S99 – Other and unspecified injuries of ankle and foot
ICD-10-CM 2027 diagnosis code · Injuries to the ankle and foot
ICD-10-CM code
S99
- Code
S99(claims format:S99)- Description
- Other and unspecified injuries of ankle and foot
- Billable
- No – use a more specific code below
- Valid for
- Dates of service October 1, 2026 – September 30, 2027 (FY2027)
- Chapter
- 19. Injury, poisoning and certain other consequences of external causes (S00-T88)
- Block
- S90-S99 Injuries to the ankle and foot
Billable codes under S99
S99 is a header code and cannot be used on claims. Choose the most specific code:
- S99.0 – Physeal fracture of calcaneusHeader (more codes below)
- S99.1 – Physeal fracture of metatarsalHeader (more codes below)
- S99.2 – Physeal fracture of phalanx of toeHeader (more codes below)
- S99.8 – Other specified injuries of ankle and footHeader (more codes below)
- S99.9 – Unspecified injury of ankle and footHeader (more codes below)
Notes inherited from parent codes
Instructional notes at a category or block level apply to every code below it.
Block S90-S99
Frequently asked questions
What is ICD-10 code S99?
S99 is the ICD-10-CM code for other and unspecified injuries of ankle and foot, in the block S90-S99 (Injuries to the ankle and foot).
Is S99 a billable code?
No. S99 is a header code with more specific child codes; report one of the billable codes listed above.
Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.