CPT 21123Surgery

Geniop sldg augmentation

CPT code 21123 covers a surgical procedure to reshape and augment the chin by cutting and repositioning the jaw bone (genioplasty). This is a sliding advancement procedure that moves the chin forward or adjusts its position to improve facial structure.

Showing rates for

National Average

Base Medicare rate

$819.66

This calculator gives a typical-case estimate using standard Medicare modifier rules. Actual payment depends on payer policies, documentation, code-specific CMS status indicators, and locality. Verify before billing.

RVU breakdown

Work RVU

11.34

PE RVU (NF)

12.85

MP RVU

1.15

Total RVU

25.34

Conversion factor: 32.3465 · Source: CMS MPFS RVU25A · Confidence: High

NCCI bundling edits

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Billing tips

Document medical necessity with objective measurements (cephalometric analysis, facial photographs with measurements, occlusal relationships) to differentiate from cosmetic indications
Impact: Prevents immediate cosmetic exclusion denials which account for 40-50% of genioplasty claim rejections; medically necessary cases include sleep apnea contribution, TMJ dysfunction, or post-traumatic deformity
When billing with orthognathic surgery codes (21141-21147), document that genioplasty addresses separate anatomical deformity not corrected by jaw repositioning alone
Impact: Allows separate reimbursement for both procedures ($819.66 for 21123 plus orthognathic fee); without clear documentation, bundling reduces payment by full genioplasty amount
Bill bone graft material separately (20900-20902) only when autogenous graft harvested from separate site; alloplastic materials or local bone repositioning included in base code
Impact: Appropriate bone graft billing adds $150-400 depending on source and complexity; improper unbundling triggers NCCI edits and recoupment
Use facility place of service (POS 22 or 24) as both facility and non-facility rates are identical at $819.66, but incorrect POS code delays processing
Impact: Prevents 7-14 day claim processing delays and requests for corrected claims; unique situation where rates match due to surgical complexity requiring facility resources
Submit 3D imaging studies (70486, 70487) separately when used for surgical planning with clear documentation of how imaging changed surgical approach
Impact: Adds $200-350 for imaging studies when medical necessity established; many payers deny as investigational without specific documentation linking imaging to surgical modification

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Common denials

Cosmetic/not medically necessary - payer determines chin augmentation is for aesthetic purposes only

How to appeal: Submit appeal with cephalometric radiographs showing objective skeletal discrepancy, sleep study results if OSA component, psychological evaluation for severe dysmorphology, or documentation of functional deficit (speech, mastication). Include peer-reviewed literature supporting functional outcomes. Reference LCD L33822 (if applicable to MAC jurisdiction) or clinical policy bulletins establishing medical necessity criteria.

Bundled with orthognathic surgery (21141-21147) or other facial osteotomy codes under NCCI edits

How to appeal: Provide detailed operative report highlighting separate incision, distinct anatomical target (mentum vs. maxilla/mandible body), different osteotomy plane, and separate fixation hardware. Emphasize that chin deformity would persist despite jaw repositioning. Include pre-op analysis showing chin requires independent correction. Modifier 59 or XU may be required with documentation.

Insufficient documentation - operative report lacks detail on technique, measurements, or medical necessity

How to appeal: Resubmit with comprehensive operative report specifying: osteotomy location and dimensions, amount of advancement in millimeters, fixation method and hardware specifications, indication with pre-operative measurements, and comparison to normal anatomical parameters. Include pre-operative consultation notes establishing diagnosis and treatment plan. Attach imaging studies with annotated measurements.

Experimental/investigational - payer classifies specific technique variation or combined approach as unproven

How to appeal: Provide evidence-based literature supporting sliding genioplasty as standard of care (reference ACS, AAOMS, or ASPS guidelines). Submit comparative studies showing superiority to implant-based augmentation for osseous deficiency. Include board certification credentials and hospital privileging documentation. If novel technique used, benchmark to 21123 as closest CPT descriptor and justify approach based on patient-specific anatomy.

Frequently asked questions

What is the Medicare reimbursement rate for CPT code 21123 in 2025?

The 2025 Medicare national average reimbursement rate for CPT 21123 is $819.66 for both facility and non-facility settings. This rate is based on 25.34 total RVUs (11.34 work RVU, 12.85 PE RVU, 1.15 MP RVU) multiplied by the 2025 conversion factor of $32.3465. Actual payment may vary by geographic locality based on GPCI adjustments.

Does Medicare cover genioplasty (CPT 21123) or is it considered cosmetic?

Medicare covers CPT 21123 when medically necessary to correct functional deficits or skeletal deformities, such as sleep apnea contribution, post-traumatic deformity, or congenital mandibular deficiency affecting mastication or speech. Purely aesthetic chin augmentation is excluded. Documentation must include objective measurements (cephalometrics) and functional impact to establish medical necessity versus cosmetic intent.

Can CPT 21123 be billed with orthognathic surgery codes?

Yes, but requires careful documentation. CPT 21123 may be billed separately from orthognathic procedures (21141-21147) when genioplasty addresses a distinct chin deformity not corrected by jaw repositioning alone. The operative report must clearly document separate anatomical targets, different osteotomy planes, and independent medical necessity. Modifier 59 or XU may be required to overcome NCCI bundling edits, and many payers will scrutinize the combination.

What is the difference between CPT 21120 and 21123?

CPT 21120 describes genioplasty using an alloplastic implant (prosthetic augmentation), while CPT 21123 involves sliding osteotomy with bone repositioning and rigid fixation. Code 21123 is a more complex osseous procedure that cuts and advances the patient's own chin bone, whereas 21120 simply places an implant without bone cutting. The sliding osteotomy (21123) has higher RVUs (25.34 vs. approximately 13-15 for 21120) and is generally considered more definitive for skeletal deficiency.

What diagnosis codes support medical necessity for CPT 21123?

Primary diagnosis codes supporting 21123 include M26.09 (other specified dentofacial anomalies), M26.19 (other anomalies of jaw size), Q67.4 (congenital deformities of skull, face and jaw), M26.4 (malocclusion), and S02.69XA (fracture of mandible with chin involvement for traumatic cases). G47.33 (obstructive sleep apnea) may support when chin deficiency contributes to airway obstruction. Avoid cosmetic diagnoses like Z41.1 which trigger automatic denials.

How do I bill for revision genioplasty?

Revision genioplasty within the 90-day global period requires modifier 58 (staged procedure) if planned, or modifier 78 (return to OR for complication) if unplanned, both with CPT 21123. If complexity significantly exceeds the standard procedure due to hardware removal, bone grafting, or scar tissue, consider unlisted code 21299 with detailed documentation and benchmarking to 21123 for rate negotiation. Outside the global period, bill 21123 without modifier but document reason for revision and distinct service.

What are the RVUs for CPT code 21123 in 2025?

CPT 21123 has 25.34 total RVUs in 2025, consisting of 11.34 work RVUs, 12.85 practice expense RVUs (identical for both facility and non-facility settings), and 1.15 malpractice RVUs. The high work RVU reflects the surgical complexity of performing a horizontal osteotomy, bone repositioning, and rigid fixation with plates and screws, requiring advanced maxillofacial surgical skills.