Closed treatment of craniofacial separation — repositioning and stabilizing the skull-to-facial-skeleton disjunction without open surgical exposure.

Verified May 8, 2026 · 5 sources ↓

Medicare: $646.98
Work RVU: 7.7
Global, days: 90
Region: Other

Drawn from CMSAAPCMdclarityBillrazorAAOS

Documentation requirements

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

Source · Editorial brief grounded in 5 cited references ↓

Mechanism and energy of injury with clear description of craniofacial disjunction pattern (e.g., Le Fort III equivalent, naso-orbito-ethmoid involvement)
Imaging confirmation — CT facial bones or craniofacial CT with reads documenting skull-to-facial-skeleton separation
Description of closed reduction technique: specific manipulation maneuvers performed, force applied, and instruments or fixation devices used for stabilization
Type of splint, arch bar, or intermaxillary fixation applied, including duration planned
Pre- and post-reduction clinical findings including occlusion, facial projection, and orbital rim position
Documentation of any concurrent specialist involvement (neurosurgery, ophthalmology) and whether those services are separately billed

Applicable modifiers

Modifiers commonly billed with this code.

Source · AMA CPT modifier descriptors · CMS NCCI Policy Manual

22 Increased complexity 24 Unrelated E/M during global 25 Significant separate E/M 51 Multiple procedures 52 Reduced services 57 Decision for surgery 58 Staged or related 62 Co-surgeons 78 Unplanned return — related 79 Unrelated during global 80 Assistant surgeon AS PA/NP/CNS assistant XS Separate structure

What this code covers

Source · Editorial summary grounded in 5 cited references ↓

CPT 21431 covers closed (non-operative) management of a craniofacial separation, the traumatic disjunction between the cranial base and the facial skeleton. This injury pattern — historically classified within the Le Fort III or similar high-energy fracture spectrum — involves manipulating displaced segments back into anatomic alignment and maintaining that reduction through splinting, intermaxillary fixation, or external stabilization, without formal open reduction and internal fixation.

The 90-day global period means the treating physician's routine post-reduction visits, splint adjustments, and fracture-monitoring encounters are all bundled through day 90. Any unrelated E/M service in that window requires modifier 24. A separately identifiable same-day E/M needs modifier 25. Because this is a high-severity craniofacial injury, cases frequently involve co-management with neurosurgery or ophthalmology; document those concurrent services clearly to distinguish independently billable work.

Site of service matters: the HOPD and ASC payment rates differ substantially (see the Site of Service comparison table). Most high-energy craniofacial separations present through the ED and are managed in the inpatient or HOPD setting; confirm facility billing alignment before submitting. Verify NCCI bundles if additional facial fracture codes are reported on the same date — overlapping fracture management codes in the craniofacial region are common NCCI edit triggers.

RVU & reimbursement

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

Source · CMS Physician Fee Schedule, RVU26A · January 2026

Work RVU vs. total RVU

The work RVU (7.7) is the surgeon's own effort — the figure physician pay and productivity targets are built on. The total RVU (19.37) adds practice overhead and malpractice, and is what drives the Medicare payment below.

Work RVU	7.7
Practice expense RVU	10.79
Malpractice RVU	0.88
Total RVU	19.37
Medicare national rate	$646.98
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	$646.98
HOPD (APC 5165) Hospital outpatient department	$6,048.05
ASC (PI J8) Ambulatory surgical center (freestanding)	$3,833.49

Common denial reasons

The recurring reasons claims for CPT 21431 get rejected.

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

Operative note describes open exposure or internal fixation — defaulting to 21431 when 21432 (open treatment) is the correct code
NCCI bundling conflict when multiple craniofacial or midface fracture codes are billed on the same date without appropriate modifier 59 or XS to establish distinct anatomic sites
Missing imaging documentation — payers deny without CT confirmation of craniofacial separation as distinct from isolated facial fracture
Global period violation — post-reduction E/M visits billed without modifier 24 during the 90-day window
Medical necessity not established — operative or clinical note lacks documentation of the degree of displacement or functional impairment justifying closed reduction

Frequently asked questions

Source · Generated from the editorial pipeline, verified against 5 cited references ↓

01What distinguishes 21431 (closed) from 21432 (open treatment) of craniofacial separation?

21431 is the correct code when reduction is achieved by manipulation and external stabilization alone, with no formal surgical exposure of the fracture. If you make incisions to directly visualize and fix the craniofacial junction — even with limited approaches — bill 21432 instead. The distinction drives a significant RVU difference and is a top audit target.

02Does 21431 cover the post-reduction visits?

Yes. The 90-day global period bundles all routine follow-up through day 90. Bill modifier 24 on any unrelated E/M in that window, and modifier 25 for a separately identifiable same-day E/M before the procedure.

03Can I bill concurrent facial fracture codes with 21431 on the same date?

Only if the additional fractures are anatomically distinct and not already captured by the craniofacial separation code. NCCI edits bundle overlapping craniofacial and midface fracture codes. Use modifier 59 or XS with documentation of separate injury sites; expect payer scrutiny without a clear operative note explaining each distinct fracture treated.

04When is modifier 22 appropriate for 21431?

Add modifier 22 when the complexity significantly exceeds the typical presentation — for example, severely comminuted separation requiring prolonged manipulation, morbid obesity impeding access, or a pediatric patient with thin skull osteology complicating fixation. The op note must quantify extra time or describe the specific complicating factors; a bare modifier 22 without supporting documentation will be denied.

05Is prior authorization typically required for 21431?

Most acute trauma cases presenting through the ED bypass standard prior-auth pathways, but payer policies vary. Some Medicaid managed care plans and commercial payers require retrospective authorization for craniofacial fracture management. Verify with the specific payer, particularly for non-emergent delayed reductions.

06Can two surgeons bill modifier 62 for craniofacial separation treatment?

Modifier 62 (co-surgeons) applies when two surgeons of different specialties each perform distinct portions of a single procedure. If a craniofacial or oral-maxillofacial surgeon and a neurosurgeon each manage distinct components of the injury in a coordinated session, modifier 62 may be appropriate. Both operative notes must describe each surgeon's distinct contribution, and not all payers accept 62 on this code — verify before submitting.

Sources & references

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

Mira Scribe

Mira's AI scribe captures the injury classification (craniofacial separation vs. isolated midface fracture), the specific reduction maneuver and stabilization method used, pre- and post-reduction occlusal and orbital findings, and imaging correlation from dictation. That prevents the most common audit flag on 21431: operative notes that describe an open approach or internal fixation without a corresponding code change to 21432, and notes that omit the distinct craniofacial disjunction pattern required to distinguish this code from lower Le Fort levels.

See how Mira captures CPT 21431 documentation