ICD-10 Code I80.291 – Phlebitis and thrombophlebitis of other deep vessels of right lower extremity (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I80.291 – Phlebitis and thrombophlebitis of other deep vessels of right lower extremity
What it is
This code identifies inflammation and clotting in a deep vein of the right lower leg or thigh when the vessel is not one of the specifically named deep veins. Use it for documented deep venous thrombophlebitis on the right side.
Clinical signs
Typical findings include unilateral right leg pain, swelling, tenderness, warmth, or redness. Clinical features vary; refer to documentation and imaging or provider assessment confirming a deep vein process.
When to use this code
Use I80.291 when the record clearly states phlebitis or thrombophlebitis in an unspecified “other” deep vessel of the right lower extremity. It fits cases where the provider documents a right-sided deep venous clot but does not name a more specific vein. Check documentation if laterality or vessel details are unclear.
Do not use for
Do not use this code for superficial thrombophlebitis, left-sided disease, or deep vein thrombosis in a specifically named vessel. If the chart does not support a deep venous diagnosis, check documentation.
Coding tip
Match the code to the exact vein description and laterality in the note; if the vessel is named elsewhere, code the more specific option.