Surgical · Other

Surgical reconstruction of a lower jaw (mandibular) segment, typically involving osteotomy and repositioning or rebuilding of bone to correct deformity from trauma, disease, or congenital origin.

Verified May 8, 2026 · 5 sources ↓

Medicare: $908.84
Total RVUs: 27.21
Global, days: 90
Region: Other

Drawn from CMSAAPCMdclarity

Documentation requirements

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

Source · Editorial brief grounded in 5 cited references ↓

Specify the mandibular segment(s) involved (e.g., symphysis, body, ramus, condyle)
Name the surgical approach used — do not write 'standard approach' without detail
Document whether bone grafting was performed and, if so, the graft source and size
Describe fixation method (plates, screws, wires) and hardware specifications
State the underlying diagnosis driving reconstruction: trauma, tumor, congenital deformity, or other
Include preoperative imaging findings and functional impairment that establish medical necessity
Document intraoperative findings that confirm or modify the planned procedure

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 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

What this code covers

Source · Editorial summary grounded in 5 cited references ↓

CPT 21198 covers mandibular segment reconstruction — a procedure in which the surgeon cuts and repositions or rebuilds a portion of the lower jaw to correct structural abnormality. Indications include post-traumatic deformity, tumor resection defects, congenital jaw misalignment, and acquired skeletal discrepancies. The work involves precise osteotomy planning, bone repositioning or grafting, and rigid fixation. It carries a 90-day global period, meaning all routine postoperative management through day 90 is bundled into the base payment.

This code is predominantly billed by oral and maxillofacial surgeons. Orthopedic and craniofacial surgeons performing mandibular reconstruction should confirm their MAC's specialty-specific coverage policies, as some payers scrutinize claims from specialties outside the typical billing pattern. Operative documentation must specify the segment(s) involved, the surgical approach, fixation method, and whether bone grafting was performed — each of these details directly affects medical necessity review.

When the reconstruction is substantially more complex than the typical case — for example, due to prior failed repairs, severe scarring, or multilevel involvement — modifier 22 is appropriate with a detailed operative note explaining the excess work. If a second surgeon actively participates, modifier 80 applies. Unplanned return to the OR for a related complication within the 90-day global uses modifier 78; an unrelated procedure in the same window uses modifier 79.

RVU & reimbursement

Component RVUs and Medicare national rate. Actual payment varies by GPCI locality.

Source · CMS Physician Fee Schedule, RVU26A · January 2026

Work RVU	15.32
Practice expense RVU	9.88
Malpractice RVU	2.01
Total RVU	27.21
Medicare national rate	$908.84
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	$908.84
HOPD (APC 5165) Hospital outpatient department	$6,048.05
ASC (PI R2) Ambulatory surgical center (freestanding)	$3,025.62

Common denial reasons

The recurring reasons claims for CPT 21198 get rejected.

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

Medical necessity not established — operative note lacks diagnosis-specific functional impairment documentation
Operative note describes approach and fixation too vaguely to distinguish reconstructive from routine repair work
Modifier 22 submitted without an attached explanation of what made the case substantially more complex
Prior authorization not obtained for elective reconstructive mandibular procedures, which many commercial payers require
Specialty mismatch — claim flagged when billed by a specialty outside typical oral/maxillofacial billing patterns without supporting documentation

Frequently asked questions

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

01What distinguishes 21198 from other mandibular reconstruction codes?

21198 covers reconstruction of a lower jaw segment — work that goes beyond simple fracture repair or reduction. The distinction turns on whether the procedure involves rebuilding or repositioning bone to correct deformity, not merely stabilizing a fresh fracture.

02Can modifier 22 be used with 21198 for a particularly complex case?

Yes. Use modifier 22 when the work is substantially greater than typical — prior failed reconstruction, severe scarring, multilevel involvement, or unusually difficult anatomy all qualify. Attach a written explanation to the claim; payers routinely deny modifier 22 without it.

03How does the 90-day global period affect billing in this case?

The 90-day global bundles all routine post-op care through day 90. Separately billing office visits for wound checks, suture removal, or hardware monitoring in that window will deny unless you append modifier 24 to document that the visit was for an unrelated condition.

04Is prior authorization typically required for 21198?

Most commercial payers require prior authorization for elective mandibular reconstruction. Confirm PA status before scheduling. Medicare does not have a universal PA requirement for this code, but individual MACs may apply local coverage policies — check your MAC's LCD database.

05Can 21198 be billed with bone graft codes on the same date?

Bone graft harvest and preparation codes may be separately reportable if the graft work is performed at a distinct site and the payer's NCCI edits allow it. Verify current NCCI procedure-to-procedure edits before appending modifier 59 or XS — do not assume separability without checking.

06What site-of-service difference exists between HOPD and ASC for 21198?

There is a meaningful payment differential between the HOPD and ASC facility rates for this code. If your practice has ASC access, site-of-service selection can affect facility reimbursement substantially — see the Site of Service comparison table on this page for current 2026 figures.

Sources & references

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

Mira AI Scribe

Mira's AI scribe captures the mandibular segment involved, the surgical approach by name, fixation hardware used, bone graft source and dimensions if applicable, and the specific diagnosis driving reconstruction — all pulled from dictation. That prevents the two most common audit flags: a vague operative note that can't survive medical necessity review, and a modifier 22 claim submitted without documented justification for the excess complexity.

See how Mira captures CPT 21198 documentation