CPT 21138Surgery

Rdctj forehead cntrg&prostc

CPT code 21138 covers surgical reduction and contouring of the forehead bones with placement of a prosthetic implant, typically performed to reshape the frontal bone structure of the skull.

Showing rates for

National Average

Base Medicare rate

$897.94

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

12.87

PE RVU (NF)

12.53

MP RVU

2.36

Total RVU

27.76

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

NCCI bundling edits

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Billing tips

Document medical necessity thoroughly for non-cosmetic indications, including congenital deformities, trauma history, or functional impairment
Impact: Prevents automatic denial as cosmetic; difference between $0 and $897.94 reimbursement for medically necessary cases
Submit detailed operative report showing both reduction osteotomies AND prosthetic placement; if only one component performed, use different code
Impact: Code 21138 specifically requires both reduction and prosthetic components; missing documentation can result in downcoding to lower-paying codes like 21139 ($658.24)
For gender-affirming surgery, verify prior authorization requirements and ensure diagnosis codes support medical necessity per WPATH guidelines
Impact: Many payers now cover when criteria met, but require F64.0/F64.1 diagnoses and letters from mental health professionals; lack of pre-authorization causes immediate denial
Bill facility and professional components separately when performed in hospital setting; surgeon bills professional component only
Impact: Both facility and non-facility rates are $897.94 for 21138; ensure facility bills separately for OR time, implants, and supplies to maximize total reimbursement
Code prosthetic materials separately when payer allows; custom implants may qualify for additional reimbursement under device codes
Impact: Some payers allow separate payment for custom prosthetics beyond the CPT reimbursement; verify policy before billing to capture additional $500-$3,000
Use modifier 22 with documentation showing operative time exceeding 3+ hours or unusual complexity; include percentage increase requested

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Frequently asked questions

What is the CPT code 21138 used for?

CPT 21138 is used for surgical reduction and contouring of the forehead bone (frontal bone) with simultaneous placement of a prosthetic implant. This craniofacial procedure reshapes the forehead contour through bone reduction and augmentation with prosthetic material.

How much does Medicare pay for CPT 21138 in 2025?

Medicare pays $897.94 for CPT 21138 in 2025 based on the national average rate. Both the facility and non-facility rates are the same at $897.94, with a total RVU value of 27.76.

Is CPT 21138 covered by insurance for gender-affirming surgery?

Coverage varies by payer and state. Many commercial insurers and some state Medicaid programs now cover 21138 for gender-affirming facial feminization when medical necessity criteria are met, including appropriate diagnoses (gender dysphoria), mental health evaluations, and adherence to WPATH Standards of Care. Prior authorization is typically required.

What documentation is required to bill CPT 21138?

Required documentation includes detailed operative notes describing both the frontal bone reduction technique (osteotomies and fixation) and prosthetic placement, preoperative CT imaging, medical necessity justification, prosthetic specifications, and total operative time. Both components (reduction AND prosthetic) must be clearly documented.

Can CPT 21138 be billed with other craniofacial procedures?

Yes, but bundling rules apply. When billed with other craniofacial codes, modifier 51 typically reduces payment for the secondary procedure. Use modifier 59 or XS when procedures are distinct and separate. Review NCCI edits to identify bundling restrictions with specific code combinations.

What is the difference between CPT 21138 and 21139?

CPT 21138 includes both reduction of the frontal bone AND placement of a prosthetic implant, while 21139 describes reduction of the forehead without prosthetic placement. Code selection depends on whether prosthetic augmentation is performed; 21138 has higher reimbursement due to the additional prosthetic component.

What are common reasons for CPT 21138 claim denials?

Common denials include: deemed cosmetic/not medically necessary, lack of prior authorization, insufficient documentation of both reduction and prosthetic components, and bundling with other procedures. Appeals require comprehensive medical necessity documentation, complete operative reports, and supporting clinical evidence.