Surgical · Other

Application of an interdental fixation device for conditions other than fracture or dislocation, including subsequent removal.

Verified May 8, 2026 · 7 sources ↓

Medicare: $872.77
Total RVUs: 26.13
Global, days: 90
Region: Other

Drawn from CMSAaomsAAPCPayerpriceEmedny

Documentation requirements

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

Source · Editorial brief grounded in 7 cited references ↓

Diagnosis must specify a non-fracture, non-dislocation condition (e.g., orthognathic repositioning, OSA-related MMA) — fracture fixation uses separate codes
Operative note must name the fixation device type (arch bars, interdental wiring, splint) and placement technique
Document that removal is included or anticipated; do not create a separate removal charge without supporting documentation of a distinct encounter
Medical necessity narrative linking the fixation device to the underlying diagnosis (e.g., obstructive sleep apnea, jaw malalignment)
For OSA-related cases, include preoperative diagnosis documentation and any relevant sleep study or prior authorization confirming medical insurance coverage

Applicable modifiers

Modifiers commonly billed with this code.

Source · AMA CPT modifier descriptors · CMS NCCI Policy Manual

22 Increased complexity 51 Multiple procedures 52 Reduced services 58 Staged or related 59 Distinct service 76 Repeat, same physician 77 Repeat, another physician 78 Unplanned return — related 79 Unrelated during global 24 Unrelated E/M during global 25 Significant separate E/M

What this code covers

Source · Editorial summary grounded in 7 cited references ↓

CPT 21110 covers placement of an interdental fixation device — typically arch bars, wires, or similar stabilization hardware — used in non-fracture, non-dislocation settings. The most common clinical context is maxillomandibular advancement (MMA) surgery for obstructive sleep apnea or orthognathic jaw repositioning, where upper and lower arch bars are secured to maintain jaw alignment during healing. Removal is bundled into the code; do not bill a separate removal code.

The 90-day global period means all routine post-op management through day 90 is included. If you need to bill an unrelated visit during that window, append modifier 24. A staged or planned subsequent procedure in the global period takes modifier 58. The code sits within the musculoskeletal system surgery section and is billed as a medical CPT code — AAOMS explicitly recommends using CPT rather than CDT codes (e.g., D7998) when the case is likely covered under medical insurance, including sleep apnea and orthognathic indications.

Top billing specialties are oral and maxillofacial surgery and dental surgery. Orthopedic and general surgery coders encounter this code primarily in trauma or craniofacial contexts. Payer coverage policies for OSA-related indications vary — confirm each commercial carrier's criteria before submitting, as some plans limit coverage to fracture or post-surgical indications only.

RVU & reimbursement

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

Source · CMS Physician Fee Schedule, RVU26A · January 2026

Work RVU	5.84
Practice expense RVU	19.58
Malpractice RVU	0.71
Total RVU	26.13
Medicare national rate	$872.77
Global period	90 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	$872.77
HOPD (APC 5163) Hospital outpatient department	$1,585.19
ASC (PI P3) Ambulatory surgical center (freestanding)	$657.59

Common denial reasons

The recurring reasons claims for CPT 21110 get rejected.

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

Billed under dental insurance using CDT code D7998 when the case qualifies as a medical procedure under CPT 21110 — claim routes to wrong payer
Missing or inadequate medical necessity documentation for non-fracture indications; payers default to fracture-only coverage without explicit diagnosis support
Unbundling: separately billing a removal procedure that is already included in 21110
Global period conflict: billing a related E/M or procedure within the 90-day global without the required modifier 24, 25, or 58
Incorrect place of service — procedure performed in the OR but billed with an office POS code, triggering site-of-service payment discrepancy

Frequently asked questions

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

01Is removal billed separately from CPT 21110?

No. Removal is bundled into 21110. Do not submit a separate code for device removal — doing so is an unbundling error and will be denied or recouped on audit.

02When should CDT code D7998 be used instead of CPT 21110?

Use D7998 only when billing to dental insurance for a procedure that does not qualify for medical coverage. AAOMS recommends CPT 21110 for OSA and orthognathic cases because those conditions are typically covered under medical insurance, not dental. Submitting D7998 to a medical payer will route to the wrong adjudication pathway.

03What modifiers apply when 21110 is billed same-day with another maxillofacial procedure?

Use modifier 51 on the lower-RVU secondary procedure to signal multiple procedures in the same session. If the procedures are distinct and NCCI edits create a bundling conflict, modifier 59 supports separate reimbursement with appropriate documentation.

04Does the 90-day global period apply, and what can be billed within it?

Yes, 21110 carries a 90-day global. Routine post-op visits are included. Bill unrelated E/M visits with modifier 24, a separately identifiable E/M on the day of surgery with modifier 25, and a planned staged procedure within the global with modifier 58.

05Is CPT 21110 appropriate for OSA patients receiving maxillomandibular advancement?

Yes. AAOMS guidance specifically identifies 21110 for the arch bar placement component of MMA surgery. Confirm the payer's coverage policy for OSA-related surgical indications before submitting — some commercial plans restrict coverage or require prior authorization for OSA surgical procedures.

06Can modifier 22 be appended if the fixation was unusually complex?

Yes, but the operative note must document the specific factors that increased complexity — unusual anatomy, prolonged fixation time, or significant deviation from standard technique. Modifier 22 without supporting narrative is a common audit flag.

Sources & references

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

Mira AI Scribe

The Mira AI Scribe captures the fixation device type (arch bars, interdental wires), the specific jaw segments stabilized, the clinical indication (OSA, orthognathic repositioning, or other non-fracture diagnosis), and confirmation that removal is anticipated as part of the same episode of care. This prevents the most common audit flag — an operative note that documents only 'jaw stabilization' without specifying the device or distinguishing the indication from fracture care, which triggers payer scrutiny and medical necessity denials.

See how Mira captures CPT 21110 documentation