Surgical · Other

Impression and custom fabrication of an oral surgical splint used to support facial structures during orthognathic or jaw reconstruction surgery.

Verified May 8, 2026 · 7 sources ↓

Medicare: $710.10
Total RVUs: 21.26
Global, days: 10
Region: Other

Drawn from CMSCgsmedicareDentalsleeppracticeAAPC

Documentation requirements

What must appear in the operative or office note to support the claim.

Source · Editorial brief grounded in 7 cited references ↓

Diagnosis supporting orthognathic reconstruction or mandibular/jaw surgery (e.g., post-trauma, post-ablative, orthognathic correction)
Explicit statement that impressions were taken and the splint was custom-fabricated in-office by the treating provider
Description of the surgical or clinical indication requiring a splint rather than a prefabricated or non-surgical device
Operative or procedure note confirming the splint is not a TMJ orthotic, sleep appliance, or morning repositioner
Provider credentials confirming scope-of-practice authority to perform oral surgical splint fabrication under applicable state law

Applicable modifiers

Modifiers commonly billed with this code.

Source · AMA CPT modifier descriptors · CMS NCCI Policy Manual

22 Increased complexity 52 Reduced services 59 Distinct service 76 Repeat, same physician 77 Repeat, another physician 79 Unrelated during global LT Left side RT Right side

What this code covers

Source · Editorial summary grounded in 7 cited references ↓

CPT 21085 covers the clinician's work in taking a facial impression and constructing a custom oral surgical splint in-office to support the patient's jaw and facial structures. It applies in orthognathic reconstruction cases — surgical repositioning of the jaws — and in situations where the mandible has been removed or significantly altered due to trauma or ablative surgery. The splint must be custom-fabricated from impressions taken by the treating provider; outsourcing fabrication to an outside lab without direct provider involvement is an audit red flag.

This code sits in the 21076–21089 prosthesis impression and custom preparation family. Billing it requires clear documentation that the splint is a true oral surgical appliance — not a TMJ orthotic, sleep device, or morning repositioner. Misapplication to dental sleep medicine devices is one of the most-cited misuse patterns for this code. The 010-day global period means minor post-delivery adjustments within 10 days are bundled; a separate E/M or adjustment visit inside that window needs modifier 24 or 25 to be payable.

Top billing specialties are oral surgery, general dentistry, and maxillofacial surgery. Orthopedic coders encounter this code in craniomaxillofacial trauma or tumor reconstruction contexts. Confirm payer coverage policy before submitting to commercial carriers — coverage for custom oral surgical splints varies widely, and some payers require prior authorization or a specific diagnosis (orthognathic or post-ablative) to process the claim.

RVU & reimbursement

Component RVUs and Medicare national rate. Actual payment varies by GPCI locality.

Source · CMS Physician Fee Schedule, RVU26A · January 2026

Work RVU	8.77
Practice expense RVU	11.42
Malpractice RVU	1.07
Total RVU	21.26
Medicare national rate	$710.10
Global period	10 days

Payment by site of service

Medicare pays different rates by setting. HOPD typically pays substantially more than ASC for the same procedure.

Source · CMS OPPS Addendum B·ASC HCPCS payment rates·2026

Setting	Medicare rate (national)
Office (PFS non-facility) Procedure performed in physician's office	$710.10
HOPD (APC 5161) Hospital outpatient department	$241.98
ASC (PI P2) Ambulatory surgical center (freestanding)	$129.50

Common denial reasons

The recurring reasons claims for CPT 21085 get rejected.

Source · Editorial brief grounded in CMS NCCI edits, AAOS coding appeals, and cited references ↓

Device billed as a dental sleep appliance or TMJ orthotic rather than a true oral surgical splint, triggering medical necessity denial
Fabrication outsourced to an external dental lab without adequate documentation of direct provider involvement in impression-taking and preparation
Missing or insufficient diagnosis linking the splint to orthognathic reconstruction or post-ablative/trauma jaw surgery
Claim submitted outside payer coverage policy — many commercial payers require prior authorization or limit coverage to specific post-surgical indications
Bundling conflict when billed same-day with a related surgical procedure without a clinically appropriate modifier to separate distinct services

Frequently asked questions

Source · Generated from the editorial pipeline, verified against 7 cited references ↓

01Can 21085 be used for a dental sleep apnea device or TMJ orthotic?

No. CPT 21085 is specifically for oral surgical splints supporting jaw reconstruction or post-ablative surgery. Billing it for sleep appliances or TMJ devices is a documented misuse pattern and a known audit trigger. Sleep devices bill under E0485 or E0486 depending on whether the device is prefabricated or custom.

02Does the splint have to be fabricated in-office?

Yes, per established coding guidance, the impression and custom preparation must be performed by the treating provider. Outsourcing fabrication entirely to an outside lab — without direct provider involvement in the impression and preparation — undermines the code's clinical basis and creates audit exposure.

03What global period applies to 21085, and what does it cover?

The global period is 010 days. That window includes the procedure day and routine post-delivery care through day 10. Minor splint adjustments or follow-up within that window are bundled. Bill modifier 24 or 25 on a separate E/M if you're addressing an unrelated problem during that period.

04Which ICD-10 codes support medical necessity for 21085?

Strong supporting diagnoses include orthognathic deformity codes (e.g., M26.x series), post-traumatic jaw deformity, mandibular fracture sequelae, and post-ablative jaw reconstruction. Payers will scrutinize claims lacking a surgical-level jaw diagnosis — a diagnosis pointing to a dental or TMJ problem alone is unlikely to support payment.

05Can 21085 be billed same-day with a jaw surgical procedure?

It depends on the payer and the NCCI edit status of the pairing. If the splint fabrication represents a distinct service separate from the surgical procedure (e.g., performed at a separate pre-op encounter), modifier 59 or XS may apply. Check the NCCI PTP lookup for the specific code pair before billing. Don't assume separation is allowed without verifying modifier indicator status.

06Is prior authorization required for 21085?

Medicare does not mandate prior authorization for 21085, but commercial payer policies vary widely. Some carriers require pre-authorization and a letter of medical necessity for custom oral surgical appliances. Verify each payer's policy before scheduling the fabrication — after-the-fact denials on this code are difficult to overturn without pre-auth documentation.

Sources & references

Editorial content was developed using the following public sources. Last verified May 8, 2026.

Mira AI Scribe

Mira's AI scribe captures the clinical indication (orthognathic reconstruction, mandibular resection, post-trauma jaw surgery), confirms that impressions were taken and the splint was custom-fabricated in-office by the treating provider, and flags the device type explicitly as an oral surgical splint — not a TMJ orthotic or sleep appliance. That specificity prevents the most common denial pattern for 21085: device misclassification by payer reviewers.

See how Mira captures CPT 21085 documentation