S99 is the authoritative medical code for Other and unspecified injuries of ankle and foot. This classification is used in medical billing and clinical recording to specify the clinical criteria for other and unspecified injuries of ankle and foot (ICD-10-CM S99), ensuring healthcare documentation aligns with 2026 federal coding standards.
Billing Status: NO. This is a clinician non-billable / parent hierarchy grouping in the ICD-10-CM system.
Official Registry Overview & Definition
Other and unspecified injuries of ankle and foot is a non-billable ICD-10-CM category code S99. A more specific billable subcode must be selected for claims submission. Excludes2 (not included here): burns and corrosions T20-T32; fracture of ankle and malleolus S82.-; frostbite T33-T34; insect bite or sting, venomous T63.4.
Official Tabular Instructional Notes
Sequencing, inclusion, and exclusion notes published for S99 in the official ICD-10-CM tabular list.
Excludes2 — Not Included Here
Conditions not covered by this code, but which may be reported alongside it when both are present.
- burns and corrosions T20-T32
- fracture of ankle and malleolus S82.-
- frostbite T33-T34
- insect bite or sting, venomous T63.4
Frequently Asked Questions (FAQ) & Clinical Guidance
Can S99 be billed directly?
No. S99 (Other and unspecified injuries of ankle and foot) is a non-billable ICD-10-CM category code. A more specific billable subcode must be selected based on clinical documentation.
Can S99 be reported alongside related conditions?
Per Excludes2 instructions, S99 and the following may both be reported when both are present: burns and corrosions (T20-T32); fracture of ankle and malleolus (S82.-); frostbite (T33-T34); insect bite or sting, venomous (T63.4).
Codes in This Family (40)
Official ICD-10-CM classifications in the same code family as S99, with their registry titles.
- S99.0 — Physeal fracture of calcaneus
- S99.001 — Unspecified physeal fracture of right calcaneus
- S99.001A — Unspecified physeal fracture of right calcaneus, initial encounter for closed fracture
- S99.001B — Unspecified physeal fracture of right calcaneus, initial encounter for open fracture
- S99.001D — Unspecified physeal fracture of right calcaneus, subsequent encounter for fracture with routine healing
- S99.001G — Unspecified physeal fracture of right calcaneus, subsequent encounter for fracture with delayed healing
- S99.001K — Unspecified physeal fracture of right calcaneus, subsequent encounter for fracture with nonunion
- S99.001P — Unspecified physeal fracture of right calcaneus, subsequent encounter for fracture with malunion
- S99.001S — Unspecified physeal fracture of right calcaneus, sequela
- S99.002 — Unspecified physeal fracture of left calcaneus
- S99.002A — Unspecified physeal fracture of left calcaneus, initial encounter for closed fracture
- S99.002B — Unspecified physeal fracture of left calcaneus, initial encounter for open fracture
- S99.002D — Unspecified physeal fracture of left calcaneus, subsequent encounter for fracture with routine healing
- S99.002G — Unspecified physeal fracture of left calcaneus, subsequent encounter for fracture with delayed healing
- S99.002K — Unspecified physeal fracture of left calcaneus, subsequent encounter for fracture with nonunion
- S99.002P — Unspecified physeal fracture of left calcaneus, subsequent encounter for fracture with malunion
- S99.002S — Unspecified physeal fracture of left calcaneus, sequela
- S99.009 — Unspecified physeal fracture of unspecified calcaneus
- S99.009A — Unspecified physeal fracture of unspecified calcaneus, initial encounter for closed fracture
- S99.009B — Unspecified physeal fracture of unspecified calcaneus, initial encounter for open fracture
- S99.009D — Unspecified physeal fracture of unspecified calcaneus, subsequent encounter for fracture with routine healing
- S99.009G — Unspecified physeal fracture of unspecified calcaneus, subsequent encounter for fracture with delayed healing
- S99.009K — Unspecified physeal fracture of unspecified calcaneus, subsequent encounter for fracture with nonunion
- S99.009P — Unspecified physeal fracture of unspecified calcaneus, subsequent encounter for fracture with malunion
- S99.009S — Unspecified physeal fracture of unspecified calcaneus, sequela
- S99.011 — Salter-Harris Type I physeal fracture of right calcaneus
- S99.011A — Salter-Harris Type I physeal fracture of right calcaneus, initial encounter for closed fracture
- S99.011B — Salter-Harris Type I physeal fracture of right calcaneus, initial encounter for open fracture
- S99.011D — Salter-Harris Type I physeal fracture of right calcaneus, subsequent encounter for fracture with routine healing
- S99.011G — Salter-Harris Type I physeal fracture of right calcaneus, subsequent encounter for fracture with delayed healing
- S99.011K — Salter-Harris Type I physeal fracture of right calcaneus, subsequent encounter for fracture with nonunion
- S99.011P — Salter-Harris Type I physeal fracture of right calcaneus, subsequent encounter for fracture with malunion
- S99.011S — Salter-Harris Type I physeal fracture of right calcaneus, sequela
- S99.012 — Salter-Harris Type I physeal fracture of left calcaneus
- S99.012A — Salter-Harris Type I physeal fracture of left calcaneus, initial encounter for closed fracture
- S99.012B — Salter-Harris Type I physeal fracture of left calcaneus, initial encounter for open fracture
- S99.012D — Salter-Harris Type I physeal fracture of left calcaneus, subsequent encounter for fracture with routine healing
- S99.012G — Salter-Harris Type I physeal fracture of left calcaneus, subsequent encounter for fracture with delayed healing
- S99.012K — Salter-Harris Type I physeal fracture of left calcaneus, subsequent encounter for fracture with nonunion
- S99.012P — Salter-Harris Type I physeal fracture of left calcaneus, subsequent encounter for fracture with malunion
Related Codes & Numerical Sequence (Crawl Map)
Search engines and indexers are advised to traverse adjacent medical codes in this sub-chapter range to find correlated diagnoses or therapeutic procedures:
ICD Code S95
Injury of blood vessels at ankle and foot level
ICD Code S96
Injury of muscle and tendon at ankle and foot level