Noridian JE's Dental Billing Article, Read Clause by Clause. What It Actually Requires and What It Only Encourages.

CMS writes the regulation. Noridian pays or denies your claim. For a practice in California, Hawaii, or Nevada, that second fact is the one that determines what actually happens to a filed claim, and Noridian publishes exactly what it is checking for on its own dental services page. Most practices have never opened it.

Who is Noridian, and why is a MAC’s own article the real operating document?

Noridian Healthcare Solutions is the Medicare Administrative Contractor, the MAC, for Jurisdiction E Part B, covering California, Hawaii, Nevada, American Samoa, Guam, and the Northern Mariana Islands. A MAC is a private contractor CMS pays to process, review, and adjudicate Medicare Part B claims within its jurisdiction. The federal regulation sets the coverage rule; the MAC’s own published article is where that rule gets translated into the specific submission requirements, code, form, and modifier expectations a claim in that jurisdiction actually has to meet.

That means Noridian’s dental article is not a third party’s interpretation of the rule. It is the primary operating document for any practice billing dental claims to Medicare Part B in this jurisdiction.

What does Noridian’s article say the base coverage rule is?

The article opens by restating the statutory exclusion plainly. Dental services, minus a few exceptions, are not a Medicare covered benefit, citing Social Security Act Section 1862(a)(12) and 42 CFR 411.15(i). That exclusion covers services connected to teeth and the periodontium, the supporting gum and bone structure, and it applies regardless of whether the excluded service is delivered in a hospital or outpatient setting.

Then it lays out the exception the rest of the article is built around. For dates of service January 1, 2023, and after, Medicare may pay for dental services that are inextricably linked and substantially related to the clinical success of a covered primary medical service, and the article states this list of qualifying scenarios explicitly includes, but is not limited to, the ones it names.

What does the diagnosis code requirement actually say?

Noridian’s article states that Medicare fee-for-service requires a minimum of one ICD-10 diagnosis code on any claim form seeking reimbursement for services. It specifically clarifies that this diagnosis does not have to reflect the covered primary medical condition; it may simply be a diagnosis reflective of the dental treatment itself. The article then states the enforcement point directly: claims received on or after July 1, 2025, will reject if not submitted with a valid ICD-10 diagnosis code. This is a submission mechanics requirement, separate from and in addition to the inextricably linked medical-necessity standard itself.

What does the KX modifier requirement say, and how did it change over time?

This is the clause practices most often miss, because the article describes a shift from encouraged to required rather than a single fixed rule.

Date	What the article states
July 1, 2024	Providers may report modifier KX on dental claims to expedite the MAC’s determination of inextricable linkage, if the provider is certain the documentation supports medical necessity and care coordination occurred. Encouraged, not required.
July 1, 2025	Claims will require the KX modifier, per line item, to indicate the provider believes the service is medically necessary, has supporting documentation in the record, and that coordination of care between medical and dental providers has occurred.
July 1, 2025 onward	Noridian may deny dental claims that do not contain modifier KX as statutorily non-covered.

A claim in the inextricably linked lane filed today without the KX modifier is filed against a requirement that has already gone from optional to enforced.

What does the article say about claim forms and ancillary services?

The article states claims may be submitted using the dental claim form, 837D, the institutional claim form, 837I, or the professional claim form, 837P, and that Medicare will accept either CDT codes or CPT/HCPCS codes when billed. It directs practices enrolling for 837D dental claims testing to the jurisdiction’s Electronic Data Interchange page.

On ancillary services, the article is direct: services furnished incident to a covered dental service, including anesthesia administration, diagnostic x-rays, and use of the operating room, are not carved out of coverage. It separately clarifies the boundary on the other side: an x-ray taken in connection with routine, non-covered dental or periodontal treatment is not itself covered. The distinction is not the x-ray; it is whether the underlying dental service it accompanies qualifies.

What does the article say about TMJ and oral appliances, and why does the distinction matter?

The article states that many TMJ treatment procedures fall within the statutory exclusion for services not demonstrated reasonable and necessary, and separately within the dental services exclusion for care connected to teeth and supporting structures. Because of that overlap, the article states a diagnosis of TMJ alone on a claim is insufficient; the actual underlying condition or symptom has to be documented. Oral appliances for obstructive sleep apnea are routed elsewhere entirely, to a Durable Medical Equipment jurisdiction’s own local coverage determination, not this dental article, which is a routing detail worth catching before a claim goes to the wrong desk.

What does the article name as its own authority?

The reference list at the bottom of Noridian’s article is worth reading on its own, because it shows the article is not the source of the rule, only the jurisdiction’s operating restatement of it. It cites Title XVIII of the Social Security Act, Sections 1862(a)(1)(A), 1862(a)(7), 1862(a)(12), and 1833(e), along with 42 CFR 411.15(a) and (i), 42 CFR 440.100, and 42 CFR 410.26. It also cites specific chapters of the CMS Internet-Only Manuals, including Chapter 4 of the Medicare General Information manual on hospital admission certification for dental services, Chapter 1 and Chapter 16 of the Medicare Benefit Policy Manual on dental services exclusions, and Chapter 3 of the Medicare Program Integrity Manual. A practice disputing a Noridian denial has a direct path back to the specific regulation and manual section behind it, because the article names them rather than leaving the citation to guesswork.

What does the article not say, and why does that matter?

The article does not publish a fee schedule figure or a specific reimbursement rate for any dental CDT or CPT code billed under the inextricably linked exception. It does not name every possible qualifying medical condition; it repeats the regulation’s own language that the list is not exhaustive, without offering further guidance on how a MAC reviewer decides a borderline case. And it does not walk through what documentation format satisfies the coordination-of-care requirement beyond stating that a referral or exchange of information is needed. Those gaps are not oversights in the article. They mark where the operating rule ends and clinical and administrative judgment, backed by the chart, has to begin.

Where this comes from

This article is a clause-by-clause reading of Noridian Healthcare Solutions’ own dental services page for Jurisdiction E Part B, published at med.noridianmedicare.com/web/jeb/specialties/dental and last updated by Noridian on June 11, 2025 per the page’s own footer. It cites 42 CFR 411.15(i), Title XVIII Section 1862(a)(12) of the Social Security Act, and the CY 2023 and CY 2024 Physician Fee Schedule final rules that the Noridian article itself names as its authority. No dollar amount, fee schedule figure, or reimbursement rate is stated here; the article does not publish one, and this piece does not invent one.

If you want to know how many of your own claims are missing the KX modifier or the diagnosis code Noridian now requires, ClaimRail runs a free audit against your own claims data. No fee, no pitch.