ICD-10-CM 2027 diagnosis code

S99Other and unspecified injuries of ankle and foot

Not billable — use a more specific code

S99 is a header code, so it can't be reported by itself. Choose one of the 5 more specific codes beneath it.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About S99

S99 is the ICD-10-CM diagnosis code for other and unspecified injuries of ankle and foot. It belongs to block S90-S99 (injuries to the ankle and foot) and chapter 19 (injury, poisoning and certain other consequences of external causes). It is a header code, so it can't be reported by itself; one of its 5 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: S99.0 (calcaneus), S99.1 (metatarsal), S99.2 (toe), S99.8 (foot) and S99.9 (foot).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Specific codes under S99

Notes that apply from higher levels

Instructions written at a parent level also apply to S99.

Broader instructions also apply from S90-S99 Injuries to the ankle and foot and Chapter 19: Injury, poisoning and certain other consequences of external causes.

Codes whose notes reference S99

S89Excludes2

Code history

2016
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2021
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2025
2026
2027

FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
No changes since FY2016.

Common questions about S99

Is S99 billable?: No. S99 is a header code. Report one of its more specific subcodes instead.