S99 — Other and unspecified injuries of ankle and foot

Not billable

Is S99 billable?

No — S99 is a non-billable header code. S99 groups more specific codes and cannot be submitted on a claim. A valid ICD-10-CM code must be reported at the highest level of specificity available in its branch. Select one of the 60 billable codes beneath S99.

Billable codes under this header

S99 at a glance

Code	S99
Description	Other and unspecified injuries of ankle and foot
Billable	No — header code
Code set	ICD-10-CM FY2027
Valid for encounters	October 1, 2026 – September 30, 2027

Use additional code — inherited from Chapter 19

Report an additional code alongside S99 to fully describe the condition. S99 is sequenced first.

code to identify any retained foreign body, if applicable (Z18.-)

Excludes2 — not included here — inherited from Chapter 19

The conditions below are not part of S99, but a patient may have both at the same time. When documentation supports it, S99 and the excluded code may both be reported.

birth trauma (P10-P15)
obstetric trauma (O70-O71)

Excludes2 — not included here — inherited from S90-S99

The conditions below are not part of S99, but a patient may have both at the same time. When documentation supports it, S99 and the excluded code may both be reported.

burns and corrosions (T20-T32)
fracture of ankle and malleolus (S82.-)
frostbite (T33-T34)
insect bite or sting, venomous (T63.4)

What codes fall under S99? (5)

How long has S99 existed?

S99 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.

Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.