Surgical · Other

Surgical reconstruction of the mandibular rami (vertical portions of the lower jaw) to correct deformity or dysfunction without the use of bone or tissue grafting material.

Verified May 8, 2026 · 6 sources ↓

Medicare: $1,108.58
Total RVUs: 33.19
Global, days: 90
Region: Other

Drawn from CMSAAPCMdclarityAaomsAAOS

Documentation requirements

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

Source · Editorial brief grounded in 6 cited references ↓

Operative note must identify the specific ramus or rami addressed (unilateral vs. bilateral) and the surgical approach used by name
Confirm explicitly that no graft material was harvested or implanted — absence of graft language is the distinction between 21193 and 21194/21195
Document the underlying diagnosis: trauma sequelae, congenital deformity, or prior surgical failure with clinical findings supporting medical necessity
Pre-op imaging (CT or panoramic radiograph) referenced in the note to justify skeletal reconstruction
If staged, document intent for return surgery in the original operative note to support modifier 58 on the subsequent claim
Record assistant surgeon's identity and role if modifier 80 or AS is appended

Applicable modifiers

Modifiers commonly billed with this code.

Source · AMA CPT modifier descriptors · CMS NCCI Policy Manual

22 Increased complexity 50 Bilateral procedure 51 Multiple procedures 58 Staged or related 62 Co-surgeons 78 Unplanned return — related 79 Unrelated during global 80 Assistant surgeon AS PA/NP/CNS assistant LT Left side RT Right side

What this code covers

Source · Editorial summary grounded in 6 cited references ↓

CPT 21193 covers open reconstruction of the mandibular rami — the perpendicular segments of the lower jaw — performed without a graft. The procedure addresses skeletal deformities of the lower jaw resulting from trauma, congenital anomaly, or prior surgical failure. Because no graft is harvested or placed, this code is distinct from 21194 and 21195, which involve autogenous bone grafting.

The 90-day global period means all routine postoperative care, including office visits, dressing changes, and hardware checks, is bundled through day 90. Any E/M visit for an unrelated condition during that window requires modifier 24. A staged follow-on procedure by the same surgeon — documented as planned in the original operative note — uses modifier 58 and resets the global clock.

This code sits at the intersection of oral and maxillofacial surgery and craniofacial reconstruction. Most volume comes from OMS and craniofacial plastic surgery practices rather than general orthopedics. Payers vary on whether this is covered under medical or dental benefit carving, so confirming the applicable benefit category before submission prevents downstream coordination-of-benefits denials.

RVU & reimbursement

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

Source · CMS Physician Fee Schedule, RVU26A · January 2026

Work RVU	18.43
Practice expense RVU	12.08
Malpractice RVU	2.68
Total RVU	33.19
Medicare national rate	$1,108.58
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	$1,108.58
HOPD (APC 5165) Hospital outpatient department	$6,048.05
ASC (PI G2) Ambulatory surgical center (freestanding)	$3,025.62

Common denial reasons

The recurring reasons claims for CPT 21193 get rejected.

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

Claim routed to dental benefit carve-out rather than medical benefit — confirm benefit category with payer before submission
Missing or vague graft exclusion language causes payer to downcode or bundle with 21194/21195
Unrelated E/M visit billed during the 90-day global without modifier 24, triggering automatic denial
Bilateral reconstruction billed as two units without modifier 50, leading to MUE edit rejection
Insufficient preoperative imaging documentation to support medical necessity for skeletal reconstruction

Frequently asked questions

Source · Generated from the editorial pipeline, verified against 6 cited references ↓

01What separates 21193 from 21194 and 21195?

The graft. 21193 is graft-free ramus reconstruction. 21194 adds autogenous bone grafting; 21195 covers reconstruction with bone grafting plus rigid fixation. If any autogenous graft is harvested and placed, 21193 is the wrong code.

02Can 21193 be billed bilaterally?

Yes. If both rami are reconstructed in the same session, append modifier 50 for bilateral procedures. Some payers instead require LT and RT on two separate line items — verify payer preference before submission.

03How does the 90-day global period affect post-op E/M billing?

All routine post-op visits are bundled through day 90. Bill an unrelated E/M with modifier 24. Bill a new, unrelated procedure during the global with modifier 79. A planned staged procedure by the same surgeon uses modifier 58, which resets the global period clock.

04Is 21193 typically covered under the medical or dental benefit?

This varies by payer and plan design. Many commercial payers carve mandibular reconstruction into dental benefits, which can mean different prior authorization pathways and fee schedules. Confirm the applicable benefit category with each payer before submitting the claim.

05When is modifier 22 appropriate for 21193?

Use modifier 22 when documented circumstances — severe post-traumatic scarring, prior hardware removal, significantly prolonged operative time — made the work substantially greater than the typical procedure. Attach a cover letter with the operative note quantifying the added complexity; payers rarely pay modifier 22 uplifts without it.

06Does site of service affect reimbursement for 21193?

Yes. HOPD and ASC payments differ materially. See the Site of Service comparison on this page for current 2026 facility rates under the CMS Physician Fee Schedule and OPPS.

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 surgical approach to the ramus, explicit confirmation that no graft was used, the laterality (left, right, or bilateral), and the underlying diagnosis driving reconstruction. That documentation chain closes the two most common audit gaps for 21193: inadvertent upcoding to a graft-inclusive code and missing laterality needed for modifier 50 or LT/RT billing.

See how Mira captures CPT 21193 documentation