CPT 21431Surgery

Cltx craniofacial separation

CPT 21431 covers the surgical treatment of craniofacial separation, a severe traumatic injury where the facial bones become separated from the skull. This complex procedure requires skilled reconstruction to restore proper alignment between the cranium and facial skeleton.

Showing rates for

National Average

Base Medicare rate

$677.34

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

7.9

PE RVU (NF)

12.28

MP RVU

0.76

Total RVU

20.94

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

NCCI bundling edits

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Billing tips

Document the specific mechanism of injury and all anatomical components of the craniofacial separation including involvement of zygomatic arches, orbital rims, nasal complex, and pterygoid plates
Impact: Comprehensive documentation supports medical necessity and prevents downcoding to simpler fracture codes (21421-21423) which reimburse $200-400 less
Clearly differentiate closed treatment (21431) from open treatment (21432-21436) in operative note; document why closed approach was selected and feasible
Impact: Prevents automatic denials for under-treatment or confusion with higher-paying open procedures ($2,000+ difference) that may trigger audit
Bill on date of definitive reduction, not initial evaluation; if manipulation occurs over multiple sessions, use modifier 58 for staged procedures within global period
Impact: Ensures proper global period initiation and allows for staged treatment billing when medically necessary, potentially adding $400-600 for additional sessions
Code separately for interdental wiring/splints (21497) or arch bars (21110) if placed as part of intermaxillary fixation, as these are not bundled with 21431
Impact: Recovers additional $150-300 in reimbursement for fixation devices commonly required for craniofacial separation treatment
Use modifier 62 appropriately when neurosurgery involvement is required for concomitant cranial base or dural injuries; document each surgeon's distinct role
Impact: Ensures both specialists receive appropriate payment ($423.34 each vs. potential denial of second surgeon claim)
Link to appropriate ICD-10 codes for traumatic craniofacial disjunction (S02.413A for LeFort III) and document Glasgow Coma Scale and injury severity scoring

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Frequently asked questions

What is the 2025 Medicare reimbursement rate for CPT code 21431?

The 2025 Medicare national average payment for CPT 21431 is $677.34 for both facility and non-facility settings. This rate is based on 20.94 total RVUs (7.9 work RVU + 12.28 PE RVU + 0.76 MP RVU) multiplied by the 2025 conversion factor of 32.3465. Actual payment may vary based on geographic locality adjustments.

What is the difference between CPT 21431 and 21432 for craniofacial separation?

CPT 21431 describes closed treatment of craniofacial separation without surgical incision or open bone exposure, typically using manipulation and external or intermaxillary fixation. CPT 21432 involves open treatment requiring surgical incisions, direct visualization of fracture sites, and internal fixation with plates and screws. The choice depends on fracture displacement, stability, and patient factors.

Can CPT 21431 be billed with evaluation and management codes on the same day?

Yes, but only when a significant, separately identifiable E/M service is provided beyond the usual pre-procedure evaluation. Use modifier 25 on the E/M code and document the distinct nature of the service, such as comprehensive trauma assessment prior to the decision for craniofacial reduction or management of unrelated medical conditions.

What diagnosis codes support medical necessity for CPT 21431?

Primary ICD-10 codes include S02.413A (LeFort III fracture, initial encounter), S02.92XA (unspecified fracture of facial bones, initial), and S02.19XA (other fractures of base of skull, initial). Additional codes for mechanism of injury (V codes) and associated injuries (orbital fractures S02.3-, nasal fractures S02.2-) strengthen documentation of injury severity.

How many RVUs is CPT code 21431 worth in 2025?

CPT 21431 has 20.94 total RVUs in 2025, composed of 7.9 work RVUs, 12.28 practice expense RVUs (both facility and non-facility), and 0.76 malpractice RVUs. This places it among moderate-to-high complexity craniofacial procedures in terms of relative value.

What are common bundling issues with CPT 21431?

CPT 21431 may be bundled with separately placed arch bars (21110), interdental wiring (21497), or imaging services performed same day. Check NCCI edits before billing multiple fracture repair codes together. Modifiers 59 or XU may be appropriate when treating truly distinct anatomical sites, but documentation must clearly support separate procedures.

What is the global period for CPT 21431?

CPT 21431 has a 90-day global period, meaning routine follow-up care for 90 days post-procedure is included in the reimbursement. Services during this period require modifiers 24 (unrelated E/M), 78 (related return to OR), or 79 (unrelated procedure) to receive separate payment. Document any services as distinct from routine postoperative care.