CPT code 21422: Open treatment of palatal or maxillary fracture

Key takeaways

CPT code 21422 describes open surgical treatment of a palatal or maxillary fracture (LeFort I type), classified under Fracture and Dislocation Procedures on the Head.

Codes 21421, 21422, and 21423 all describe LeFort I fractures, separating closed treatment from uncomplicated and complicated open treatment.

LeFort II open repair belongs to codes 21346 to 21348, and LeFort III open repair to codes 21432, 21433, and 21435.

ICD-10 encodes the LeFort level in the root: S02.411 is LeFort I, S02.412 is LeFort II, and S02.413 is LeFort III.

Common modifiers include 22 (increased complexity), 62 (two surgeons), and 80 (assistant surgeon). Verify applicability against payer-specific policies before submission.

Pabau’s claims management software supports modifier validation and claim scrubbing for surgical codes like 21422, helping oral and maxillofacial surgery practices reduce denials.

CPT code 21422 carries the following official AMA descriptor: Open treatment of palatal or maxillary fracture (LeFort I type). It sits within the Musculoskeletal System subsection of the CPT code set, specifically under Fracture and/or Dislocation Procedures on the Head (codes approximately 21400-21490).

The procedure means gaining direct surgical access to the fractured maxilla or palate. The surgeon then reduces the fracture under direct visualization and stabilizes it with fixation hardware such as plates and screws. Code 21422 is confined to the LeFort I level. Higher LeFort levels sit in separate code families, so the fracture level has to be confirmed before the code is chosen.

LeFort I fracture treatment: Clinical context for coders

The LeFort classification describes three horizontal fracture patterns of the midface, each named after the French surgeon René LeFort. Understanding the classification is essential for selecting the correct CPT code, because each LeFort level has its own code family. Coders working in plastic surgery practice management or oral and maxillofacial surgery environments encounter this classification regularly.

Only the LeFort I row is billed with CPT code 21422. LeFort II and LeFort III repairs each have their own code family, set out in the next section.

Open surgical treatment of a LeFort I fracture is indicated in three situations:

• Closed reduction cannot achieve or maintain adequate alignment.
• The fracture is significantly displaced.
• Soft-tissue trauma makes external fixation impractical.

The operative report has to confirm the fracture level, the surgical approach, and the fixation method used. Payers expect documentation that directly supports the specific code billed.

CPT code 21422 vs adjacent codes: 21421 and 21423

The most frequent coding error with this code family is selecting the wrong treatment approach or the wrong fracture level. Coders reviewing adjacent CPT code families often note how similar descriptors can mask meaningful clinical distinctions. The table below clarifies where each code applies.

Key distinction: All three codes apply to LeFort I fractures, so the deciding factors are the approach and the complexity. If the surgeon performs closed reduction with wire fixation or a splint and does not open the fracture site, use 21421. If the surgeon makes incisions, directly visualizes the fracture, and applies internal fixation plates, use 21422. Move to 21423 only when the note documents a complicated fracture treated through multiple approaches.

Where LeFort II and LeFort III repairs are coded

Neither 21422 nor 21423 covers a LeFort II or LeFort III fracture. Both stop at the LeFort I level. Open repair at the higher levels is reported from these families:

• LeFort II, nasomaxillary complex fracture: 21346 for wiring or local fixation, 21347 when multiple open approaches are required, and 21348 when bone grafting is included.
• LeFort III, craniofacial separation: 21432 covers wiring or internal fixation, and 21433 covers a complicated repair through multiple surgical approaches. Code 21435 covers a complicated repair using internal or external fixation such as a halo device.

A patient can present with fractures at more than one LeFort level. Code the level actually repaired at each site, and document the separate operative work that supports each code.

ICD-10 codes commonly paired with CPT code 21422

Every claim for CPT code 21422 requires a supporting ICD-10-CM diagnosis code that documents the fracture type and encounter context. Coders familiar with ICD-10 diagnosis code documentation know how much the encounter character affects the claim. Initial encounter (A), subsequent encounter (D), and sequela (S) each set a different eligibility for acute surgical treatment.

For an acute LeFort I fracture being surgically repaired, the appropriate suffix is A (initial encounter). According to CDC/NCHS ICD-10-CM guidelines, the initial encounter suffix applies to active treatment of the fracture, which includes the surgical repair itself. The diagnosis codes used with CPT 21422 come from subcategory S02.411, LeFort I fracture. That subcategory sits within S02, fractures of the skull and facial bones.

Two codes are worth ruling out before you submit. S02.42 is fracture of alveolus of maxilla, a separate injury that does not describe a LeFort fracture. There is no S02.43 subcategory in ICD-10-CM, so a claim carrying it will reject as an invalid code. The LeFort level always sits in the S02.411, S02.412, and S02.413 roots. The seventh character then separates a closed fracture (A) from an open one (B).

Distinguish between an “open fracture” (where the bone communicates with the external environment through a wound) and “open treatment” (the surgical approach). A LeFort I fracture treated with open reduction may carry diagnosis code S02.411A (closed fracture, initial encounter) even though the procedure is open treatment. The ICD-10 fracture type descriptor refers to the injury, not the surgical approach. Coders frequently confuse these two axes, which can produce a mismatched claim. Always verify with the clinical team before finalizing ICD-10 coding reference assignments across trauma cases.

Applicable modifiers for CPT code 21422

Modifiers expand the clinical context of a claim without changing the procedure code itself. For CPT code 21422, several modifiers apply in specific surgical scenarios. Incorrect modifier use can trigger automatic downcoding or denial, so each modifier below requires documentation support verified against payer-specific policies. The National Correct Coding Initiative (NCCI) edits published by CMS govern bundling rules. Check them whenever CPT 21422 is billed alongside other procedure codes.

Payer policies on modifier applicability vary, and commercial payers often depart from Medicare rules. Confirm each modifier against the specific payer’s policy before the claim goes out.

Medicare reimbursement rates for CPT code 21422

Reimbursement for CPT code 21422 under the Medicare Physician Fee Schedule (MPFS) depends on the site of service and the geographic locality. The CMS MPFS adjusts payment using the Geographic Practice Cost Index (GPCI), which accounts for regional variations in labor costs, practice expenses, and malpractice premiums. Rates below reflect general 2025/2026 Medicare benchmarks; coders should confirm current figures using the CMS Physician Fee Schedule lookup tool for their specific MAC jurisdiction.

Important: Medicare rates for CPT 21422 change annually with the MPFS update, typically effective January 1. Any reimbursement figure quoted internally should carry the year it came from, so staff can tell at a glance when it has gone stale.

RVU breakdown for CPT code 21422

The resource-based relative value scale (RBRVS) converts clinical work into a payment formula. Every CPT code is assigned total relative value units (RVUs) built from three components. Code 21422 follows the same structure as every other surgical code. Use the FastRVU 2026 RVU lookup tool to retrieve current values by MAC locality.

The payment formula is: Total RVU x GPCI-adjusted conversion factor = Medicare payment. For 2025, CMS published a conversion factor of approximately $32.35 (subject to Congressional adjustment). Multiply the total RVU for CPT 21422 by the applicable GPCI-adjusted conversion factor for your locality to estimate the Medicare physician payment. Specific RVU values for CPT 21422 must be retrieved directly from the current CMS MPFS data file, as figures change annually.

Facility vs non-facility billing for CPT code 21422

The site of service directly determines which payment rate applies. CPT code 21422 is almost always performed in a facility setting, either hospital inpatient or an ambulatory surgical center. Open maxillofacial fracture repair requires general anesthesia and a sterile surgical environment. The CPT code billing guidelines around site-of-service apply consistently across the surgical range.

• Facility setting (POS 21 – Inpatient Hospital; POS 22 – Outpatient Hospital; POS 24 – ASC): The physician submits a claim for professional services only. The facility bills separately under its own rate schedule for overhead, staff, supplies, and equipment. Medicare pays the physician the lower facility rate for CPT 21422.
• Non-facility setting (POS 11 – Office): The physician absorbs all overhead costs and receives the higher non-facility rate. This setting is highly unusual for CPT 21422 given the surgical complexity and anesthesia requirements.
• Place of service code mismatch: Submitting the facility rate with a non-facility POS code, or vice versa, is a common claim error. The POS code on the CMS-1500 form must match the actual location of service.

When billing for a two-surgeon case with modifier 62, both surgeons must use the same POS code. Inconsistent POS codes on co-surgery claims draw payer scrutiny and can trigger a full claim hold. Using automated billing workflows helps catch POS mismatches before claims leave the practice.

NCCI edits, bundling, and the global period for CPT code 21422

Open LeFort I repair rarely happens on its own. Facial trauma patients often need several procedures in one session, and bundling rules decide what gets paid. The National Correct Coding Initiative edits published by CMS list the code pairs that are treated as a single service.

• Codes within the same family: 21421, 21422, and 21423 describe the same repair at different levels of effort. Report only one of them per fracture site.
• Work at the operative site: Exposure, reduction, fixation, and closure at the fracture site are ordinarily included in 21422. Billing them separately invites an edit.
• Genuinely separate procedures: A mandibular fracture repaired in the same session is distinct work. Append modifier 59 or the applicable X modifier, and document each site independently.

The global period for CPT code 21422

CMS assigns CPT code 21422 a 090 global period, covering one preoperative day and 90 postoperative days. Routine follow-up inside that window is already paid for by the surgical fee. Billing those visits as separate office encounters is a predictable denial.

Two exceptions come up often in facial trauma. Care unrelated to the fracture repair takes modifier 24, and a return to the operating room for a complication takes modifier 78. Confirm the current global period indicator in the CMS MPFS relative value file before you rely on it.

Documentation requirements and billing guidelines for CPT code 21422

An accurate operative report is the foundation of a defensible CPT 21422 claim. Payers audit facial fracture surgery codes at higher rates than routine office visits. A missing element in the note can turn a clean claim into a denial or a takeback. The ICD-10-CM code lookups inform the diagnosis side, but the procedure side requires its own documented elements.

The operative note for CPT code 21422 must include all of the following:

• Fracture classification confirmed intraoperatively: Document that the fracture pattern meets the LeFort I definition (horizontal fracture through the maxilla, separating the palate and alveolar process). If imaging confirmed the classification preoperatively, reference the imaging study by date and modality.
• Surgical approach documented: State that incisions were made to access the fracture site directly. Describe the specific approach (e.g., sublabial/gingivobuccal sulcus incision, coronal incision). The open nature of the treatment must be explicit, not implied.
• Reduction and fixation method: Describe how the fracture was reduced (manually, with instruments) and what fixation was placed (titanium mini-plates, screws, wire, intermaxillary fixation). Include hardware specifics where possible.
• Medical necessity statement: Document why open treatment was necessary rather than closed treatment. Common justifications include significant displacement, comminution, failed or inadequate closed reduction, or associated soft-tissue injuries.
• Laterality: Note whether the fracture is unilateral or bilateral. Bilateral fixation may support modifier 50 in specific payer contexts, but verify policy before use.

Using digital operative documentation tools that capture structured note elements reduces the risk of missing a required field at submission. A template that forces an entry for fracture level, approach, and fixation method is the simplest guard against a documentation denial.

Common billing errors with CPT code 21422

Denials on this code cluster around a short list of recurring mistakes. Every one of them is preventable at the point of coding.

• Coding the wrong LeFort level: Assigning 21422 or 21423 to a LeFort II or LeFort III repair. Those levels have their own families, 21346 to 21348 and 21432 to 21435.
• Treating a long case as a complicated one: Reaching for 21423 because the operation ran long. The code needs documented comminution or cranial nerve foramina involvement treated through multiple approaches.
• Reading the ICD-10 open descriptor as the surgical approach: Choosing S02.411B because the treatment was open. The B character describes an open injury, not an open repair.
• Submitting a code that is not a LeFort code: S02.42 is an alveolar fracture of the maxilla. S02.43 is not a valid subcategory at all.
• Billing follow-up inside the global period: Charging separately for routine postoperative visits that the 90-day global period already covers.
• Mismatched place of service: Submitting the non-facility rate for a procedure performed in a hospital or an ambulatory surgical center.

How practice management software supports CPT code 21422 billing

Open maxillofacial fracture repair is a low-volume, high-complexity code. One undocumented field or mismatched modifier can delay payment by 30-60 days. Claims management software built for surgical specialties addresses the most common failure points in the 21422 billing cycle.

Pabau’s practice management software supports oral and maxillofacial surgery billing teams in three places. Automated modifier validation flags when modifier 62 is used without a co-surgeon claim. ICD-10 pairing checks alert you when the diagnosis code does not match the encounter type. Claim scrubbing then runs before anything is submitted. Practices using structured clinical documentation workflows report fewer payer-initiated documentation requests on complex surgical codes.

For multi-location oral surgery groups, centralizing billing validation through a single platform reduces inconsistency. Without it, individual staff members tend to apply modifier rules differently across sites. The AAPC Codify CPT lookup remains a useful cross-reference during code selection. The workflow layer that catches errors before submission is where revenue cycle efficiency is won or lost.

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Conclusion

CPT code 21422 is a precisely scoped code: Open surgical treatment of a LeFort I palatal or maxillary fracture, nothing more and nothing less. Getting it right means confirming the fracture level, the surgical approach, and the complexity of the repair.

When 21422 does not fit, the correct neighbor depends on which of those three changed. Closed treatment of a LeFort I fracture is 21421, and a complicated LeFort I repair is 21423. A LeFort II repair moves to the 21346 to 21348 family, and a LeFort III repair to 21432 to 21435. The diagnosis code then has to match the level you coded, using the S02.411, S02.412, or S02.413 root with the correct seventh character.

Pabau’s claims management software helps surgical billing teams build validation rules around exactly these distinctions. Modifier mismatches and ICD-10 pairing errors get caught before they reach the payer. To see how Pabau supports oral and maxillofacial surgery billing workflows, book a demo with our team.

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