ICD-10 Code I73.1 – Thromboangiitis obliterans [Buerger’s disease] (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I73.1 – Thromboangiitis obliterans [Buerger’s disease]
What it is
I73.1 identifies thromboangiitis obliterans, also called Buerger’s disease, a nonatherosclerotic inflammatory disease that affects small and medium blood vessels. Use it when the record documents this specific diagnosis.
Clinical signs
Typical findings include limb ischemia, pain with walking or rest, coldness, color changes, and reduced pulses. Clinical features vary; refer to documentation.
When to use this code
Use I73.1 when the provider clearly documents thromboangiitis obliterans or Buerger’s disease. Code it for confirmed disease involving the extremities, especially when the note describes ischemic symptoms or vascular occlusion consistent with this diagnosis. Check documentation if the chart only says peripheral vascular disease.
Do not use for
Do not use this code for atherosclerotic peripheral arterial disease, Raynaud’s phenomenon, or nonspecific limb pain without a documented diagnosis. Check documentation.
Coding tip
Verify the exact vascular diagnosis in the assessment, not just symptoms or smoking history.