ICD-10 Code I82.449 – Acute embolism and thrombosis of unspecified tibial vein (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I82.449 – Acute embolism and thrombosis of unspecified tibial vein
What it is
This code identifies an acute clot or embolus in a tibial vein of the lower leg when the specific side or vessel detail is not documented. It refers to an active venous thrombotic event, not a chronic or historical finding.
Clinical signs
Clinical features may include unilateral leg pain, swelling, warmth, tenderness, or a sense of fullness in the calf. Diagnosis is usually supported by imaging or other documentation of acute venous thrombosis; clinical features vary, refer to documentation.
When to use this code
Use this code when the record documents an acute embolism or thrombosis in an unspecified tibial vein and does not name right or left side. It fits confirmed lower-leg venous clotting when the provider has not specified a more precise tibial vein location. If laterality or a different vein is documented, code that specific entry instead.
Do not use for
Do not use it for chronic, old, or resolved thrombosis, or for superficial vein disease. Check documentation if the clot is in a different deep vein, if laterality is known, or if the note uses only suspected DVT without confirmation.
Coding tip
Match the code to the exact vein named in the chart and verify that “acute” is documented before assigning I82.449.