> ## Documentation Index
> Fetch the complete documentation index at: https://dso.getlemma.com/llms.txt
> Use this file to discover all available pages before exploring further.
# Bill medical plans for dental work
> Set up medical-dental crossover billing: which procedures qualify, the enrollment and documentation it requires, how the claims travel, and how to decide which plan pays first.
To bill a patient's **medical** insurance for dental-adjacent care, you need medical-payer enrollment, CPT/ICD-10 coding capability, and medical-necessity documentation. A dental office may not have these capabilities in place. A careful crossover workflow can reach benefits outside the dental plan's annual maximum, while an improvised one creates denials and duplicate-billing risk. This work is often easier to manage through a centralized DSO team.
## 1. Know which work crosses over
The recognized buckets:1
| Bucket | Examples |
| ---------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| **Trauma** | Repair of injuries to teeth, jaws, and soft tissue from accidents |
| **Oral and maxillofacial surgery** | Impacted third molars with medical indications, jaw surgery, infections with systemic involvement |
| **Sleep apnea appliances** | Custom oral appliances for diagnosed obstructive sleep apnea, treated as DME under medical plans and Medicare |
| **TMJ and orofacial pain** | Appliance therapy and treatment, per each medical plan's TMJ policy; state coverage mandates vary |
| **Pathology** | Biopsies of oral lesions and related diagnostics |
| **Medically necessary clearance** | Exams, extractions, and infection elimination before head-and-neck radiation, organ transplant, cardiac valve procedures, and certain cancer therapies. Traditional Medicare now pays for specified services in these scenarios under 42 C.F.R. § 411.15(i)(3).2 |
## 2. Build the enrollment and coding capability once, centrally
Crossover claims go to the patient's medical plan, so the dentist, often an oral surgeon or a general dentist providing sleep medicine, needs the appropriate medical enrollment or network participation. This credentialing track is separate from [dental payer enrollment](/guides/enrollment/enroll-with-dental-payers).
For sleep appliances billed to Medicare, the supplier needs **DMEPOS enrollment**; for medically necessary dental under the 2023 rule, Part B enrollment. See [Enroll in Medicare](/guides/enrollment/enroll-in-medicare).
Medical claims use the **837P/CMS-1500 with CPT/HCPCS and ICD-10-CM**, rather than the 837D with CDT. Assign responsibility for the code crosswalk, often to a centralized biller. The dental PMS may need a medical-billing module or a parallel clearinghouse path.3
## 3. Document like a medical claim, because it is one
Medical payers generally require clinical notes establishing **medical necessity**, ICD-10 diagnoses, narratives or operative reports, and imaging. For sleep appliances, they may also require a sleep-study-documented OSA diagnosis and a physician's order.3 Prior authorization is common; obtain it through the medical plan's process. See [Get prior authorizations](/guides/billing/get-predeterminations).
## 4. Determine which plan pays first
There is no universal primacy rule; the plan documents control. A dental plan may exclude services covered under a medical plan, effectively making medical primary for crossover services. Some medical policies require the dental plan to adjudicate first and then coordinate the remaining balance. A single visit can also split, with TMJ treatment submitted to medical and a routine extraction submitted to dental.4
Look first to the medical plan's policies for oral surgery, TMJ treatment, and DME, along with each plan's COB provision. The Summary of Benefits often says little about dental crossover. Confirm the answer through a policy lookup and predetermination. Submit the same procedure to both plans only as a proper primary-and-secondary COB sequence with the primary plan's adjudication attached.
## Verify it worked
* [ ] Crossover procedure list defined and trained, showing what routes to medical and what stays dental
* [ ] Medical-payer and (where relevant) DMEPOS/Part B enrollments in place before the first crossover claim
* [ ] Cross-coding crosswalk owned centrally, reviewed at each annual code update
* [ ] Sleep cases carry the sleep study and physician order before appliance delivery
* [ ] COB sequence documented per plan; no procedure billed to both plans outside COB
## Sources
1. Delta Dental, [Is oral surgery covered by medical or dental insurance?](https://www.deltadental.com/protect-my-smile/dental-insurance-101/is-oral-surgery-covered-by-medical-or-dental-insurance/); Nierman Practice Management, [cross-coding dental to medical](https://niermanpm.com/blog/cross-code-dental-to-medical/).
2. CY 2023 Medicare Physician Fee Schedule final rule, 87 Fed. Reg. 69404, codified at 42 C.F.R. § 411.15(i)(3). [CMS fact sheet](https://www.cms.gov/newsroom/fact-sheets/calendar-year-cy-2023-medicare-physician-fee-schedule-final-rule); CMS, [Medicare dental coverage](https://www.cms.gov/medicare/coverage/dental).
3. Nierman Practice Management, [medical billing for dentists: sleep apnea](https://niermanpm.com/blog/medical-billing-for-dentists-sleep-apnea/); Glidewell, [how to bill medical insurance for dental sleep medicine](https://glidewelldental.com/company/blog/how-to-bill-medical-insurance-for-dental-sleep-medicine-cases); Outsource Strategies, [medical-dental cross-coding](https://www.outsourcestrategies.com/blog/medical-dental-cross-coding-dental-practices/).
4. Delta Dental COB explainer (n.1); Aspect Billing Solutions, [medical billing for dental procedures](https://www.aspectbillingsolutions.com/medical-billing-for-dental-procedures-sleep-apnea-tmj-more/).