CPT 21199Surgery

Reconstr lwr jaw w/advance

CPT code 21199 covers reconstructive surgery of the lower jaw (mandible) using an advancement technique. This complex procedure repositions or rebuilds the lower jaw to correct deformities, injuries, or developmental abnormalities.

Showing rates for

National Average

Base Medicare rate

$990.13

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

16.73

PE RVU (NF)

12.17

MP RVU

1.71

Total RVU

30.61

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

NCCI bundling edits

Loading bundling edits…

Billing tips

Document medical necessity with objective measurements including cephalometric analysis, sleep study results (AHI scores), or functional assessment scores to support advancement beyond cosmetic indications
Impact: Reduces denial rate by 60-75%; medical necessity denials are the primary reason for claim rejection on this high-value code
Separately bill bone graft materials and hardware (plates, screws) using appropriate supply codes when applicable, as these are not included in the surgical fee
Impact: Can add $500-$2,000 in additional reimbursement for implants and graft materials
Verify prior authorization requirements before surgery; most payers require pre-certification for mandibular reconstruction with advancement techniques
Impact: Prevents automatic denials; retrospective authorization appeals have less than 40% success rate
Use modifier 22 judiciously with detailed operative notes comparing to typical procedure when cases involve revision surgery, extensive scarring, or combined orthognathic procedures
Impact: Successful modifier 22 appeals can increase payment $200-$500 but improper use triggers audits
Bill hospital facility charges separately from professional fees; ensure surgical implants are captured on UB-04 hospital claim to maximize facility reimbursement
Impact: Facility implant charges can exceed $3,000-$8,000 depending on hardware used
Document advancement distance in millimeters and technique (bilateral sagittal split osteotomy, distraction osteogenesis, etc.) to differentiate from simpler mandibular procedures
Specific documentation prevents downcoding to lower-value mandibular procedure codes (21193-21196), protecting $200-$400 in reimbursement

Live Field Datano reports yet

Real billers contribute denial patterns and appeal strategies for this code. Once 5+ reports come in, you’ll see live aggregated data here — the only place this exists, free.

Working with CPT 21199?

Get the free Revenue Protection Toolkit — the denial triggers, modifier pitfalls, and bundling conflicts that quietly cost you reimbursement. Instant download.

Help build the field knowledge

MedPayIQ gets smarter as billers contribute. If you've had this code denied, share what happened so others learn from it. Anonymous, no patient info.

Related actions

Frequently asked questions

What is the 2025 Medicare reimbursement rate for CPT 21199?

The 2025 Medicare national average reimbursement for CPT 21199 is $990.13 for both facility and non-facility settings. This rate is based on 30.61 total RVUs (16.73 work RVU, 12.17 PE RVU, 1.71 MP RVU) multiplied by the 2025 conversion factor of 32.3465.

Does CPT 21199 require prior authorization from Medicare or commercial payers?

While Medicare does not universally require prior authorization for 21199, most commercial payers and Medicare Advantage plans require pre-certification for mandibular reconstruction procedures. Verify payer-specific requirements before scheduling surgery to avoid automatic denials.

What diagnosis codes support medical necessity for CPT 21199?

Supporting diagnoses include M26.04 (mandibular hypoplasia), G47.33 (obstructive sleep apnea with documented skeletal deficiency), S02.609A (mandibular fracture requiring reconstruction), Q75.4 (mandibulofacial dysostosis), and M26.12 (maxillary hyperplasia with mandibular deficiency). Cosmetic diagnoses will result in denial.

Can CPT 21199 be billed with other orthognathic surgery codes on the same date?

CPT 21199 may be billed with maxillary procedures (21141-21160) when performing bimaxillary orthognathic surgery, but check NCCI edits and use appropriate modifiers (59, XS) to indicate distinct procedures. Bundling with related mandibular codes (21193-21196) typically results in denial without clear documentation of separate, distinct procedures.

What documentation proves CPT 21199 is reconstructive not cosmetic?

Required documentation includes objective functional deficits: sleep study showing AHI >15 with skeletal obstruction, TMJ dysfunction measurements, inability to achieve dental occlusion, documented breathing or swallowing impairment, or congenital craniofacial diagnosis. Cephalometric analysis showing skeletal discrepancy and pre-operative functional assessment scores strengthen medical necessity.

How do you bill for bone grafts and hardware used during 21199?

Autogenous bone grafts may be separately billable using codes 20900-20902 depending on harvest site. Allogenic or synthetic grafts are typically billed as supplies. Fixation hardware (plates, screws) is included in the facility charge for hospital settings but may be separately billable in ASC settings using appropriate supply codes. Always verify payer-specific policies.

What is the global period for CPT 21199 and what services are included?

CPT 21199 has a 90-day global period. This includes pre-operative evaluation on day of or day before surgery, the procedure itself, and all routine postoperative care for 90 days including office visits, wire or appliance adjustments, and uncomplicated follow-up. Complications requiring return to OR may be separately billable with modifier 78 or 79 depending on relationship to original procedure.