Percutaneous treatment of a mandibular fracture stabilized with an external fixation device, using small skin incisions rather than open exposure.

Verified May 8, 2026 · 5 sources ↓

Medicare: $765.55
Work RVU: 2.34
Global, days: 90
Region: Other

Drawn from CMSAAPCAAOS

Documentation requirements

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

Source · Editorial brief grounded in 5 cited references ↓

Specify percutaneous approach explicitly — 'small stab incisions made at [location]' rather than 'standard approach'
Identify the external fixation device by type (e.g., uniplanar frame, multiplanar frame) and confirm it was placed through the skin, not via open exposure
Document fracture site(s) with laterality and fracture pattern from pre-operative imaging (X-ray or CT)
State whether interdental/maxillomandibular fixation was or was not used — this is the distinguishing factor between 21452 and 21453
Record anesthesia type (local vs. general) and setting (OR vs. ASC)
For multi-fracture cases, document each fracture treated, the technique used for each, and the order procedures were performed

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 76 Repeat, same physician 78 Unplanned return — related 79 Unrelated during global 80 Assistant surgeon AS PA/NP/CNS assistant

What this code covers

Source · Editorial summary grounded in 5 cited references ↓

CPT 21452 covers percutaneous fixation of a mandibular fracture where the surgeon makes small stab incisions, reduces the fracture with specialized instruments, and secures an external fixation device — brackets and connecting rods — through the skin to hold alignment during healing. This is a minimally invasive approach: no wide soft-tissue dissection, no open plating. The 90-day global period applies, covering all routine post-op care through day 90.

The critical code-selection decision is 21452 versus 21453. Use 21452 when external fixation is the stabilization method and the approach is percutaneous. Use 21453 when interdental (maxillomandibular) fixation is used for closed treatment. If the operative note only says 'the patient was placed into maxillomandibular fixation' without specifying percutaneous access and an external device, 21453 is more defensible — or query the surgeon before billing. Vague approach language is the most common audit trigger on mandibular fracture claims.

This code sits in the 20000-series surgical range and is performed almost exclusively in a hospital OR or ASC setting. When multiple facial fractures are treated in the same operative session, list 21452 first if it carries the highest RVU value, and apply modifier 51 to secondary procedures. Document each fracture site, each fixation method, and the specific device used.

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 (2.34) is the surgeon's own effort — the figure physician pay and productivity targets are built on. The total RVU (22.92) adds practice overhead and malpractice, and is what drives the Medicare payment below.

Work RVU	2.34
Practice expense RVU	20.23
Malpractice RVU	0.35
Total RVU	22.92
Medicare national rate	$765.55
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	$765.55
HOPD (APC 5165) Hospital outpatient department	$6,048.05
ASC (PI A2) Ambulatory surgical center (freestanding)	$3,025.62

Common denial reasons

The recurring reasons claims for CPT 21452 get rejected.

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

Operative note documents maxillomandibular fixation without confirming percutaneous external device placement, creating ambiguity between 21452 and 21453
Upcoding flag when note lacks explicit description of percutaneous incisions and external fixator hardware — payers may downcode to 21453 (closed treatment)
Missing or mismatched ICD-10 diagnosis code — mandibular fracture diagnosis must align with documented fracture site and laterality
Modifier 51 omitted when 21452 is billed alongside other facial fracture repair codes in the same session
Global period violation — post-op visits billed without modifier 24 when the presenting problem is unrelated, or routine follow-up billed separately inside the 90-day window

Frequently asked questions

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

01What is the difference between CPT 21452 and 21453?

21452 requires a percutaneous approach with an external fixation device placed through the skin. 21453 is for closed treatment using interdental (maxillomandibular) fixation. If your op note documents MMF as the sole stabilization method, 21453 applies. If it documents percutaneous incisions and an external frame, 21452 applies. When the note is ambiguous, query the surgeon before billing.

02What global period applies to CPT 21452?

90-day global. All routine post-op visits, device checks, and minor wound care from the day before surgery through day 90 are included. Bill unrelated E&M services in that window with modifier 24.

03Can 21452 be billed with other facial fracture repair codes on the same date?

Yes. When multiple facial fractures are repaired in the same session, list the code with the highest RVU first and append modifier 51 to each additional procedure. Confirm no NCCI bundling edits apply between the specific code pair before billing.

04Which modifier applies if the procedure was significantly more complex than typical — for example, a comminuted fracture with difficult reduction?

Append modifier 22 and include a separate letter of medical necessity explaining the added complexity. Without supporting documentation, payers routinely reject modifier 22 claims or request records before processing.

05Is CPT 21452 performed in an ASC or hospital setting?

Both are used, but reimbursement differs. The HOPD and ASC payment rates differ — see the Site of Service comparison on this page. Most cases require general anesthesia and an OR-level environment, so a standalone office setting is not appropriate for this code.

06What ICD-10 codes pair with 21452?

Mandibular fracture diagnoses from the S02.6x category are the primary matches — specify the fracture site (symphysis, body, angle, ramus, subcondylar, coronoid process) and laterality where applicable. Confirm the diagnosis code reflects pre-operative imaging findings documented in the record.

Sources & references

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

Mira Scribe

Mira's AI scribe captures the percutaneous approach description, external fixation device type and placement site, fracture location and pattern, use or non-use of interdental fixation, and any co-treated facial fractures from the surgeon's dictation. That specificity prevents the most common denial on this code: a note that documents MMF without confirming the external percutaneous device, which triggers a downcode to 21453 or an outright rejection for insufficient documentation.

See how Mira captures CPT 21452 documentation