CPT 21182Surgery

Reconstruct cranial bone

CPT code 21182 covers surgical reconstruction of the cranial bone (skull), typically performed to repair defects from trauma, tumor removal, or congenital conditions. This is a complex procedure involving reshaping or rebuilding portions of the skull to protect the brain and restore normal anatomy.

Showing rates for

National Average

Base Medicare rate

$2,060.80

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

32.58

PE RVU (NF)

25.16

MP RVU

5.97

Total RVU

63.71

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

NCCI bundling edits

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Billing tips

Document the exact size and location of cranial defect in square centimeters and anatomical landmarks, as well as type of graft material used (autogenous bone, titanium mesh, PEEK implant, etc.)
Impact: Prevents downcoding to less complex repair codes (21180-21181) that reimburse $500-800 less; complete documentation supports medical necessity
When using alloplastic materials or custom implants, separately report supply codes (e.g., C1734 for orthopedic/device/drug matrix) to capture material costs not included in 21182
Impact: Can add $1,000-5,000+ in additional reimbursement depending on implant type; requires itemized invoice and NDC/HCPCS codes
Consider modifier 22 for cases involving prior infection, radiation, multiple previous surgeries, or defects >25 cm² requiring extensive grafting
Impact: Can increase payment by $400-600 with proper documentation comparing actual work to typical procedure; include operative time and specific complexity factors
Bill separately for any simultaneous dural repair (61618) or duraplasty if performed, as this represents distinct work beyond bone reconstruction
Impact: 61618 adds approximately $700-900 when medically necessary and documented; ensure both procedures are clearly distinguished in operative note
Verify that imaging studies (CT/MRI) and preoperative planning are documented within 30 days of surgery, as payers often require evidence of surgical planning
Impact: Prevents denial for lack of medical necessity; preoperative imaging documentation strengthens appeal success rate by 60-70%
For cranioplasty following previous craniectomy, ensure the medical record clearly documents the interval between procedures and reason for staged approach

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Frequently asked questions

What is the Medicare reimbursement rate for CPT 21182 in 2025?

The 2025 Medicare national average reimbursement for CPT 21182 is $2,060.80 for both facility and non-facility settings, based on 63.71 total RVUs and the conversion factor of 32.3465. Actual payment may vary by geographic locality and contractor.

Can CPT 21182 be billed with a craniotomy code on the same date of service?

Yes, but it depends on the clinical circumstances. If the cranial reconstruction addresses a separate defect from a previous surgery, it can be billed separately with modifier 59. However, if performed as part of the same craniotomy for initial access, it may be considered bundled. Documentation must clearly show distinct procedures.

What is the difference between CPT 21182 and 21181?

CPT 21181 describes reconstruction of the cranial bone with a contour irregularity, while 21182 involves reconstruction for a cranial defect. Code 21182 typically involves more extensive work including bone grafting or implant placement to fill a structural defect, whereas 21181 addresses contour abnormalities without true bone loss.

How long is the global period for CPT 21182?

CPT 21182 has a 90-day global surgical period. This means routine postoperative care for 90 days following surgery is included in the payment, and separate E/M services during this period typically cannot be billed unless unrelated to the surgery or qualifying for modifier 24.

What documentation is required to bill modifier 22 with CPT 21182?

To support modifier 22, documentation must include detailed operative report explaining specific complexity factors beyond typical procedure, comparative statement of usual versus actual work, increased operative time with specific start/stop times, anatomical challenges, unexpected findings, and quantification of additional effort. A cover letter summarizing these elements should accompany the claim.

Is CPT 21182 covered for cosmetic cranioplasty procedures?

Medicare and most payers only cover CPT 21182 when medically necessary for functional reconstruction, not purely cosmetic purposes. Coverage requires documentation of functional impairment such as brain protection, headache relief, or psychological distress from significant deformity. Purely aesthetic skull contouring is typically excluded.

Can I bill separately for the bone graft material when performing CPT 21182?

Autogenous bone harvest from a separate site (e.g., rib, iliac crest) can be billed separately using appropriate codes (20900-20902). However, alloplastic materials like titanium mesh or PEEK implants should be reported using supply codes (C-codes or appropriate HCPCS) rather than additional CPT codes. Check payer policies as some may include materials in the surgical fee.