ICD-10 Code for Deep Vein Thrombosis of the Lower Extremity
The ICD-10 code for deep vein thrombosis of the lower extremity is I82.4 (Acute embolism and thrombosis of deep veins of lower extremity), with additional specificity required based on laterality and anatomic location.
Specific Code Structure
The complete ICD-10 coding for lower extremity DVT requires specification to the 5th or 6th character level:
- I82.40- Acute embolism and thrombosis of unspecified deep veins of lower extremity
- I82.41- Acute embolism and thrombosis of femoral vein
- I82.42- Acute embolism and thrombosis of iliac vein
- I82.43- Acute embolism and thrombosis of popliteal vein
- I82.44- Acute embolism and thrombosis of tibial vein
- I82.49- Acute embolism and thrombosis of other specified deep vein of lower extremity
Each of these requires an additional character for laterality:
- 1 = Right lower extremity
- 2 = Left lower extremity
- 3 = Bilateral lower extremity
- 9 = Unspecified lower extremity
Clinical Context for Accurate Coding
Proximal vs. Distal DVT matters clinically and for coding specificity. Proximal DVT (above-the-knee, involving femoral, iliac, or popliteal veins) carries significantly higher risk of pulmonary embolism (50-60% if untreated) with associated mortality of 25-30% 1. Distal DVT (below-the-knee, involving tibial veins) rarely causes pulmonary embolism and often resolves spontaneously 1.
Chronic DVT Coding
For chronic or recurrent DVT, use:
- I82.5- Chronic embolism and thrombosis of deep veins of lower extremity (with same laterality specifications)
Important Coding Caveats
ICD-10 codes have variable accuracy for DVT identification in administrative databases. Research demonstrates that ICD-10 discharge diagnosis codes have only 58% sensitivity for identifying objectively confirmed DVT 2, meaning approximately 40% of actual DVT cases may be missed when relying solely on discharge codes. This contrasts with PE codes, which show 88.9% sensitivity 2. The sensitivity is particularly lower for surgical patients and for DVT developing during hospitalization 2.
For research or quality improvement purposes using administrative data, combining principal and secondary discharge codes improves sensitivity but reduces positive predictive value 3, 4. When using ICD-10 codes for case identification, confirmatory chart review is recommended to avoid misclassification 3.
Documentation Requirements
To ensure accurate coding, clinical documentation must specify:
- Acute vs. chronic presentation
- Specific vein(s) involved (femoral, iliac, popliteal, tibial)
- Laterality (right, left, or bilateral)
- Whether DVT is provoked (with identifiable risk factors) or unprovoked
The distinction between proximal and distal DVT should be clearly documented, as this directly impacts treatment decisions regarding anticoagulation duration and intensity 1, 5.