Surgical · Other

Reconstruction of the mandibular rami using a horizontal, vertical, C, or L osteotomy, with bone graft harvested from the patient (graft procurement included).

Verified May 8, 2026 · 6 sources ↓

Medicare: $1,279.59
Total RVUs: 38.31
Global, days: 90
Region: Other

Drawn from CMSAAPCLouisianahealthconnectEmednyAAOS

Documentation requirements

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

Source · Editorial brief grounded in 6 cited references ↓

Specify osteotomy configuration by name: horizontal, vertical, C, or L — vague references to 'mandibular osteotomy' invite downcoding
Document the indication for reconstruction: trauma sequelae, congenital deformity, or functional impairment with supporting clinical findings
Confirm autograft harvest site (e.g., iliac crest, mandibular symphysis) and describe graft procurement in the operative note — procurement is bundled, but must be documented
Record skeletal maturity status for elective orthognathic cases; most payers require it for medical necessity determination
Document failure or inadequacy of non-surgical management when required by payer prior authorization criteria
Note any unusual anatomic complexity, prior surgical scarring, or complicating factors if modifier 22 is appended

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 59 Distinct service 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 6 cited references ↓

CPT 21194 covers surgical reconstruction of the mandibular rami — the vertical portions of the lower jaw — via osteotomy (horizontal, vertical, C, or L configuration) with autogenous bone graft. Graft harvesting is bundled into the code; do not separately report procurement. The procedure is typically performed to correct skeletal deformities resulting from trauma, congenital malformation, or prior failed reconstruction. It pairs with 21193 (same osteotomy, no graft) as its without-graft counterpart.

This is a 90-day global procedure. That window covers the day-before visit, the surgery, and all routine post-op management through day 90. E/M visits for new or unrelated problems during that period require modifier 24. If the decision for surgery is made at the same encounter as the pre-op evaluation, append modifier 57 to the E/M code — required for any major (90-day global) procedure.

Billing is dominated by oral and maxillofacial surgeons. Payer medical necessity criteria vary: most commercial plans follow AAOMS orthognathic surgery criteria, requiring documented functional impairment, failure of non-surgical management, and skeletal maturity. Verify prior authorization requirements before scheduling — this is a high-dollar elective reconstruction that many payers flag for pre-service review.

RVU & reimbursement

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

Source · CMS Physician Fee Schedule, RVU26A · January 2026

Work RVU	21.27
Practice expense RVU	13.97
Malpractice RVU	3.07
Total RVU	38.31
Medicare national rate	$1,279.59
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	$1,279.59
HOPD (APC 5165) Hospital outpatient department	$6,048.05
ASC (PI J8) Ambulatory surgical center (freestanding)	$3,833.49

Common denial reasons

The recurring reasons claims for CPT 21194 get rejected.

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

Cosmetic exclusion: payer denies as not medically necessary when documentation fails to establish functional impairment (malocclusion, airway compromise, pain)
Missing or denied prior authorization — high-dollar orthognathic procedures are routinely subject to pre-service review by commercial payers
Separate billing of bone graft procurement alongside 21194 — harvesting is included in the code descriptor and will be bundled or denied
ICD-10 mismatch: diagnosis code reflects cosmetic or aesthetic concern rather than functional skeletal pathology
Skeletal immaturity for elective cases — some payers deny when documentation does not confirm growth completion

Frequently asked questions

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

01Is bone graft harvesting separately billable with 21194?

No. The code descriptor explicitly includes obtaining the graft. Separately reporting a graft harvest code alongside 21194 will be bundled or denied under NCCI edits.

02What is the difference between 21193 and 21194?

21193 covers the same mandibular rami osteotomy configurations (horizontal, vertical, C, or L) without bone graft. 21194 is used when autogenous bone graft is required and harvested. Choose based on what was actually performed — do not upcode to 21194 if no graft was taken.

03Does 21194 require prior authorization?

Most commercial payers require prior authorization for orthognathic reconstruction procedures. Authorization criteria typically follow AAOMS guidelines: documented functional impairment, skeletal maturity, and failure of non-surgical management. Verify payer-specific requirements before scheduling.

04How is an E/M visit billed on the day before surgery for a 21194 case?

Append modifier 57 to the E/M code when the decision for surgery is made at that visit. Modifier 57 is required for major procedures (90-day global) to allow separate payment for the pre-surgical evaluation.

05Can 21194 be billed with modifier 62 when two surgeons are involved?

Yes, if two surgeons with distinct skills each perform distinct portions of the procedure. Both surgeons append modifier 62 and submit separate claims with operative notes documenting each surgeon's contribution. Payer acceptance of co-surgery billing varies — confirm before assuming payment.

06What ICD-10 codes support medical necessity for 21194?

Functional diagnoses drive approval: malocclusion (M26.2x), mandibular asymmetry (M26.11), post-traumatic deformity of jaw (M27.69), and sequelae of facial fractures are commonly accepted. Cosmetic-sounding diagnoses without functional correlation are the primary basis for medical necessity denials.

07If a staged second-phase mandibular procedure is planned after 21194, which modifier applies?

Use modifier 58 for a staged or related procedure by the same surgeon during the 90-day global period. Document the intent for staging in the initial operative note. Modifier 58 resets the global period clock from the date of the subsequent procedure.

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 osteotomy configuration (horizontal, vertical, C, or L), the graft harvest site and technique, the clinical indication with functional impairment details, and any complicating anatomic factors from dictation. This prevents the two most common audit flags: an operative note that names only 'mandibular osteotomy' without specifying geometry, and a diagnosis that reads as cosmetic rather than functional — both of which trigger medical necessity denials.

See how Mira captures CPT 21194 documentation