CPT 21100Surgery

Maxillofacial fixation

CPT 21100 covers the placement of wires or other devices to hold the upper and lower jaw together, typically after fractures or certain surgical procedures. This temporary fixation keeps the jaws in proper alignment during healing.

Showing rates for

National Average

Base Medicare rate

$605.20

This calculator gives a typical-case estimate using standard Medicare modifier rules. Actual payment depends on payer policies, documentation, code-specific CMS status indicators, and locality. Verify before billing.

RVU breakdown

Work RVU

4.73

PE RVU (NF)

13.5

MP RVU

0.48

Total RVU

18.71

Conversion factor: 32.3465 · Source: CMS MPFS RVU25A · Confidence: High

NCCI bundling edits

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Billing tips

Verify place of service accurately to capture the $249.71 difference between non-facility and facility rates
Impact: Incorrect POS coding can result in $249.71 underpayment or trigger audit flags for overpayment
Document whether fixation is performed as a standalone procedure or bundled with fracture repair codes (21310-21497)
Impact: Unbundling when fixation is integral to fracture repair results in 100% denial of the 21100 claim
Bill separately from open reduction procedures only when fixation is applied as a distinct service, not as part of the reduction technique
Impact: Proper distinction prevents NCCI edits and potential $355-605 denial
Use modifier 22 with detailed operative report when procedure requires significantly more time due to patient factors (e.g., previous radiation, severe ankylosis)
Impact: Can increase reimbursement by $121-302 (20-50% above base rate) with proper documentation
For emergency department applications, ensure proper coordination between ED and surgeon coding to avoid duplicate billing
Impact: Prevents compliance issues and potential $355-605 overpayment recovery
When performed with orthognathic surgery, verify payer policy on whether fixation is considered included or separately billable
Impact: Payer-specific rules may allow or deny the additional $355-605 payment

Common denials

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Frequently asked questions

What is the Medicare reimbursement rate for CPT 21100 in 2025?

The 2025 Medicare national average reimbursement for CPT 21100 is $605.20 for non-facility settings and $355.49 for facility settings. The work RVU is 4.73, with total RVUs of 18.71 using the 2025 conversion factor of 32.3465.

Can CPT 21100 be billed with mandibular fracture repair codes?

Generally no. CPT 21100 is typically bundled into fracture repair codes (21310-21497) per NCCI edits, as intermaxillary fixation is considered an integral component of fracture treatment. It should only be billed separately when performed as a distinct service independent of fracture reduction, such as application days after initial repair or for isolated occlusal stabilization without fracture treatment.

What modifiers are commonly used with CPT code 21100?

The most applicable modifiers are 51 (multiple procedures), 78 (return to OR during global period), 79 (unrelated procedure during postoperative period), 22 (increased procedural services), and 62 (co-surgeons). Modifier 50 (bilateral) may apply when fixation is performed independently on both sides, though the procedure typically involves both jaws as a standard approach.

What documentation is required to bill CPT 21100?

Required documentation includes clear medical necessity with supporting diagnosis, specific fixation technique used (arch bars, wiring method, etc.), anatomical locations, materials and wire gauge, verification that fixation is separate from any fracture repair if billing both, time spent when multiple procedures performed, and post-procedure occlusion confirmation. The operative report must distinguish fixation as a standalone service if billing separately from other maxillofacial procedures.

Why is there a $249.71 difference between facility and non-facility rates for 21100?

The difference reflects practice expense costs. The non-facility rate ($605.20) includes overhead for equipment, supplies, and staff when performed in a physician's office. The facility rate ($355.49) is lower because the hospital or ASC absorbs these overhead costs and bills separately for the facility fee. Accurate place-of-service coding is critical to avoid overpayment or underpayment.

Is CPT 21100 covered for orthognathic surgery patients?

Coverage varies by payer. Some insurers consider intermaxillary fixation integral to orthognathic surgery and bundle it into the primary procedure codes (21141-21147, 21194-21196). Others allow separate billing when fixation is medically necessary for post-surgical stabilization beyond routine surgical technique. Always verify payer-specific policies and document medical necessity clearly, noting duration of fixation and specific clinical indication.

What are the most common denial reasons for CPT 21100?

The top denial reasons are: bundling with fracture repair codes per NCCI edits, lack of medical necessity documentation, insufficient operative note detail failing to distinguish fixation as separate from other procedures, and incorrect place-of-service coding. To prevent denials, ensure comprehensive documentation clearly establishes fixation as a distinct service when billing separately from other maxillofacial procedures.