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ICD-10-CM diagnosis code

S99.812D Other specified injuries of left ankle, subsequent encounter

Billable
Yes, a complete code (FY2026)
Category
S99 Other and unspecified injuries of ankle and foot
Chapter
19. Injury, poisoning and certain other consequences of external causes

Encounter (7th character)

This code is for a subsequent encounter: active treatment is complete and the patient is being seen during healing or recovery (for example a cast change, medication adjustment or follow-up visit).

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Other codes in S99

414 complete codes in this category.

All 414 codes in S99 →

Documentation tips

  • Make sure the note supports every element of the title, “Other specified injuries of left ankle, subsequent encounter”: each detail in it should be traceable to the history, examination or assessment.
  • Code to the highest specificity the documentation supports. If a detail is missing from the note, add it to the note rather than choosing a less specific code by default.
  • Check the Tabular List and official guidelines for instructional notes (“code first”, “use additional code”, Excludes1/Excludes2) that apply to S99.

The international WHO ICD-10 also has S99, with its inclusion and exclusion notes; titles and detail can differ from ICD-10-CM.

ICD-10-CM is developed by the National Center for Health Statistics (NCHS), Centers for Disease Control and Prevention, U.S. Department of Health and Human Services, and is based on the WHO ICD-10. Codes and titles are reproduced unchanged from the FY2026 code list (effective 1 October 2025). Their use here does not imply endorsement by CDC, HHS or the U.S. Government. Changes effective on or after 1 October 2026 may not be reflected yet; check the current release at cdc.gov or cms.gov before submitting claims.

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