$905.73–$1,005.03
Choose 21100 for halo-based maxillofacial fixation. Code 21110 is for an interdental fixation device used in conditions other than fracture or dislocation.
On this page
CMS RVU26D · Effective 2026-10-01
21100 Maxillofacial fixation Medicare reimbursement rates in Massachusetts
Reports halo-based fixation to stabilize the craniofacial skeleton, including the fixation service’s removal, when performed by the treating surgeon. Compare 21100 office and facility rates across CMS payment localities in Massachusetts.
Amounts below use the non-QP conversion factor for participating physicians. These are base physician payments before claim-level adjustments, not patient costs or total hospital charges.
What does Medicare pay for 21100 in Massachusetts?
Massachusetts has 2 payment localities in this comparison. Use the service location to choose the applicable amount. These are the supported base rates for the 2 payment areas shown below, using the same CMS release.
Office / nonfacility
$654.32–$724.61
2 of 2 localities have a supported rate.
Facility setting
$339.89–$368.08
2 of 2 localities have a supported rate.
These are locality ranges, not averages or address-specific quotes. A facility-setting amount covers the physician service; it does not include a hospital’s separate bill. Choose a locality below to inspect its calculation, compare other payment areas, or price a percentage of Medicare.
Maxillofacial surgery
About 21100: Halo-based maxillofacial fixation
Reports halo-based fixation to stabilize the craniofacial skeleton, including the fixation service’s removal, when performed by the treating surgeon.
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.
CMS billing rules for 21100
- Global period
- Major surgery with a 90-day global period: the day-before preoperative visit and 90 days of related postoperative care are included.
- Multiple procedures
- Standard multiple procedure reduction: the highest-valued procedure is paid in full and others at 50% when performed in the same session.
- Bilateral procedures
- Bilateral adjustment does not apply; the descriptor or anatomy makes modifier 50 inappropriate.
- Assistant at surgery
- Assistant at surgery is paid only with documentation of medical necessity.
- Co-surgeons
- Co-surgeons not permitted.
- Team surgery
- Team surgery not permitted.
Where the value comes from
- Work RVU4.61 · 24%
- Practice expense (office) RVU13.77 · 73%
- Malpractice RVU0.51 · 3%
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 compared with similar codes
Office rates for Massachusetts, from the same CMS release.
No office rate
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.
$1,163.62–$1,294.98
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.
Compare 21100 by payment locality
Find the payment area for your service address, then open its rate page for calculation inputs, release history and the percentage-of-Medicare tool. A city may cross payment-area boundaries; the ZIP lookup above helps resolve the location.
2 of 2 payment localities
Metropolitan Boston →
Office / nonfacility
$724.61
Facility
$368.08
Rest Of Massachusetts →
Office / nonfacility
$654.32
Facility
$339.89
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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 indices and the applicable conversion factor. Unavailable or separately priced services are labeled rather than assigned a made-up amount.
Source: RVU26D. Effective 2026-10-01 through the day before 2027-01-01.
1,87121087,,Impres&prep nasal prosth,A,,24.26,21.70,,6.71,,2.76,48.72,33.73,0,090,0.10,0.69,0.21,2,0,0,0,0,9,,33.4009,09,0,99,0.00,0.00,0.00
1,87221088,,Impres&prep facial prosth,C,,0.00,0.00,,0.00,,0.00,0.00,0.00,0,090,0.10,0.69,0.21,0,0,0,0,0,9,,33.4009,09,0,99,0.00,0.00,0.00
1,87321089,,Unlisted maxlfcl prosth px,C,,0.00,0.00,,0.00,,0.00,0.00,0.00,0,YYY,0.00,0.00,0.00,0,0,1,1,1,9,,33.4009,09,0,99,0.00,0.00,0.00
1,87421100,,Maxillofacial fixation,A,,4.61,13.77,,4.83,,0.51,18.89,9.95,0,090,0.10,0.69,0.21,2,0,0,0,0,9,,33.4009,09,0,99,0.00,0.00,0.00
1,87521110,,Interdental fixation,A,,5.84,19.58,,13.65,,0.71,26.13,20.20,0,090,0.10,0.69,0.21,2,0,1,0,0,9,,33.4009,09,0,99,0.00,0.00,0.00
1,87621116,,Injection jaw joint x-ray,A,,0.79,5.75,,0.25,,0.12,6.66,1.16,0,000,0.00,0.00,0.00,2,1,1,0,0,9,,33.4009,09,0,99,0.00,0.00,0.00
1,87721120,,Genioplasty augmentation,A,,4.97,15.53,,8.74,,0.92,21.42,14.63,0,090,0.10,0.69,0.21,2,0,1,1,0,9,,33.4009,09,0,99,0.00,0.00,0.00