ICD-10-CM Code for Left Leg Hamstring Tear
For a left leg hamstring tear, use S76.012A (Strain of muscle, fascia and tendon of left thigh, initial encounter).
Understanding the Code Structure
The appropriate ICD-10-CM code depends on several clinical factors that must be documented:
Key Documentation Requirements
Encounter Type (7th Character):
- A = Initial encounter (first treatment for acute injury)
- D = Subsequent encounter (ongoing treatment)
- S = Sequela (late effects/complications)
Laterality Specification:
- The code must specify left (2) versus right (1) side 1, 2
- In ICD-10-CM, left is always designated by "2" in the laterality position 1, 2
Specific Code Selection
S76.012A is the primary code for:
- Acute hamstring muscle strain/tear
- Left thigh
- Initial encounter for treatment
Alternative codes if different injury pattern:
- S76.312A - Strain of muscle, fascia and tendon of the posterior muscle group at thigh level, left thigh, initial encounter (more specific for posterior thigh/hamstring group)
- S76.322A - Laceration of muscle, fascia and tendon of the posterior muscle group at thigh level, left thigh (if open injury)
Clinical Context for Code Selection
While the provided evidence focuses primarily on imaging evaluation and surgical management rather than coding specifics 3, the hamstring injury literature confirms these are common athletic injuries requiring accurate documentation 4, 5.
Important Coding Considerations
Severity documentation matters:
- Partial versus complete tear should be documented clinically
- However, ICD-10-CM does not have separate codes for partial vs complete hamstring tears - both use the same strain code
- The degree of injury (grade 1-3) is captured in clinical documentation but not in separate ICD-10 codes
Anatomic specificity:
- Proximal hamstring avulsion injuries use the same S76 series codes
- Distal insertional injuries may require different codes if at the knee level (S86 series)
Common Pitfalls to Avoid
Do not use unspecified codes when laterality is known - always specify left (2) versus right (1) 1, 2
Placeholder X requirement: If a code requires a 7th character but is not 6 characters long, use placeholder X to fill empty positions 1, 2
Avoid "other fracture" or nonspecific codes - research shows these comprise 45% of EMR codes but only 6% should be nonspecific 6
Initial vs subsequent encounter: The 7th character must accurately reflect whether this is the first treatment (A) or follow-up care (D)
Practical Application
For a patient presenting with an acute left hamstring tear on their first visit:
- Primary code: S76.012A or S76.312A (more specific for posterior thigh group)
- Add external cause code (Y93.xx for activity) if relevant for injury surveillance
- Document clinical severity separately in medical record
The accuracy of ICD-10 coding varies significantly by institution (72-100% accuracy reported) 7, so verify your facility's coding practices and consider clinical documentation improvement initiatives to ensure accurate capture of injury details.