ICD-10-CM Code for Left Leg Skin Tear
For an open wound (skin tear) of the left lower leg, use code S81.812A (Laceration without foreign body, left lower leg, initial encounter).
Code Selection Algorithm
The appropriate ICD-10-CM code depends on three key factors:
1. Wound Depth and Characteristics
- Superficial skin tear (epidermis/dermis only): Use S80.812A (Unspecified superficial injury of left lower leg, initial encounter)
- Full-thickness skin tear (through dermis): Use S81.812A (Laceration without foreign body, left lower leg, initial encounter)
- If foreign body present: Use S81.822A (Laceration with foreign body, left lower leg, initial encounter)
2. Encounter Type (7th Character)
- A = Initial encounter (first treatment)
- D = Subsequent encounter (follow-up care during healing)
- S = Sequela (complications or late effects after healing)
3. Anatomic Location Specificity
The S81 series specifically covers the lower leg (between knee and ankle). If the skin tear involves:
- Ankle: Use S91.0- series
- Knee: Use S81.0- series
- Foot: Use S91.3- series
Clinical Documentation Requirements
To support accurate coding, document:
- Laterality: Left vs. right (mandatory in ICD-10-CM)
- Depth: Superficial vs. full-thickness
- Presence/absence of foreign body
- Mechanism of injury (add external cause code from Chapter 20)
- Encounter status: Initial, subsequent, or sequela
Common Coding Pitfalls
Avoid using "unspecified" codes when clinical information allows specificity. Research shows ICD-10 codes capture wound characteristics with 96% sensitivity when properly documented 1, compared to only 85% with ICD-9 codes.
Do not use diabetic ulcer codes (L97.-) for traumatic skin tears, even in diabetic patients—these are reserved for chronic ulcerations, not acute traumatic wounds 1.
Always add the 7th character (A, D, or S)—the code is incomplete without it and will be rejected by billing systems.