S86.809S Unspecified injury of other muscle(s) and tendon(s) at lower leg level, unspecified leg, sequela

ICD-10-CM S86.809S: Unspecified injury of other muscle(s) and tendon(s) at lower leg level, unspecified leg, sequela

ICD-10-CM code S86.809S is an active, billable diagnosis representing an unspecified injury of other muscles and tendons at the lower leg level on an unspecified leg, sequela. It is classified under the semantic type of Injury or Poisoning and has a parent concept of S86.809. [S1, S4, S5] 1 4 5

Plain-language overview

The official terminology record for S86.809S pairs the phrase unspecified injury of other muscles and tendons at the lower leg level with the designations unspecified leg and sequela. [S1] 1

What this code represents

The terminology record classifies this diagnosis concept under the semantic type of Injury or Poisoning, specifically denoting a sequela of an unspecified lower leg muscle and tendon injury. [S1, S4] 1 4

Coding details

S86.809S is a billable code with an active record status, and it exists as a narrower concept under the parent code S86.809 for unspecified lower leg muscle and tendon injuries. [S1, S5] 1 5

Terminology listings include both S86.809S and S86.809D as distinct codes under the same unspecified lower leg muscle and tendon injury concept. [S3, S4] 3 4

Documentation considerations

The official display label for S86.809S includes the terms unspecified injury and unspecified leg, along with a published abbreviation of unsp inj musc/tend at lower leg level, unsp leg, sequela. [S1] 1

Clinical context

Clinical text notes that lower extremity trauma involving muscle injury can lead to ongoing muscle necrosis and delayed sequelae, which may require interventions like soft tissue releases or tendon transfers. [S2] 2

What the sources add

While terminology records establish the code hierarchy and definitions, clinical text provides operational context regarding the severe sequelae of lower extremity muscle injuries, including potential necrosis and surgical management. [S1, S2] 1 2

Coverage and utilization context

A billing agency source lists S86.809S as a billable code, providing operational context for claim submission alongside other related muscle and tendon injury codes. [S5] 5

Questions to verify

Reviewers may need to verify the exact definitions and payer-specific rules governing the use of the sequela character for S86.809S, as the supplied terminology sources do not provide these instructions. [S1] 1

Sources

1. ICD-10-CM S86.809S terminology record — National Cancer Institute Enterprise Vocabulary Services; accessed 2026-07-27.
2. Bookshelf — ncbi.nlm.nih.gov; accessed 2026-07-27.
3. EVS Explore — evsexplore.semantics.cancer.gov; accessed 2026-07-27.
4. EVS Explore — evsexplore.semantics.cancer.gov; accessed 2026-07-27.
5. Codigo. The #1 Billing Agency for Medical Practices — codigo.care; accessed 2026-07-27.