I80.222

Billable

Phlebitis and thrombophlebitis of left popliteal vein

HCC Category Mapping

V28HCC 267 — Vascular Disease

0.356

V24HCC 108 — Vascular Disease

0.297

ESRDHCC 108 — Vascular Disease

0.000

RxHCCHCC 215 — Pulmonary Embolism and Other Vascular Disease

0.000

What This Code Means

This code describes inflammation of a vein in the back of the left knee (popliteal vein) that may include a blood clot. It's a condition where the vein becomes swollen, painful, and potentially dangerous if the clot travels.

Coding Tips

•Verify laterality is documented as left; if bilateral or right popliteal vein involvement, use different codes (I80.221 for right, I80.223 for bilateral)
•Confirm whether thrombophlebitis (with clot) or phlebitis (without clot) is documented, as this affects code selection within the I80.22x family

Clinical Significance

Phlebitis and thrombophlebitis of the left popliteal vein represents deep vein thrombosis at the junction between the proximal and distal deep venous systems. The popliteal vein is generally considered a proximal vein, and thrombosis here carries meaningful risk of pulmonary embolism. It commonly occurs in the setting of immobility, surgery, or underlying hypercoagulable states, requiring anticoagulation therapy.

Documentation Requirements

✓Duplex ultrasound confirming popliteal vein thrombosis with non-compressibility and/or visible thrombus
✓Laterality — left popliteal vein documented
✓Acuity — acute, subacute, or chronic thrombosis
✓Assessment of clot extent (proximal or distal extension)
✓Evaluation for pulmonary embolism symptoms
✓Anticoagulation plan with specific agent and planned duration
✓Risk factor documentation and assessment

Commonly Confused Codes

I80.10-I80.13 — Femoral vein thrombophlebitis: more proximal vein involvement I80.23x — Tibial vein thrombophlebitis: more distal vein I87.2 — Venous insufficiency (chronic): late sequela, not acute thrombosis I80.0x — Superficial vessel thrombophlebitis: superficial, not deep M79.661-M79.669 — Pain in lower leg: symptom code, not a thrombosis diagnosis

Code Hierarchy

└I80Phlebitis and thrombophlebitis └I80.2Phlebitis and thrombophlebitis of other and unspecified deep vessels of lower extremities └I80.22Phlebitis and thrombophlebitis of popliteal vein └I80.222Phlebitis and thrombophlebitis of left popliteal vein

└I80.222Phlebitis and thrombophlebitis of left popliteal vein