CPT 21390Surgery

Opn tx orbit periorbtl implt

CPT 21390 covers an open surgical procedure to place an implant on or around the periosteum (bone covering) of the orbit, the bony socket that holds the eye. This is typically performed to restore orbital volume or contour after trauma, tumor removal, or congenital deformities.

Showing rates for

National Average

Base Medicare rate

$780.52

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

11.23

PE RVU (NF)

11.45

MP RVU

1.45

Total RVU

24.13

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

NCCI bundling edits

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Billing tips

Document the exact location and type of periosteal implant material used (silicone, porous polyethylene, custom-molded implant) with dimensions and manufacturer details
Impact: Prevents denials for insufficient documentation; supports medical necessity and differentiates from unlisted codes; reduces audit risk by 40-50%
Clearly distinguish 21390 from CPT 67550 (orbital implant following enucleation) by documenting that the globe remains in place and the implant is periosteal, not within Tenon's capsule
Impact: Prevents incorrect code substitution; 67550 pays differently and has different global period; avoids $200-400 payment variance from miscoding
Verify that orbital floor or wall fracture repair (21385-21387) is not more appropriate; 21390 is specifically for implant placement, not primary fracture reduction with grafts
Impact: Correct code selection between 21385 ($706.89) and 21390 ($780.52) ensures appropriate reimbursement; prevents upcoding allegations
Bill supply code C1776 or C1780 separately for the implant device when performed in facility setting if hospital does not include in charge
Impact: Captures additional reimbursement for costly implant materials ($500-2,000 depending on implant type); coordinate with facility billing to avoid duplication
For Medicare patients, ensure the diagnosis code clearly supports medical necessity (traumatic deformity, congenital anomaly, post-surgical defect) rather than cosmetic indications
Impact: Prevents outright denials for cosmetic exclusion; medical necessity documentation is critical for $780.52 payment; cosmetic denials are difficult to overturn

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Frequently asked questions

What is the Medicare reimbursement rate for CPT 21390 in 2025?

The 2025 Medicare national average reimbursement for CPT 21390 is $780.52 for both facility and non-facility settings. This rate is based on 24.13 total RVUs multiplied by the 2025 conversion factor of 32.3465. Actual payment may vary by MAC jurisdiction and geographic location.

What is the difference between CPT 21390 and 67550 for orbital implants?

CPT 21390 is for periosteal implant placement when the eye remains in place, typically for volume restoration or contour correction. CPT 67550 is specifically for insertion of an implant following enucleation or evisceration when the eye has been removed. The anatomic location and clinical context are distinctly different, making correct code selection critical.

Can CPT 21390 be billed bilaterally with modifier 50?

Yes, CPT 21390 can be billed with modifier 50 when bilateral orbital periosteal implants are placed during the same operative session. Medicare typically reimburses bilateral procedures at 150% of the unilateral rate, which would be $1,170.78 for bilateral 21390. Verify payor-specific bilateral surgery policies before billing.

What diagnosis codes support medical necessity for CPT 21390?

Common supporting diagnoses include orbital wall fracture sequelae (S02.3xxS series), congenital orbital deformity (Q75.0-Q75.2), post-surgical orbital defect (M95.0), enophthalmos due to trauma (H05.401-H05.409), and orbital volume deficiency. Cosmetic diagnoses or facial asymmetry without functional impairment typically result in denial.

How many RVUs is CPT code 21390 worth in 2025?

CPT 21390 has 24.13 total RVUs in 2025, consisting of 11.23 work RVUs, 11.45 practice expense RVUs (both facility and non-facility), and 1.45 malpractice RVUs. This high RVU value reflects the complexity and surgical risk of orbital periosteal implant procedures.

What modifiers are most commonly used with CPT 21390?

The most common modifiers for 21390 are LT/RT for laterality specification (required for unilateral procedures), modifier 50 for bilateral procedures, modifier 22 for increased procedural complexity in difficult cases, and modifier 59/XS for distinct procedural services when performed with other orbital procedures. Modifier 78 is used for related returns to the OR during the global period.

Is prior authorization required for CPT 21390?

Prior authorization requirements vary by insurance carrier. Most commercial insurers and Medicare Advantage plans require prior authorization for CPT 21390 due to the surgical nature and cost. Traditional Medicare does not require prior authorization but does review medical necessity post-claim. Always verify specific payor requirements before scheduling to avoid denials.