ICD-10 Code I80.201 – Phlebitis and thrombophlebitis of unspecified deep vessels of right lower extremity (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I80.201 – Phlebitis and thrombophlebitis of unspecified deep vessels of right lower extremity
What it is
This code identifies inflammation and clotting in an unspecified deep vein of the right lower leg. Use it when the record confirms deep vein involvement on the right but does not specify a named vessel.
Clinical signs
Typical findings include unilateral right-leg pain, swelling, warmth, tenderness, or redness. Clinical features vary; refer to documentation, and confirm that the affected vessel is deep and on the right side.
When to use this code
Use I80.201 when the provider documents phlebitis or thrombophlebitis in an unspecified deep vein of the right lower extremity. It also fits when imaging or assessment supports deep venous thrombosis with inflammation, but the exact vein is not named. Do not guess the vessel if documentation is incomplete.
Do not use for
Do not use this code for superficial thrombophlebitis, left-sided disease, or unspecified lower-extremity laterality. If the chart does not clearly identify a deep vein, check documentation.
Coding tip
Verify laterality and depth first; if either is missing, query the provider before assigning I80.201.