CPT 21366Surgery

Opn tx complx malar w/grft

CPT 21366 covers open surgical repair of a complex cheekbone (malar) fracture requiring bone graft material. This is an invasive procedure performed in an operating room to restore facial structure after significant trauma.

Showing rates for

National Average

Base Medicare rate

$1,248.90

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

18.6

PE RVU (NF)

16.6

MP RVU

3.41

Total RVU

38.61

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

NCCI bundling edits

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Billing tips

Document graft source and type explicitly (autograft vs allograft, donor site if autograft) in operative report to justify use of 21366 over simpler malar fracture codes
Impact: Prevents downcoding to 21365 (without graft, $831.60) - difference of $417.30 per case
Code separately for harvesting autogenous bone graft if taken from distant site (20900-20902 series) as these are not bundled with 21366
Impact: Additional $200-400 in reimbursement depending on harvest technique and site
When treating multiple facial fractures, verify NCCI edits before billing 21366 with other fracture codes; document distinct anatomic sites clearly
Impact: Avoids bundling denials; multiple facial fracture repairs can total $2000-4000 when properly documented
Submit with appropriate ICD-10 codes specifying malar fracture laterality and complexity (S02.40xA-S02.42xA series) to support medical necessity
Impact: Reduces initial denials by 30-40% and expedites clean claim processing
For bilateral cases, bill modifier 50 rather than two line items with LT/RT; most Medicare contractors prefer single line with 50
Impact: Ensures correct 150% bilateral payment without triggering duplicate claim edits
Document fracture complexity factors: comminution, displacement >5mm, orbital involvement, or zygomatic arch disruption to justify graft necessity
Impact: Strengthens medical necessity defense during audits; reduces post-payment recoupment risk

Common denials

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Frequently asked questions

What is the Medicare reimbursement rate for CPT 21366 in 2025?

The 2025 Medicare national average reimbursement for CPT 21366 is $1248.90 for both facility and non-facility settings, based on 38.61 total RVUs multiplied by the conversion factor of 32.3465.

What is the difference between CPT 21365 and 21366?

CPT 21365 covers open treatment of malar fracture without bone graft, while 21366 includes bone graft placement. The graft addition increases reimbursement by approximately $417 and requires documentation of graft source, type, and medical necessity for the additional complexity.

Can CPT 21366 be billed bilaterally with modifier 50?

Yes, when bilateral malar fractures are treated with open reduction and bone grafting on both sides during the same operative session, modifier 50 should be appended for bilateral reimbursement at approximately 150% of the base rate ($1873.35).

How many RVUs is CPT code 21366 worth in 2025?

CPT 21366 has 38.61 total RVUs in 2025, consisting of 18.6 work RVUs, 16.6 practice expense RVUs, and 3.41 malpractice RVUs. This high RVU value reflects the surgical complexity and risk.

What documentation is required to bill CPT 21366 instead of 21365?

You must document the bone graft source (autograft donor site or allograft product), graft dimensions or volume, placement technique, and clinical justification explaining why graft augmentation was necessary due to fracture complexity, bone loss, or instability.

Can I bill separately for bone graft harvesting with CPT 21366?

Yes, when autogenous bone graft is harvested from a separate distant site (not local malar area), you can bill separately using codes 20900-20902 series. However, verify payer-specific policies as some may consider local harvest included in 21366.

What modifiers are commonly used with CPT 21366?

Common modifiers include 50 (bilateral procedure), 22 (increased procedural services for unusual complexity), LT/RT (laterality), 59 (distinct procedural service when billed with other facial fractures), and 78 (return to OR during postoperative period).