I82.509
BillableChronic embolism and thrombosis of unspecified deep veins of unspecified lower extremity
HCC Category Mapping
V28HCC 267 — Vascular Disease
0.356V24HCC 108 — Vascular Disease
0.297ESRDHCC 108 — Vascular Disease
0.000RxHCCHCC 215 — Pulmonary Embolism and Other Vascular Disease
0.000What This Code Means
A blood clot in the deep veins of an unspecified leg that has been present for a long time, with the specific leg side not documented.
Coding Tips
- •This is the least specific code in this subcategory; use only when laterality cannot be determined from documentation
- •Query the provider if possible to determine right, left, or bilateral involvement for more accurate coding
Clinical Significance
Chronic deep vein thrombosis of the lower extremity (unspecified) indicates a long-standing thrombus that has organized within the venous system, often leading to post-thrombotic syndrome with chronic swelling, pain, and skin changes. This condition requires ongoing anticoagulation management and monitoring for recurrent thromboembolism and venous insufficiency. Accurate capture of chronic deep vein thrombosis is essential for risk adjustment as it reflects persistent vascular disease burden.
Documentation Requirements
- ✓Provider documentation explicitly stating 'chronic' deep vein thrombosis (not assumed from duration of treatment)
- ✓Clinical evidence supporting the diagnosis such as duplex ultrasound, venography, or other imaging results
- ✓Query provider for specific vein location when possible
- ✓Query provider for laterality (right, left, or bilateral) when not documented
- ✓Current treatment plan including anticoagulation therapy and duration
- ✓Assessment and monitoring notes demonstrating the condition is being actively managed
- ✓Documentation of chronicity such as 'chronic,' 'old,' 'long-standing,' or history of prior acute deep vein thrombosis that has transitioned to chronic status
Commonly Confused Codes
I82.40- — Acute embolism and thrombosis of unspecified deep veins of lower extremity; ensure chronicity is documented before using the I82.50- seriesI82.51- through I82.56- — Specific vein codes (femoral, iliac, popliteal, tibial, peroneal, calf muscular); always use the most specific code available based on documentationI80.2- — Phlebitis and thrombophlebitis of deep vessels of lower extremities; this describes vein wall inflammation with thrombosis, a different pathologyI87.01- — Postthrombotic syndrome; a distinct sequela condition that may accompany chronic deep vein thrombosis but requires separate coding
Code Hierarchy
└I82Other venous embolism and thrombosis└I82.5Chronic embolism and thrombosis of deep veins of lower extremity└I82.50Chronic embolism and thrombosis of unspecified deep veins of lower extremity└I82.509Chronic embolism and thrombosis of unspecified deep veins of unspecified lower extremity
└I82.509Chronic embolism and thrombosis of unspecified deep veins of unspecified lower extremity