CPT 21813Surgery

Treatment of rib fracture

CPT code 21813 is used when a surgeon surgically repairs a broken rib, typically involving internal fixation with plates, screws, or other hardware to stabilize the fractured bone.

Showing rates for

National Average

Base Medicare rate

$949.69

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

17.61

PE RVU (NF)

7.26

MP RVU

4.49

Total RVU

29.36

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

NCCI bundling edits

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Billing tips

Document the specific number of ribs fixed and the exact hardware used (plates, screws, intramedullary devices) in the operative report
Impact: Prevents denials for lack of medical necessity and supports modifier 22 claims for complex cases; can justify additional $190-$475 reimbursement
Code 21813 is per rib fracture treated; verify payer policy on whether to bill multiple units or separate line items when fixing multiple ribs in one session
Impact: Billing correctly for multiple ribs can increase reimbursement from $949.69 to $2,849.07 or more for 3+ ribs, depending on payer policy
Capture and separately bill for chest tube placement (32551) or thoracoscopy (32601-32665) when performed for independent indications, not as part of exposure
Impact: Additional $200-$800 in reimbursement when appropriately unbundled with modifier 59 and proper documentation
Use modifier 22 with detailed documentation when treating flail chest requiring fixation of 4+ ribs or when significant tissue reconstruction is required
Impact: Can increase reimbursement by $190-$475 (20-50%) with supporting documentation of increased complexity and operative time
Verify if the procedure is performed in facility vs non-facility setting, though both have the same Medicare rate of $949.69 for this code
Impact: While Medicare rates are equal, understanding setting ensures proper claim submission and may affect private payer reimbursement
Document medical necessity clearly, including failed conservative management, respiratory compromise, or specific indications for surgical fixation versus observation

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Frequently asked questions

What is the Medicare reimbursement rate for CPT 21813 in 2025?

The 2025 Medicare national average reimbursement for CPT 21813 is $949.69 for both facility and non-facility settings, based on 29.36 total RVUs and the 2025 conversion factor of 32.3465.

Can I bill CPT 21813 for multiple rib fractures repaired during the same surgery?

Yes, but billing methodology varies by payer. Some allow multiple units of 21813 (one per rib fixed), while others require a single code with modifier 22 for increased complexity. Medicare and most payers require you to verify their specific policy on multiple rib fixations. Always document each rib separately in the operative report.

What modifiers are most commonly used with CPT code 21813?

The most common modifiers are 22 (increased procedural services for complex cases with 4+ ribs), 50 (bilateral procedure), RT/LT (laterality), and 59 (distinct procedural service when unbundling from other chest procedures). Modifier 22 requires detailed documentation of additional complexity to justify increased reimbursement.

What documentation is required to prevent denials for CPT 21813?

Required documentation includes specific rib numbers and laterality, clinical indication for surgery (flail chest, displacement, respiratory compromise), evidence of failed conservative management, type and quantity of hardware used, pre/post-operative imaging, operative report with reduction technique, and respiratory function assessments. High-quality documentation reduces denial rates significantly.

Is rib fracture fixation covered by Medicare and commercial insurance?

Yes, Medicare covers CPT 21813 when medically necessary, typically for flail chest, severely displaced fractures, or symptomatic non-unions. Commercial payers increasingly cover rib fixation based on growing evidence, though some still require prior authorization or have specific medical necessity criteria. Always verify coverage before scheduling.

How many RVUs is CPT 21813 worth in 2025?

CPT 21813 has 29.36 total RVUs in 2025, consisting of 17.61 work RVUs, 7.26 practice expense RVUs (both facility and non-facility), and 4.49 malpractice RVUs. This relatively high RVU value reflects the surgical complexity and risk of rib fracture fixation.

What are common denial reasons for CPT 21813 and how do I appeal them?

Common denials include lack of medical necessity (appeal with documentation of failed conservative treatment and clinical indications), bundling with other thoracic procedures (appeal with modifier 59 and distinct anatomic documentation), and experimental/investigational designations (appeal with current clinical guidelines from AAST or EAST). Each denial type requires specific documentation and evidence in the appeal.