Contrast x-ray of knee joint
CPT code 73580 covers a contrast x-ray of the knee joint, where contrast dye is injected into the knee to make structures like cartilage, ligaments, and joint surfaces more visible on x-ray images. This procedure helps diagnose problems inside the knee that regular x-rays might miss.
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
Conversion factor: 32.3465 · Source: CMS MPFS RVU25A · Confidence: High
NCCI bundling edits
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Billing tips
Always append laterality modifiers (RT/LT) as most payers including Medicare require anatomic specificity for knee procedures
Impact: Prevents automatic denials and resubmission delays; reduces claim processing time by 7-14 days
Document medical necessity explaining why arthrography was chosen over standard radiography or why MRI was contraindicated or insufficient
Impact: Reduces denial rate by approximately 30-40% for medical necessity reviews; particularly important as MRI has largely replaced conventional arthrography
Verify that contrast injection procedure (20610 or 27370) is not separately billable with 73580 as it is included in the arthrography procedure
Impact: Prevents unbundling denials and potential fraud flags; bundling issues can result in 100% denial of the incorrectly billed injection code
For bilateral procedures, check payer policy on modifier 50 versus two line items with RT/LT modifiers before submitting
Impact: Ensures correct payment of approximately $156.72 for bilateral procedures rather than risking denial or underpayment of second side
When splitting professional and technical components, ensure both providers document their respective services and use correct modifiers (26/TC)
Impact: Prevents component denials and payment delays; incorrect component billing can reduce reimbursement by 50% or more
Include ICD-10 codes that clearly support the need for arthrography rather than standard imaging, such as specific meniscal tear codes or joint instability
Impact: Strengthens medical necessity; can reduce prior authorization denials by 25-35% and expedite claims processing
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