I82.221

HCC Category Mapping

What This Code Means

A long-standing blood clot in the inferior vena cava that has persisted over time, restricting blood flow from the lower body.

Coding Tips

• •Ensure documentation clearly indicates chronic status rather than acute presentation
• •Note any complications such as post-thrombotic syndrome or collateral vein development

Clinical Significance

Chronic inferior vena cava thrombosis indicates a long-standing, organized clot in the body's largest vein, often requiring IVC filter placement or long-term anticoagulation. Patients typically develop extensive collateral circulation and remain at risk for post-thrombotic syndrome and recurrent venous thromboembolism. This diagnosis reflects ongoing high resource utilization and medical complexity important for risk adjustment.

Documentation Requirements

• ✓Clinical diagnosis of venous thrombosis or thrombophlebitis clearly documented by the treating provider
• ✓Diagnostic confirmation via duplex ultrasonography, CT venography, MR venography, or venography with imaging findings described
• ✓Current treatment plan including anticoagulation regimen with specific medication, dose, and duration
• ✓Documentation of chronic or long-standing nature of the thrombosis, including original date of diagnosis if available
• ✓Documentation of any associated central venous devices, malignancy, or precipitating factors
• ✓Documentation of bilateral lower extremity involvement and any renal function impact

Commonly Confused Codes