cancer

Certain dialysis services for end-stage renal disease

Dental ridge reconstruction performed in connection with tumor removal

Stabilization of teeth in connection with treatment of a jaw fracture

Certain dental splints used as part of covered treatment for a medical condition

The specific facts of the patient's case and relationship between the dental and covered medical treatment still matter. (CMS)

This is not blanket Medicare dental coverage.

For example, if Medicare recognizes extraction of an infected tooth as necessary before a covered medical procedure, that does not automatically mean Medicare will also pay for an implant or crown afterward merely because those services relate to the same tooth. CMS makes clear that services must meet the requirements for the applicable medical-dental connection. (CMS)

That is exactly why understanding the billing distinction matters.

The Dental Claim May Now Require Information Dental Teams Are Less Accustomed to Using

This is where the change becomes especially significant for dental practices.

Beginning July 1, 2025, CMS requires dental services identified as inextricably linked to covered medical services to use the KX modifier. CMS also requires an ICD-10 diagnosis code on the dental 837D or 2024 ADA dental claim form for applicable Medicare claims beginning July 1, 2025. (CMS)

For a dental office accustomed primarily to CDT procedure coding, that introduces a different layer of knowledge.

CDT answers one question:

What dental procedure was performed?

ICD-10 answers another:

What diagnosis or medical condition helps explain why the service was medically necessary?

Those are not interchangeable.

And once both dental procedures and medical diagnoses become relevant to reimbursement, successful claim preparation may require an understanding of information that traditionally sits on both sides of the medical-dental divide.

What Is the KX Modifier?

The KX modifier is another important part of this process.

CMS uses the KX modifier for qualifying dental claims to indicate that the provider has documentation supporting the medical necessity of the service and its relationship to a Medicare-covered medical service.

Use of the modifier also represents that appropriate coordination occurred between the dental and medical practitioners.

Beginning July 1, 2025, CMS requires the KX modifier to identify qualifying dental services that are inextricably linked to covered medical services. (CMS)

That means simply determining that a patient "has Medicare" is nowhere near enough.

The dental practice may need to understand:

What medical treatment is the patient receiving?

Why is the dental service necessary for that treatment?

Has the relationship between the medical and dental services been documented?

Has appropriate communication occurred between the treating providers?

Does the claim contain the information necessary to demonstrate that relationship?

Those are revenue-cycle questions as much as they are clinical-documentation questions.

Care Coordination Is Not Optional in These Cases

One of the most important elements of Medicare's policy is the expectation of coordination between the dental practitioner and the practitioner managing the patient's covered medical condition.

CMS states that without documented evidence supporting the exchange of information or coordination between the medical and dental providers, Medicare will not cover and pay for dental services on the basis that they are inextricably linked. (CMS)

That coordination might include a physician referral, information exchanged between the medical and dental providers or other documentation showing that the dental treatment relates to the patient's covered medical care.

The patient's record therefore needs to tell a coherent story.

It should not merely show:

"Dental procedure performed."

It should support:

"This dental service was medically necessary because of its relationship to this covered medical treatment, and the providers involved coordinated that care."

For dental offices unfamiliar with medical-necessity documentation, this can represent a substantial change in workflow.

Medicare Enrollment Can Become Part of the Conversation

Another question dental practices may not traditionally have needed to consider is Medicare enrollment.

CMS states that a provider must generally be Medicare-enrolled to bill Medicare directly and receive payment for Medicare-covered dental services. Dentists who meet Medicare's enrollment requirements can enroll for this purpose. (CMS)

That does not mean every dentist in America is suddenly required to enroll in Medicare.

But a dental practice that treats patients whose dental care may qualify for Medicare payment should understand what enrollment status means for its ability to bill and receive reimbursement.

A practice may therefore need to evaluate whether opportunities exist within its patient population that it historically never considered billable to Medicare.

Medical and Dental Codes Can Exist in the Same Reimbursement Conversation

CMS instructs providers submitting covered dental claims to use the appropriate CDT or CPT codes, depending on the services and billing circumstances. (CMS)

That alone illustrates how much the billing environment is changing.

Dental staff traditionally live primarily in the world of CDT. Medical billing professionals routinely work with CPT, HCPCS and ICD-10.

Certain medical-dental crossover cases can bring those coding systems closer together.

That does not mean one code set replaces another.

It means the practice must know which coding and claim requirements apply to the particular service, payer and circumstances.

And inaccurate assumptions can have financial consequences.

There Is Another Major Change Coming: Electronic Claims Attachments

The medical-dental crossover is not the only reason dental practices should be watching claims administration.

In March 2026, CMS finalized the first HIPAA-adopted national standards for electronic health care claims attachments.

The rule addresses the exchange of supporting clinical documentation used to process claims.

That can include:

X-rays and other imaging

Clinical notes

Medical records

Laboratory results

And CDT Is Changing Too

Even while dental practices adjust to broader changes in reimbursement administration, the traditional dental coding environment continues to evolve. The American Dental Association has announced 67 changes to CDT 2027, including:

28 additions

33 revisions

Six editorial updates

The changes become effective January 1, 2027. (ADA News)

Among the changes are new or revised coding involving implant-related procedures, healing caps, fixed splints, interim dentures, resin-based composite crowns, orthodontic therapy, neuromodulators and orofacial pain-management procedures. (ADA News)

The ADA emphasizes a fundamental coding principle: providers should code according to the procedure actually performed, while recognizing that the existence of a CDT code does not itself guarantee that a particular benefit plan will cover or reimburse the service. (ADA News)

That distinction becomes increasingly important as dental practices interact with multiple types of coverage and more complicated reimbursement scenarios.

A Dental Practice Could Perform the Right Service and Still Struggle to Get Paid

This is perhaps the most important lesson in all of these changes. Clinical care and reimbursement are connected—but they are not the same process. A dentist may provide clinically appropriate care. The treatment may genuinely relate to a serious medical condition. But reimbursement can still be affected if the practice does not correctly:

Identify the appropriate payer.

Establish medical necessity.

Coordinate with the medical provider.

Document that coordination.

Use the appropriate diagnosis information.

Select the correct procedure codes.

Use required modifiers.

Submit the appropriate claim transaction.

Attach required supporting documentation.

Monitor whether the claim was accepted.

Respond to additional documentation requests.

Address denials or requests for information.

Coordinate secondary coverage appropriately.

The clinical service can be correct while the revenue-cycle process surrounding it is incomplete.

Consider This Example

Imagine a Medicare patient who is preparing for an organ transplant. During the required pre-transplant evaluation, an oral infection is identified. The patient's transplant team needs the infection addressed because it could compromise the success of the transplant. The dentist treats the infection.

Historically, a dental office might look at the patient's Medicare coverage and assume: "Medicare doesn't cover dental."

Under current Medicare policy, that assumption may be incomplete. Certain medically necessary dental services associated with the patient's transplant can potentially qualify for Medicare payment because of the direct relationship between treating the oral infection and the success of the covered medical service. (CMS)

But recognizing the opportunity is only the beginning.

The practice still has to navigate the documentation, coding, enrollment and claim-submission requirements necessary to support reimbursement. Without that knowledge, a potentially payable service could be written off, billed incorrectly or never submitted to the appropriate payer.

That Is Where Revenue Cycle Knowledge Becomes Especially Important

The expanding intersection of medicine and dentistry illustrates why billing should not be viewed simply as data entry.

Modern reimbursement increasingly depends on understanding:

Who should be billed.

Why the service is payable.

How medical necessity is demonstrated.

Which codes and modifiers apply.

What documentation is required.

What happens after the claim is submitted.

And sometimes, whether a service traditionally viewed as "dental" may have a medical reimbursement pathway that the practice has never considered.

For dental practices, that makes revenue-cycle education increasingly valuable.

What Should Dental Practices Be Doing Now?

Practices do not need to overhaul their entire billing operation because of these changes.

But they should begin asking the right questions.

Does our team understand when dental treatment may be connected to medical coverage?

Do we treat patients preparing for organ transplants, cardiac procedures, cancer treatment or dialysis?

If so, do we have a process for recognizing potentially qualifying cases?

Does our billing team understand ICD-10 diagnosis coding well enough to navigate medical-dental crossover situations?

Do we understand Medicare's KX modifier requirement?

Do we know what documentation is needed to demonstrate coordination with the patient's medical provider?

Are applicable providers properly enrolled when Medicare billing is appropriate? Can our software and clearinghouse support the required transactions?

Are we preparing for CDT 2027?

Have we spoken with our technology vendors about the 2028 electronic claims-attachment requirements?

Most importantly:

Are we certain that services we currently classify as "not billable" truly have no available reimbursement pathway?

That last question may be worth investigating.

Dental Billing Is No Longer Always Only Dental Billing

Traditional dental billing is not disappearing.

CDT codes, dental benefit plans and standard dental claims remain central to dental reimbursement.

But there are increasingly important situations where a practice may need to understand concepts that historically belonged more heavily to medical billing:

ICD-10 diagnosis coding.

Medical necessity.

CPT and HCPCS.

Modifiers.

Medicare enrollment.

Coordination with physicians.

Electronic claims standards.

Supporting medical documentation.

Coordination of benefits.

That crossover creates complexity.

But it can also create opportunity.

A dental practice that understands these changing reimbursement pathways may be better positioned to identify coverage options, submit claims appropriately, prevent avoidable denials and capture reimbursement that might otherwise be overlooked.

The takeaway is not that every dentist must become a medical biller.

It is that dental practices should know when dental expertise alone may no longer be enough to navigate the claim.

As reimbursement continues to evolve, understanding both sides of the medical-dental revenue cycle may become an increasingly important part of protecting practice revenue.

Key Dates for Dental Practices

July 1, 2025: CMS began requiring the KX modifier for qualifying dental services identified as inextricably linked to Medicare-covered medical services, and ICD-10 diagnosis information became required on applicable Medicare dental claims submitted using the 837D/ADA dental claim form. (CMS)

May 26, 2026: CMS's final rule establishing national HIPAA standards for electronic health care claims attachments became effective. (CMS)

January 1, 2027: CDT 2027, containing 67 coding changes, takes effect. (ADA News)

May 26, 2028: HIPAA-covered entities subject to the new electronic claims-attachment rule must comply with the finalized standards. (CMS)

Sources Consulted

Centers for Medicare & Medicaid Services, Medicare Dental Coverage

Centers for Medicare & Medicaid Services, Medicare Benefit Policy Manual — Dental Services Integral to Medicare-Covered Services

Centers for Medicare & Medicaid Services, Administrative Simplification: Adoption of Standards for Health Care Claims Attachments Transactions and Electronic Signatures Final Rule (CMS-0053-F)

Centers for Medicare & Medicaid Services, Billing and Coding: Dental Services

American Dental Association, CDT 2027 Code Updates

American Dental Association, Dental Coding Guidance

This resource is intended for general educational purposes and does not replace payer-specific billing guidance, coding advice, legal advice or Medicare coverage determinations for an individual patient or service.