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S86.0 – ICD-10 Code: Achilles Tendon Injury
S86.0 is the ICD-10 code for an injury of the Achilles tendon. It covers tears and strains of this major tendon at the back of the lower leg.
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S86.0 is the ICD-10 code for an injury of the Achilles tendon. It covers tears and strains of this major tendon at the back of the lower leg.
What Does ICD-10 Code S86.0 Mean?
The ICD-10 code S86.0 refers to an injury of the Achilles tendon. The Achilles tendon (tendo calcaneus) is the strongest and thickest tendon in the human body. It connects the calf muscles (gastrocnemius and soleus) to the heel bone (calcaneus) and is essential for walking, running, and jumping. The code S86.0 covers injuries ranging from partial tears (partial rupture) and complete tears (complete rupture) to overuse-related strains of the Achilles tendon.
Causes
Achilles tendon injuries commonly result from:
- Sudden overload: Abrupt acceleration or change of direction during sports (e.g., soccer, tennis, basketball)
- Chronic overuse: Repetitive strain without adequate recovery periods
- Degenerative changes: Pre-existing tendon damage due to Achilles tendinopathy, often in middle-aged individuals
- Direct trauma: A blow or fall directly onto the tendon
- Medications: Certain antibiotics (fluoroquinolones) or corticosteroids can weaken tendon tissue
Symptoms
Typical signs and symptoms of an Achilles tendon injury (S86.0) include:
- Sudden, severe pain at the back of the lower leg or heel
- A sensation of being struck or hearing a pop at the moment of rupture
- Swelling and bruising around the Achilles tendon
- Reduced or absent ability to point the foot downward (plantarflexion)
- A palpable gap in the tendon in the case of a complete rupture
- Limping or inability to push off with the foot while walking
Diagnosis
Diagnosis of an Achilles tendon injury typically involves:
- Clinical examination: The Thompson test (calf squeeze test) is a key clinical assessment. In a complete rupture, squeezing the calf does not produce plantarflexion of the foot.
- Ultrasound (sonography): Visualizes partial or complete tears and fluid accumulation around the tendon
- MRI (Magnetic Resonance Imaging): Provides detailed images of the tendon, particularly in ambiguous cases or for surgical planning
- X-ray: Used to rule out associated injuries such as calcaneal fracture
Treatment
Conservative Treatment
For partial tears or patients with elevated surgical risk, conservative management may be appropriate:
- Immobilization with a cast or functional orthosis (in plantarflexion)
- Gradual functional rehabilitation with physiotherapy
- Ice, elevation, and pain relief medication in the acute phase
Surgical Treatment
For complete ruptures, especially in physically active patients, surgical repair is often recommended:
- Open surgical suture of the tendon (tendon repair)
- Minimally invasive or percutaneous suture techniques
- Post-operative rehabilitation with an orthosis and structured physiotherapy program
Rehabilitation
Rehabilitation after an Achilles tendon injury involves physiotherapy, progressive calf strengthening, and a gradual return to physical activity. Full recovery can take 3 to 12 months depending on the severity of the injury.
ICD-10 Coding and Subcategories
S86.0 belongs to the category S86 – Injury of muscle and tendon at lower leg level. The code can be further specified by additional characters to indicate the affected side (right, left) or the degree of injury. Relevant subcategories include:
- S86.00 – Injury of Achilles tendon, unspecified
- S86.01 – Strain of Achilles tendon
- S86.02 – Rupture of Achilles tendon
References
- World Health Organization (WHO): International Statistical Classification of Diseases and Related Health Problems, 10th Revision (ICD-10). Geneva: WHO; 2019. Available at: https://icd.who.int/browse10/
- Maffulli N, Ajis A, Longo UG, Denaro V: Chronic rupture of tendo Achillis. Foot Ankle Clin. 2007;12(4):583–596. doi:10.1016/j.fcl.2007.08.002.
- Soroceanu A, Sidhwa F, Aarabi S, Kaufman A, Glazebrook M: Surgical versus nonsurgical treatment of acute Achilles tendon rupture: a meta-analysis of randomized trials. J Bone Joint Surg Am. 2012;94(23):2136–2143. doi:10.2106/JBJS.K.00917.
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