CPT 21600Surgery

Partial removal of rib

CPT code 21600 covers the surgical removal of part of a rib, typically performed to remove diseased tissue, access the chest cavity for other procedures, or treat rib abnormalities.

Showing rates for

National Average

Base Medicare rate

$565.74

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

7.26

PE RVU (NF)

8.53

MP RVU

1.7

Total RVU

17.49

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

NCCI bundling edits

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Billing tips

Document the specific rib number and extent of resection (e.g., '8 cm segment of 7th rib removed') to support medical necessity and differentiate from simple rib biopsy codes
Impact: Prevents downcoding to lower-value biopsy codes (21550 at lower RVUs) and reduces denial risk by 35-40%
Clearly separate documentation when 21600 is performed as surgical access versus therapeutic intent, as access procedures may be considered included in the primary procedure
Impact: Prevents bundling denials that could result in loss of the full $565.74 reimbursement when performed with thoracotomy codes
Verify LCD/NCD policies for your MAC regarding rib resection indications, as some require specific pathology documentation or pre-authorization for tumor cases
Impact: Pre-authorization compliance can prevent denials that require lengthy appeals and payment delays of 60-90 days
When billing with chest wall reconstruction codes, review NCCI edits carefully and use modifier 59 only when truly distinct procedural services at separate anatomic sites
Impact: Inappropriate modifier use triggers audits; proper use protects against recoupment demands averaging $500-800 per case
For facility billing, ensure procedure is coded as inpatient when meeting medical necessity criteria, as the facility and non-facility rates are identical at $565.74 but DRG payment differs significantly
Impact: Proper setting designation affects overall facility reimbursement through DRG assignment, potentially impacting $5,000-15,000 in total facility payment
Include photographs or surgical diagrams when available to document extent of resection for complex cases or those involving unusual anatomic considerations

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Frequently asked questions

What is the Medicare reimbursement rate for CPT 21600 in 2025?

The 2025 Medicare national average reimbursement rate for CPT 21600 is $565.74 for both facility and non-facility settings. This is based on 17.49 total RVUs (7.26 work RVU, 8.53 PE RVU, and 1.7 MP RVU) multiplied by the 2025 conversion factor of 32.3465.

Can CPT 21600 be billed with a thoracotomy code?

CPT 21600 can be billed with thoracotomy codes, but only when the rib resection is performed for a separate therapeutic purpose beyond simple surgical access. Documentation must clearly establish that the rib removal addresses distinct pathology (tumor, infection, deformity) separate from the access required for the thoracotomy. Modifier 59 may be required to indicate a distinct procedural service, and many payers will bundle this code when it appears to be incidental access.

What documentation is required to support medical necessity for partial rib removal?

Documentation must include the specific indication (osteomyelitis, tumor, trauma sequelae, pain syndrome), diagnostic imaging demonstrating rib pathology, failed conservative treatment when appropriate, specific rib identification and extent of resection, and operative findings. For tumor cases, include biopsy results or imaging characteristics. For chronic pain, document failed conservative measures over 6-12 weeks including medications, injections, and physical therapy.

How many RVUs is CPT code 21600 worth?

CPT 21600 has 17.49 total RVUs for 2025, consisting of 7.26 work RVUs, 8.53 practice expense RVUs (both facility and non-facility), and 1.7 malpractice RVUs. This relatively high RVU value reflects the complexity and surgical risk involved in partial rib resection procedures.

What is the difference between CPT 21600 and 21610?

CPT 21600 describes partial removal of a rib (segmental resection), while CPT 21610 covers complete removal of an entire rib (total rib resection). The codes differ in scope, complexity, and reimbursement, with 21610 typically valued higher due to the more extensive dissection and reconstruction required. Documentation must clearly specify whether partial or complete rib removal was performed.

Do I need a modifier when billing CPT 21600 bilaterally?

Yes, when performing partial rib removal on both sides during the same operative session, append modifier 50 (bilateral procedure) to CPT 21600. This typically results in 150% payment of the base rate when bilateral procedure rules apply. Ensure documentation clearly describes separate bilateral work and medical necessity for addressing both sides.

What are common reasons for denial of CPT 21600 claims?

Common denial reasons include lack of medical necessity documentation, bundling with primary thoracic procedures when rib resection appears to be surgical access, insufficient operative report detail regarding extent of resection, and failure to document failed conservative treatment for non-emergency indications. To prevent denials, ensure comprehensive documentation of indication, extent, and therapeutic purpose separate from any access requirements.