CPT 21385Surgery

Opn tx orbit fx transantral

CPT 21385 covers surgical repair of a broken eye socket (orbital fracture) using an open approach through the maxillary sinus. The surgeon accesses the fracture site by entering through the upper jaw area to properly realign and stabilize the broken orbital bones.

Showing rates for

National Average

Base Medicare rate

$718.74

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

9.57

PE RVU (NF)

10.9

MP RVU

1.75

Total RVU

22.22

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

NCCI bundling edits

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Billing tips

Document the specific transantral approach in operative report using terms like 'Caldwell-Luc approach' or 'antrostomy' to differentiate from other orbital repair codes
Impact: Prevents downcoding to 21390-21395 (other orbital fracture codes) which may have different reimbursement; clear approach documentation supports the 22.22 RVU assignment
Verify global period (90 days) and avoid billing separately for routine postoperative visits, but do bill for unrelated E/M services with modifier 24
Impact: Prevents automatic denials for services included in global package; properly modified unrelated visits during global can add $100-300 per encounter
When performed with other facial fracture repairs, sequence codes by RVU value and apply modifier 51 appropriately to maximize reimbursement
Impact: Improper sequencing can cost 50% of secondary procedure fee; if 21385 is primary and paired with mid-face fracture repair, total reimbursement can exceed $1,200
Separately bill for surgical implants or grafts using appropriate supply codes (L8609 for orbital implants) when used for floor reconstruction
Impact: Implants not included in procedure fee; proper billing can add $500-2,000 depending on implant type and payer policy
Obtain prior authorization for all commercial payers before surgery, documenting medical necessity with imaging showing fracture size >50% orbital floor or >2mm displacement
Impact: Prior auth prevents post-service denials; retrospective denials of this code represent $718.74 loss plus appeal costs
Use CPT 70486-70488 (CT maxillofacial with 3D reconstruction) for preoperative planning and bill separately on different date of service, not day of surgery

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Frequently asked questions

What is the Medicare reimbursement rate for CPT 21385 in 2025?

The 2025 Medicare national average reimbursement for CPT 21385 is $718.74 for both facility and non-facility settings. This rate is based on a total of 22.22 RVUs (9.57 work RVU, 10.9 PE RVU, 1.75 MP RVU) multiplied by the 2025 conversion factor of 32.3465. Actual reimbursement may vary by geographic locality based on GPCI adjustments.

What is the difference between CPT 21385 and other orbital fracture repair codes?

CPT 21385 specifically describes open treatment of orbital fractures using a transantral (through the maxillary sinus) approach. This differs from 21390 (open treatment via periorbital approach), 21395 (open treatment with bone grafting), and 21400-21408 (closed treatments). The transantral approach involves accessing the orbital floor through the maxillary sinus via a Caldwell-Luc procedure, which must be clearly documented to support this specific code.

Can CPT 21385 be billed bilaterally with modifier 50?

Yes, CPT 21385 can be billed with modifier 50 when bilateral orbital fractures are repaired during the same operative session using the transantral approach on both sides. Medicare reimburses bilateral procedures at 150% of the unilateral rate ($1,078.11 total for 2025). Documentation must support medical necessity for repairing both orbits and clearly describe the procedure performed on each side.

What documentation is required to justify medical necessity for CPT 21385?

Medical necessity requires pre-operative CT imaging showing orbital fracture with significant displacement (typically >2mm) or size (>50% floor involvement), clinical findings such as diplopia, enophthalmos >2mm, restricted extraocular motility, or orbital tissue entrapment. Documentation should include forced duction testing, Hess chart results, measurements of globe position, and explanation of why conservative management is inadequate. Timing of surgery (usually 2-14 days post-injury) should also be justified.

How should CPT 21385 be coded when performed with other facial fracture repairs?

When 21385 is performed with other facial fracture procedures, list the highest RVU code first and apply modifier 51 to subsequent procedures. The primary procedure receives 100% reimbursement while additional procedures are typically reimbursed at 50%. Some combinations may require modifier 59 or XS to bypass NCCI edits. Always verify payer-specific bundling rules, as some commercial payers may have different multiple procedure reduction policies than Medicare.

What is the global period for CPT 21385 and what services are included?

CPT 21385 has a 90-day global period. This includes all routine postoperative visits, minor complications managed in-office, and removal of sutures. Services NOT included in the global package are: treatment of complications requiring return to OR (bill with modifier 78), unrelated procedures (modifier 79), unrelated E/M services (modifier 24), and treatment of new problems unrelated to the surgery. Clear documentation is essential when billing during the global period.

Can orbital implants be billed separately with CPT 21385?

Yes, orbital floor implants or grafts used during the procedure can typically be billed separately using appropriate supply codes such as L8609 (artificial cornea) or facility-specific implant codes, depending on payer. The surgical placement is included in 21385, but the implant material itself is often separately reimbursable. Verify payer policy as some commercial plans may bundle implants with the procedure code. Documentation must specify implant type, size, and medical necessity for the specific material chosen.