| Billable | No — use a more specific child code |
| Chapter | Chapter 19: Injury, poisoning and certain other consequences of external causes (S00-T88) |
| Section | Injuries to the ankle and foot (S90-S99) |
| Parent code | S99 — Other and unspecified injuries of ankle and foot |
| A | initial encounter |
| D | subsequent encounter |
| S | sequela |