CPT 21240Surgery

Reconstruction of jaw joint

CPT code 21240 covers surgical reconstruction of the temporomandibular joint (TMJ), the hinge connecting your jawbone to your skull. This major procedure is performed when the jaw joint is severely damaged from trauma, arthritis, or developmental abnormalities.

Showing rates for

National Average

Base Medicare rate

$1,025.06

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

16.07

PE RVU (NF)

13.97

MP RVU

1.65

Total RVU

31.69

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

NCCI bundling edits

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Billing tips

Document laterality explicitly in operative report and on claim form using RT/LT modifiers; bilateral procedures require modifier 50 or submission as two line items with RT/LT
Impact: Prevents automatic denials for missing laterality information, which accounts for 15-20% of initial claim rejections for this code
Append modifier 22 with detailed letter of medical necessity when procedure involves revision of failed prosthesis, severe ankylosis requiring extensive osteotomies, or autogenous costochondral graft harvesting requiring separate incision
Impact: Can increase reimbursement by $205-$308 (20-30%) when properly documented; include operative time comparison to typical case and specific complexity factors
Separately report bone graft harvesting (CPT 20900-20902) when performed from distant site like rib or iliac crest, as this is not included in 21240 base code
Impact: Additional $200-$450 reimbursement for graft harvest codes when documentation supports separate site and significant additional work
Verify pre-authorization requirements as most commercial payers classify 21240 as requiring prior approval; submit imaging (CT/MRI), conservative treatment history, and functional assessment documentation
Impact: Prevents denials for lack of authorization which can delay payment 60-90 days or result in complete claim rejection
For total joint replacement systems, report implant costs separately using HCPCS codes or facility billing mechanisms; document specific prosthesis manufacturer and catalog numbers
Impact: Ensures proper reimbursement for high-cost implants ($8,000-$25,000) which are not included in physician professional fee

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Frequently asked questions

What is the Medicare reimbursement rate for CPT 21240 in 2025?

The 2025 Medicare national average reimbursement for CPT 21240 is $1025.06 for both facility and non-facility settings. This is based on 31.69 total RVUs (16.07 work RVU + 13.97 PE RVU + 1.65 MP RVU) multiplied by the 2025 conversion factor of 32.3465. Actual payment may vary by geographic location based on GPCI adjustments.

How do I bill CPT 21240 for bilateral TMJ reconstruction?

For bilateral TMJ reconstruction, append modifier 50 to CPT 21240 or submit two line items with RT and LT modifiers. Medicare typically pays 150% of the unilateral rate for bilateral procedures (approximately $1537.59), though some carriers may require two separate line items at 100% and 50%. Verify specific payer policy before submission.

What documentation is required to support medical necessity for CPT 21240?

Required documentation includes: comprehensive TMJ dysfunction history, objective examination findings (maximum incisal opening <25-30mm), imaging confirming joint pathology (CT/MRI showing degeneration or destruction), minimum 6 months conservative treatment failure (physical therapy, medications, splints, injections), functional impairment assessment affecting eating/speaking, and specialist evaluation supporting surgical intervention as medically necessary.

Can I bill bone graft harvesting separately with CPT 21240?

Yes, when bone graft is harvested from a distant site (rib, iliac crest, tibia) requiring a separate incision, you may report CPT 20900 (minor graft) or 20902 (major graft) in addition to 21240. However, local grafts from the surgical site are considered included. Document the specific donor site, size of graft, and separate incision to support separate billing.

What is the global period for CPT 21240?

CPT 21240 has a 90-day global period. All routine postoperative care within 90 days is included in the reimbursement. Complications or unrelated procedures during this period may be separately billable with appropriate modifiers (24 for unrelated E/M, 78 for return to OR, 79 for unrelated procedure).

How does CPT 21240 differ from CPT 21050 for TMJ procedures?

CPT 21240 (reconstruction of jaw joint) involves major reconstruction including joint recontouring, grafting, or prosthetic replacement with 31.69 RVUs. CPT 21050 (condylectomy) is a less extensive procedure involving removal of the condyle without reconstruction, valued at significantly fewer RVUs. Use 21240 when reconstruction or rebuilding of joint components is performed, not just removal or reshaping.

Do I need prior authorization for CPT 21240?

Most commercial payers require prior authorization for CPT 21240 due to the high cost and medical necessity determination complexity. Medicare does not require routine prior authorization but may conduct prepayment review. Submit imaging, conservative treatment records, functional assessment, and clinical notes supporting surgical necessity. Authorization requirements vary by payer and should be verified before scheduling.