2026 ICD-10-CM Diagnosis Code S91Open wound of ankle, foot and toes

ICD-10-CM Codes›S00–T88›S90-S99›S91

ICD-10-CM S91
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

S91 is a non-billable ICD-10-CM category code for open wound of ankle, foot and toes, so it cannot be submitted on claims. Use a more specific code from this category instead, such as S91.001A, S91.001D, S91.001S, and S91.002A.

Code Identity

ICD-10-CM Code
S91
Billable Status
No — Non-Billable Category
Code Describes
Open wound of ankle, foot and toes
Short Description
Open wound of ankle, foot and toes
Same as the full description in the CMS dataset.
Chapter
S90-S99
Injuries to the ankle and foot

Code Classification

ChapterS00–T88Injury, poisoning and certain other consequences of external causes
SectionS90-S99Injuries to the ankle and foot
CategoryS91Open wound of ankle, foot and toes
This CodeS91Open wound of ankle, foot and toes

Specific Coding for Open wound of ankle, foot and toesOverview

Non-specific codes like S91 require more characters. Use one of these billable codes instead:

  • S91.0 for Open wound of ankle

  • S91.00 for Unspecified open wound of ankle

  • S91.01 for Laceration without foreign body of ankle

  • S91.02 for Laceration with foreign body of ankle

  • S91.03 for Puncture wound without foreign body of ankle

  • S91.04 for Puncture wound with foreign body of ankle

  • S91.05 for Open bite of ankle

  • S91.1 for Open wound of toe without damage to nail

  • S91.10 for Unspecified open wound of toe without damage to nail

  • S91.11 for Laceration without foreign body of toe without damage to nail

  • S91.12 for Laceration with foreign body of toe without damage to nail

  • S91.13 for Puncture wound without foreign body of toe without damage to nail

  • S91.14 for Puncture wound with foreign body of toe without damage to nail

  • S91.15 for Open bite of toe without damage to nail

  • S91.2 for Open wound of toe with damage to nail

  • S91.20 for Unspecified open wound of toe with damage to nail

  • S91.21 for Laceration without foreign body of toe with damage to nail

  • S91.22 for Laceration with foreign body of toe with damage to nail

  • S91.23 for Puncture wound without foreign body of toe with damage to nail

  • S91.24 for Puncture wound with foreign body of toe with damage to nail

  • S91.25 for Open bite of toe with damage to nail

  • S91.3 for Open wound of foot

  • S91.30 for Unspecified open wound of foot

  • S91.31 for Laceration without foreign body of foot

  • S91.32 for Laceration with foreign body of foot

  • S91.33 for Puncture wound without foreign body of foot

  • S91.34 for Puncture wound with foreign body of foot

  • S91.35 for Open bite of foot

Coding GuidelinesGuidance

The appropriate 7th character is to be added to each code from block Open wound of ankle, foot and toes (S91). Use the following options for the applicable episode of care:

  • A - initial encounter
  • D - subsequent encounter
  • S - sequela

Source: ICD-10-CM Official Guidelines for Coding and Reporting, FY 2026, published by CMS and the National Center for Health Statistics.

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Code Also

  • any associated wound infection

Type 1 Excludes

  • open fracture of ankle, foot and toes S92
  • traumatic amputation of ankle and foot S98

7th Character Note

  • The appropriate 7th character is to be added to each code from category S91

7th Character

  • A - initial encounter
  • D - subsequent encounter
  • S - sequela

Patient EducationClinical

Ankle Injuries and Disorders

Your ankle bone and the ends of your two lower leg bones make up the ankle joint. Your ligaments, which connect bones to one another, stabilize and support it. Your muscles and tendons move it.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About S91Overview

Is S91 (Open wound of ankle, foot and toes) a billable code?

No. This is a category header that groups the codes for open wound of ankle, foot and toes, and headers cannot be submitted on claims. Claims for open wound of ankle, foot and toes need a more specific code from this category, such as S91.001A, S91.001D, and S91.001S.