S86.129A Laceration of other muscle(s) and tendon(s) of posterior muscle group at lower leg level, unspecified leg, initial encounter

Billable ICD-10-CM code, FY2026.

Built from S86.129 with 7th character A (initial encounter).

Applies from S86 Injury of muscle, fascia and tendon at lower leg level

Excludes2 (not included here)

• injury of muscle, fascia and tendon at ankle (S96.-)
• injury of patellar ligament (tendon) (S76.1-)
• sprain of joints and ligaments of knee (S83.-)

Code also

• any associated open wound (S81.-)

7th character note

• The appropriate 7th character is to be added to each code from category S86

7th character required

• A — initial encounter
• D — subsequent encounter
• S — sequela

Medicare Code Edits (MCE v43.1 (April 2026))

• Unspecified code (laterality): Unspecified codes for which a more specific code identifying laterality (right, left, bilateral) exists within the same code family.

Code annotations containing back-references to S86.129A

Back-references to S86

• Type 2 Excludes: M23 Internal derangement of knee ("current injury - see injury of knee and lower leg (S80-S89)")
• Type 2 Excludes: S76 Injury of muscle, fascia and tendon at hip and thigh level ("injury of muscle, fascia and tendon at lower leg level (S86)")
• Type 2 Excludes: S83 Dislocation and sprain of joints and ligaments of knee ("strain of muscle, fascia and tendon of lower leg (S86.-)")

Nearby codes

• S86.122 Laceration of other muscle(s) and tendon(s) of posterior muscle group at lower leg level, left leg
• S86.122A Laceration of other muscle(s) and tendon(s) of posterior muscle group at lower leg level, left leg, initial encounter
• S86.122D Laceration of other muscle(s) and tendon(s) of posterior muscle group at lower leg level, left leg, subsequent encounter
• S86.122S Laceration of other muscle(s) and tendon(s) of posterior muscle group at lower leg level, left leg, sequela
• S86.129 Laceration of other muscle(s) and tendon(s) of posterior muscle group at lower leg level, unspecified leg
• S86.129A Laceration of other muscle(s) and tendon(s) of posterior muscle group at lower leg level, unspecified leg, initial encounter (this code)
• S86.129D Laceration of other muscle(s) and tendon(s) of posterior muscle group at lower leg level, unspecified leg, subsequent encounter
• S86.129S Laceration of other muscle(s) and tendon(s) of posterior muscle group at lower leg level, unspecified leg, sequela
• S86.19 Other injury of other muscle(s) and tendon(s) of posterior muscle group at lower leg level
• S86.191 Other injury of other muscle(s) and tendon(s) of posterior muscle group at lower leg level, right leg
• S86.191A Other injury of other muscle(s) and tendon(s) of posterior muscle group at lower leg level, right leg, initial encounter