Open treatment of craniofacial separation (skull-to-facial-bone fracture) with wire fixation applied through a surgical incision.

Verified May 8, 2026 · 6 sources ↓

Medicare: $672.03
Work RVU: 8.6
Global, days: 90
Region: Other

Drawn from CMSAAPCBanner HealthAMA

Documentation requirements

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

Source · Editorial brief grounded in 6 cited references ↓

Mechanism and severity of trauma establishing craniofacial separation (skull-facial disjunction), not a simple facial fracture
Operative note specifying surgical approach by name and anatomic access point(s) used to reach the fracture
Explicit documentation of open reduction technique and type of fixation applied (wiring, plates, or combination)
Distinct operative notes from each surgeon if modifier 62 is used, describing individual roles and work performed
Pre- and post-reduction imaging (CT preferred) confirming fracture pattern and adequacy of reduction
Documentation distinguishing complexity level from 21433/21435/21436 if those codes were considered and not selected

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 59 Distinct service 62 Co-surgeons 76 Repeat, same physician 77 Repeat, another physician 78 Unplanned return — related 79 Unrelated during global 80 Assistant surgeon 24 Unrelated E/M during global 25 Significant separate E/M

What this code covers

Source · Editorial summary grounded in 6 cited references ↓

CPT 21432 covers open surgical treatment of a craniofacial separation — the traumatic disjunction of the skull from the facial skeleton, classically a high-energy Le Fort–type or equivalent craniofacial injury. The surgeon accesses the fracture through incision(s), reduces the displaced segments, and stabilizes the construct with wiring or comparable fixation hardware. This is distinct from closed treatment (21431), which involves no incision, and from the more complex multi-approach variants (21433, 21435, 21436) that involve additional osteotomies, internal fixation systems, or combined craniofacial approaches.

The code carries a 90-day global period. That window covers the operative day, any day-before preoperative visit billed under the surgeon's NPI, and all routine postoperative management through day 90. Unrelated E/M services in the global window require modifier 24. A separately identifiable E/M on the day of surgery needs modifier 25 if billed pre-operatively, or modifier 24 post-operatively if truly unrelated. An unplanned return to the OR for a related complication within the global uses modifier 78; an unrelated procedure in that same window uses modifier 79.

CMS assigns this code to APC 05165 in the HOPD setting (January 2026 I/OCE). Two-surgeon billing with modifier 62 is applicable when separate surgeons perform distinct components — for example, a neurosurgeon managing the cranial component while a craniofacial or oral-maxillofacial surgeon manages the facial skeleton. Each surgeon reports 21432-62 with individual operative notes documenting their distinct work.

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 (8.6) is the surgeon's own effort — the figure physician pay and productivity targets are built on. The total RVU (20.12) adds practice overhead and malpractice, and is what drives the Medicare payment below.

Work RVU	8.6
Practice expense RVU	9.93
Malpractice RVU	1.59
Total RVU	20.12
Medicare national rate	$672.03
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	$672.03
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 21432 get rejected.

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

Upcoding flags when 21432 is billed but the operative note describes a simple midfacial fracture without true craniofacial separation
Modifier 62 denied because co-surgeon operative notes do not document distinct, separately performed components of the procedure
Global period violations — routine post-op visits billed without modifier 24 or 79 are denied as included services
Incorrect code selection — payers deny 21432 when documentation supports only closed treatment, correctly payable under 21431
Missing or insufficient imaging documentation to support craniofacial separation diagnosis linked to ICD-10 code billed

Frequently asked questions

Source · Generated from the editorial pipeline, verified against 6 cited references ↓

01What distinguishes 21432 from 21431?

21431 is closed treatment — no incision, no surgical access. 21432 requires open surgical access to the fracture site with direct reduction and wiring. If you opened the fracture, you're in 21432 territory, not 21431.

02When should I use 21433 instead of 21432?

21433 covers open treatment of a craniofacial separation that requires multiple surgical approaches or more complex reconstruction beyond wire fixation alone. If your operative note documents a single-approach open reduction with wiring, 21432 is correct. Document why the complexity warrants 21433 if you go that route — auditors will look.

03Can two surgeons each bill 21432 on the same case?

Yes, with modifier 62. Each surgeon must submit a separate operative note documenting their distinct portion of the procedure — typically one managing the cranial component, one the facial skeleton. Both append modifier 62. Notes that describe the same work performed together without clear division of labor will be denied.

04Does the 90-day global period affect follow-up billing with other specialties involved in the patient's care?

The global period only restricts the billing surgeon's routine post-op E/M claims. Other treating physicians (e.g., ophthalmology managing orbital injury, neurosurgery managing a concurrent cranial issue) bill their own E/M or procedure codes independently without modifier restriction from 21432's global.

05What ICD-10 codes support medical necessity for 21432?

Craniofacial separation maps to S02 fracture-of-skull-and-facial-bones subcategories. The specific code depends on fracture type and laterality. A Le Fort III-type craniofacial disjunction should be coded to the most specific S02 code available. Pairing a generic facial fracture code without documentation of the craniofacial separation pattern is a common denial trigger.

06Is modifier 22 appropriate for a particularly complex craniofacial separation treated with 21432?

Yes, if the operative work was substantially greater than typical — for example, severely comminuted fractures, prior facial hardware complicating reduction, or prolonged operative time with documented unusual difficulty. Attach a cover letter quantifying the added work and operative time. Without supporting documentation, payers routinely reject modifier 22 claims.

Sources & references

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

01CMS Physician Fee Schedule 2026
02CMS January 2026 Integrated Outpatient Code Editor (I/OCE): https://www.cms.gov/files/document/r13575cp.pdf
03AAPC Codify CPT 21432: https://www.aapc.com/codes/cpt-codes/21432
04CMS NCCI Medicare Coding Policy Manual 2025: https://www.cms.gov/files/document/2025nccimedicarepolicymanualcompletepdf.pdf
05Banner Health 2025 IPO CPT Code List: https://www.bannerhealth.com/-/media/Files/Project/BH/Patients-Visitors/Billing/IPO/IPO-CPT-List-CY-2025-9162025.pdf
06AMA CPT Assistant Musculoskeletal System Coding Guidance (May 2022): https://www.ama-assn.org/system/files/cpt-assistant-may2022-update-musculoskeletal.pdf

Mira AI Scribe

Mira's AI scribe captures the fracture mechanism, the specific anatomic separation between cranial and facial skeleton, the surgical approach and access incisions, the reduction technique, and the exact fixation method applied (wiring type, placement sites). It flags operative notes that describe only a generic 'facial fracture' without documenting the craniofacial disjunction — the most common audit trigger that drives downcoding to a lower-complexity facial fracture code or outright denial.

See how Mira captures CPT 21432 documentation