CPT 21812Surgery

Treatment of rib fracture

CPT code 21812 covers the surgical treatment of rib fractures, which involves repairing broken ribs through fixation techniques. This is typically performed when conservative treatment isn't sufficient and the fracture causes severe pain, breathing problems, or chest wall instability.

Showing rates for

National Average

Base Medicare rate

$693.19

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

PE RVU (NF)

5.4

MP RVU

3.03

Total RVU

21.43

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

NCCI bundling edits

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Billing tips

Report each rib fracture repair separately with modifier 51 for multiple ribs treated during same session
Impact: Proper reporting of multiple ribs can increase total reimbursement from $693.19 for one rib to $1,039.79 for two ribs, $1,386.39 for three ribs
Always append laterality modifiers (LT/RT) as they are required for rib procedures under Medicare LCD policies
Impact: Failure to include laterality modifier results in automatic denial or suspension requiring corrected claim submission, delaying payment by 30-60 days
Document whether internal fixation devices were used (plates, screws, wire) as this supports medical necessity and higher-level billing
Impact: Detailed hardware documentation prevents downcoding and supports the 13.0 Work RVU assignment versus lower-intensity codes
Bill on same date as any associated chest tube placement or thoracotomy, but ensure distinct documentation for each procedure with modifier 59 when appropriate
Impact: Prevents bundling denials; properly separated billing can add $200-500 in additional reimbursement for associated procedures
For trauma cases, link diagnosis codes for specific rib(s) fractured (S22.31-S22.49) with seventh character for episode of care
Impact: Precise ICD-10 coding with correct episode indicator (A for initial encounter) reduces medical necessity denials by 40-50%
When performed as part of flail chest repair, document number of ribs treated and submit supporting imaging demonstrating mechanical instability
Impact: Strong documentation supporting medical necessity for surgical versus conservative treatment reduces peer-to-peer review requests and denials

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Frequently asked questions

What is the Medicare reimbursement rate for CPT 21812 in 2025?

The 2025 Medicare national average reimbursement for CPT 21812 is $693.19 for both facility and non-facility settings. This is based on a total RVU of 21.43 and the 2025 conversion factor of 32.3465.

Can I bill CPT 21812 for multiple rib fractures during the same surgery?

Yes, you can bill 21812 for each rib fracture treated with internal fixation during the same operative session. Use modifier 51 for the second and subsequent ribs. The first rib receives full payment ($693.19), while additional ribs are typically reimbursed at 50% ($346.60 each under multiple procedure rules).

What modifiers are required when billing CPT 21812?

Laterality modifiers (LT or RT) are required for CPT 21812 to indicate which side of the chest was treated. Additional modifiers may include 51 for multiple procedures, 22 for increased procedural services, 59 for distinct procedural service, or 62 for co-surgeons, depending on the specific clinical circumstances.

What documentation is needed to support medical necessity for CPT 21812?

Required documentation includes pre-operative imaging showing fracture displacement, clinical evidence of respiratory compromise or chest wall instability, documentation of failed conservative management (when applicable), detailed operative report with fixation technique and hardware used, and post-operative assessment. For flail chest cases, document mechanical instability affecting ventilation.

How many Work RVUs is CPT 21812 worth in 2025?

CPT 21812 has a Work RVU value of 13.0 in 2025, with Practice Expense RVU of 5.4 and Malpractice RVU of 3.03, totaling 21.43 RVUs. This reflects the moderate to high complexity and physician work required for surgical rib fracture fixation.

Can CPT 21812 be billed with thoracotomy or chest tube placement?

Yes, but proper modifier usage is critical. CPT 21812 can be billed with thoracotomy (32100-32160) or chest tube placement (32551) when procedures are distinct and separate. Use modifier 59 on 21812 to indicate the rib fixation was a separately identifiable service. Ensure operative documentation clearly describes each procedure as distinct with separate indications.

What are the most common denial reasons for CPT 21812?

The most common denials include lack of medical necessity documentation, inappropriate bundling with other thoracic procedures, missing laterality modifiers, and insufficient justification for surgical versus conservative treatment. To prevent denials, ensure comprehensive documentation of fracture severity, clinical compromise, and detailed operative reports with clear distinction between multiple procedures performed.