Closed treatment of a palatal or maxillary fracture using wire fixation to stabilize the fractured segments without open surgical exposure.

Verified May 8, 2026 · 5 sources ↓

Medicare: $660.00
Work RVU: 5.87
Global, days: 90
Region: Other

Drawn from CMSAAOS

Documentation requirements

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

Source · Editorial brief grounded in 5 cited references ↓

Operative note must confirm closed treatment — no open exposure of the fracture site documented
Specify the fracture pattern (palatal vs. maxillary) and the anatomic extent of displacement
Document the wire fixation technique used and the number and placement of wires
Include imaging (CT or plain film) confirming fracture type and post-reduction alignment
Mechanism of injury and clinical findings supporting fracture diagnosis must appear in the record
If modifier 57 is used for a same-day or prior-day E/M, document the decision for surgery distinctly from routine preoperative assessment

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 52 Reduced services 57 Decision for surgery 58 Staged or related 62 Co-surgeons 76 Repeat, same physician 77 Repeat, another physician 78 Unplanned return — related 79 Unrelated during global 80 Assistant surgeon LT Left side RT Right side

What this code covers

Source · Editorial summary grounded in 5 cited references ↓

CPT 21421 covers closed treatment of a palatal or maxillary fracture where wire fixation is applied to hold fractured bone segments in alignment. The key distinction from 21422 and 21423 is that no surgical opening of the fracture site occurs — the stabilization is achieved percutaneously or through intraoral wire placement rather than direct open reduction.

This code carries a 90-day global period. That means the surgery, the day-before decision visit (if modifier 57 is used), and all routine postoperative management through day 90 are bundled into the single payment. Separately billing follow-up visits for routine wound checks, wire adjustments, or swelling management within the global window will be denied unless a distinct unrelated condition is documented and modifier 24 is appended.

Note that CPT 21421 was among codes modified in the 2025 HCPCS update cycle per CMS records. If you're billing this in 2026, confirm you're using the current descriptor and that your claim form reflects the updated short description ('Cltx palatal/max fx wire fix'). Open treatment of the same fracture pattern upgrades to 21422 (simple) or 21423 (complex) — do not use 21421 if the operative note documents any direct fracture site exposure.

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 (5.87) is the surgeon's own effort — the figure physician pay and productivity targets are built on. The total RVU (19.76) adds practice overhead and malpractice, and is what drives the Medicare payment below.

Work RVU	5.87
Practice expense RVU	13.23
Malpractice RVU	0.66
Total RVU	19.76
Medicare national rate	$660.00
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	$660.00
HOPD (APC 5164) Hospital outpatient department	$3,387.27
ASC (PI A2) Ambulatory surgical center (freestanding)	$1,480.50

Common denial reasons

The recurring reasons claims for CPT 21421 get rejected.

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

Upcoding flags when operative note describes open exposure — defaulting to 21421 when 21422 or 21423 is the correct code
Routine postoperative visits billed within the 90-day global period without modifier 24 and documentation of an unrelated condition
Missing or inadequate imaging documentation to support the fracture diagnosis at time of claim review
Failure to differentiate palatal from maxillary fracture subtype when payer requests specificity in the operative record
Same-day E/M billed without modifier 57 when the decision for this major procedure was made at that visit

Frequently asked questions

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

01What separates 21421 from 21422 and 21423?

The treatment approach. 21421 is closed — no direct surgical exposure of the fracture site. 21422 is open treatment of a simple palatal or maxillary fracture. 21423 is open treatment of a complex fracture. If your operative note documents any incision to expose the fracture, 21421 is not the right code.

02Can I bill a postoperative office visit during the 90-day global period?

Not for routine follow-up — that's bundled into 21421's 90-day global. If the patient presents with a new, unrelated problem, bill the E/M with modifier 24 and document clearly that the visit addressed an issue outside the fracture management.

03When does modifier 57 apply to an E/M billed alongside 21421?

Use modifier 57 on the E/M code when the decision to perform this procedure was made at that visit — typically the day of or the day before surgery. Since 21421 carries a 90-day global, modifier 57 is the correct tool here, not modifier 25.

04Is wire fixation always required to bill 21421, or does the closed approach alone qualify?

The code specifically includes wire fixation. Closed treatment without wire fixation is a different clinical scenario and may not support 21421. Document the wire placement explicitly in the operative note.

05How do I handle a return to the OR within the 90-day global for a related complication?

Use modifier 78 for an unplanned return to the OR for a complication or issue directly related to the original fracture repair. Modifier 79 is for an unrelated procedure in the global period. Do not invert these — wrong modifier assignment is a common audit finding.

06Is 21421 subject to NCCI bundling edits with imaging codes?

Per the CMS NCCI policy manual, if the code descriptor or CMS instruction indicates radiologic guidance is included in a procedure, you cannot separately bill an imaging code. Review the specific NCCI edits for 21421 before billing fluoroscopy or other intraoperative imaging separately.

Sources & references

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

Mira Scribe

Mira's AI scribe captures the fracture classification (palatal vs. maxillary), the closed treatment approach confirming no surgical exposure of the fracture site, wire fixation technique and placement details, and pre- and post-reduction imaging findings from your dictation. This prevents the most common audit flag on 21421: an operative note that doesn't explicitly rule out open exposure, which reviewers use to question whether the higher-paying 21422 or 21423 should have been billed — or conversely, to deny 21421 as underdocumented.

See how Mira captures CPT 21421 documentation