CPT code 21100: Maxillofacial fixation2026 Medicare rate & RVUs in Delaware
Reports halo-based fixation to stabilize the craniofacial skeleton, including the fixation service’s removal, when performed by the treating surgeon.
Medicare pays $624.47 for 21100 in the office in Delaware (Delaware). Which amount applies depends on the service address.
Medicare allowed amount for participating (non-QP) physicians, before deductible, coinsurance and claim adjustments. Not a patient’s bill or a hospital charge.
On this page 9 sections
What 21100 covers
This service covers applying a halo-based external fixation construct to stabilize the craniofacial skeleton and includes removal of the construct. It may be performed by an oral and maxillofacial surgeon or another surgeon treating the craniofacial condition, generally in an operative setting. The record should identify the condition requiring stabilization, the fixation method, and the application and removal performed.
Report the service for the halo fixation procedure, not for tooth-based interdental fixation. The day-before preoperative visit and 90 days of related postoperative care are included in the 90-day global period. When multiple procedures are performed in the same session, the highest-valued procedure is paid in full and other procedures are subject to the standard multiple procedure reduction. Modifier 50 is inappropriate for this descriptor and anatomy. Assistant-at-surgery payment requires documentation of medical necessity; co-surgeons and team surgery are not permitted.
This summary was written with AI assistance from CMS physician fee schedule data and checked against the CMS billing rules shown here. Rates on this page come directly from CMS files.
21100 in Delaware
| Payment locality | Office | Facility |
|---|---|---|
| Delaware | $624.47 | $329.45 |
How the 21100 rate is calculated
Each of 21100’s three RVUs is multiplied by a geographic index (GPCI) for the payment locality, added up, and multiplied by the conversion factor. Drag the indexes or enter a ZIP to see what moves the rate.
How the rate is built · 21100
RVUs × geographic indexes × conversion factor
Work4.61
4.61 RVUs× 1.000 GPCI
Practice expense13.77
13.77 RVUs× 1.000 GPCI
Malpractice0.51
0.51 RVUs× 1.000 GPCI
Adjusted RVUs
18.8900
Conversion factor
$33.4009
Medicare rate
$630.94
Every GPCI starts at 1.000, the national rate. Enter a ZIP or drag a slider.
Payment rules and modifiers for 21100
21100 has a 90-day global period: related visits in that window are included in the surgery payment.
CMS payment indicators · 21100
Maxillofacial fixation
| Rule | CMS value | What it means |
|---|---|---|
| Global period | 090 | Major surgery: the day before, the day of, and 90 days after are included. |
| Multiple procedures | 2 | Standard reduction: highest-valued procedure at 100%, others at 50%. |
| Bilateral (modifier 50) | 0 | The 150% bilateral adjustment doesn’t apply. |
| Assistant at surgery (80/81/82/AS) | 0 | Not paid without supporting documentation. |
| Co-surgeons (62) | 0 | Not permitted. |
| Team surgery (66) | 0 | Not permitted. |
| Professional/technical | 0 | Physician service: no professional/technical split. |
| Split (54/55/56) | 0.10/0.69/0.21 | Share of the payment for pre-op, the procedure itself, and post-op care. |
Global surgery period · 21100
Maxillofacial fixation
90-day global period ends
Dec 30, 2026
Covers Sep 30, 2026 through Dec 30, 2026 (92 days, including the day before surgery).
Visit on Oct 31, 2026
Day 30 of the 90-day post-op period: related follow-up care is included in the surgical payment.
Pre-op dayGlobal period
What modifiers do to the payment
Modifier 51 · payment effect
With and without the modifier
21100 without 51 · national office
$630.94
Maxillofacial fixation
21100-51 · Second procedure: 50%
$315.47
When this isn’t the highest-valued procedure in the session, Medicare pays 50% of its fee schedule amount (the highest is paid at 100%).
21100 compared with similar codes
Compare codes · National
4 codes, side by side
How to choose
- 21110Interdental fixation
- Choose 21100 for halo-based maxillofacial fixation. Code 21110 is for an interdental fixation device used in conditions other than fracture or dislocation.
- 20661Cranial halo
- Code 20661 is the orthopedic-family halo application code. Use 21100 for the maxillofacial fixation service described here, rather than halo treatment in the orthopedic context.
- 21453Mandibular fracture care
- Code 21453 describes closed treatment of a mandibular fracture with manipulation and interdental fixation. It is not the halo-based fixation service reported with 21100.
21100 billing questions
How does this differ from interdental fixation?
This code is for halo-based maxillofacial fixation. Code 21110 describes fixation using an interdental device, a different method.
Is removal separately reported?
Removal of the halo fixation construct is included in this service; do not report a separate removal for that work.
What postoperative care is included?
The 90-day global period includes the day-before preoperative visit and 90 days of related postoperative care.
Can modifier 50 be used?
No. Modifier 50 is inappropriate for this descriptor and anatomy.
When is assistant-at-surgery payment allowed?
CMS allows assistant-at-surgery payment only when medical necessity is documented. Co-surgeons and team surgery are not permitted.
How are other procedures in the same session paid?
The highest-valued procedure is paid in full, and other procedures are subject to the standard multiple procedure reduction.
Where these rates come from
FeeBase calculates base physician payments from CMS work, practice-expense and malpractice RVUs, adjusted by each locality’s geographic indexes and the conversion factor. Services without a published rate are labeled, never given a made-up amount. Amounts are Medicare allowed amounts before claim adjustments: not a patient’s bill or a commercial rate.
CMS RVU26D · effective Oct 1, 2026 through the day before Jan 1, 2027
Show the CMS file lines behind this rate
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