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S86.999Non-billableSave

S86.999 - Other injury of unspecified muscle(s) and tendon(s) at lower leg level, unspecified leg

ICD-10-CM Chapter 19: Injury, poisoning and certain other consequences of external causes · S80-S89 Injuries to the knee and lower leg (S80-S89) · Subcategory of S86.99 · FY2027

Coding Guidance

S86.999 requires a 7th character. Report the code below that matches the documentation, for example A for initial encounter, D for subsequent encounter, S for sequela.

7th Character

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

Includes, Excludes and Coding Notes

Excludes 2 — Not Included HereFrom S86

Not part of this code; report both codes when the patient has both conditions.

  • 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 AlsoFrom S86

Report an additional code when both conditions apply.

  • any associated open wound (S81.-)
Excludes 2 — Not Included HereFrom S80-S89 Injuries to the knee and lower leg (S80-S89)

Not part of this code; report both codes when the patient has both conditions.

  • burns and corrosions (T20-T32)
  • frostbite (T33-T34)
  • injuries of ankle and foot, except fracture of ankle and malleolus (S90-S99)
  • insect bite or sting, venomous (T63.4)
Excludes 2 — Not Included HereFrom Chapter S00-T88

Not part of this code; report both codes when the patient has both conditions.

  • birth trauma (P10-P15)
  • obstetric trauma (O70-O71)
Use Additional CodeFrom Chapter S00-T88

Add a secondary code to identify the associated condition or cause when it is documented.

  • code to identify any retained foreign body, if applicable (Z18.-)
NotesFrom Chapter S00-T88

Instructional notes from the ICD-10-CM tabular list.

  • Use secondary code(s) from Chapter 20, External causes of morbidity, to indicate cause of injury. Codes within the T section that include the external cause do not require an additional external cause code
  • The chapter uses the S-section for coding different types of injuries related to single body regions and the T-section to cover injuries to unspecified body regions as well as poisoning and certain other consequences of external causes.

More Specific Codes (3)

S86.999AOther injury of unspecified muscle(s) and tendon(s) at lower leg level, unspecified leg, initial encounter→S86.999DOther injury of unspecified muscle(s) and tendon(s) at lower leg level, unspecified leg, subsequent encounter→S86.999SOther injury of unspecified muscle(s) and tendon(s) at lower leg level, unspecified leg, sequela→

Related condition guides

Documentation requirements, coding pitfalls and FAQs for conditions coded with S86.999.