S86.999Header code — not billable

Other injury of unspecified muscle(s) and tendon(s) at lower leg level, unspecified leg

Short description: Inj unsp musc/tend at lower leg level, unsp leg

Chapter
19. Injury, poisoning and certain other consequences of external causes
Category
S86
Effective date
October 1, 2026

Related codes in category S86

S86Injury of muscle, fascia and tendon at lower leg levelS86.0Injury of Achilles tendonS86.00Unspecified injury of Achilles tendonS86.001Unspecified injury of right Achilles tendonS86.001AUnspecified injury of right Achilles tendon, init encntrYesS86.001DUnspecified injury of right Achilles tendon, subs encntrYesS86.001SUnspecified injury of right Achilles tendon, sequelaYesS86.002Unspecified injury of left Achilles tendonS86.002AUnspecified injury of left Achilles tendon, init encntrYesS86.002DUnspecified injury of left Achilles tendon, subs encntrYesS86.002SUnspecified injury of left Achilles tendon, sequelaYesS86.009Unspecified injury of unspecified Achilles tendon

Frequently asked questions

What is ICD-10 code S86.999?

S86.999 is an ICD-10-CM diagnosis code for Other injury of unspecified muscle(s) and tendon(s) at lower leg level, unspecified leg.

Is S86.999 a billable code?

No. S86.999 is a category/header code, not billable on its own — use one of its more specific child codes instead.

What ICD-10-CM chapter is S86.999 in?

S86.999 falls under Chapter 19: Injury, poisoning and certain other consequences of external causes.

When did S86.999 become effective?

S86.999 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.

What other codes are related to S86.999?

S86.999 belongs to category S86, which includes 12 other codes — see the related codes list on this page.

ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.