2026 ICD-10-CM Diagnosis Code S91.109AUnspecified open wound of unspecified toe(s) without damage to nail, initial encounter

ICD-10-CM Codes›S00–T88›S90-S99›S91

ICD-10-CM S91.109A
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

S91.109A is a billable ICD-10-CM diagnosis code for unspecified open wound of unspecified toe(s) without damage to nail, initial encounter. The 7th character A marks it as an initial encounter code, used while the patient is receiving active treatment. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 604 through 605, 963 through 965. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Open wounds to limbs, initial encounter.

Code Identity

ICD-10-CM Code
S91.109A
Billable Status
Yes — Valid for Submission
Code Describes
Unspecified open wound of unspecified toe(s) without damage to nail, initial encounter
Short Description
Unsp open wound of unsp toe(s) w/o damage to nail, init
Parent Code
S91.109
Unspecified open wound of unspecified toe(s) without damage to nail

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 CodeS91.109AUnspecified open wound of unspecified toe(s) without damage to nail, initial encounter

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Glass in foot
  • Glass in toe
  • Injury of digital artery of toe
  • Injury of digital blood vessel of toe
  • Injury of digital vein of foot
  • Injury of digital vein of toe
  • Multiple fractures of foot
  • Open comminuted fracture of phalanx of toe
  • Open dislocation of metatarsophalangeal joint
  • Open division foot ligament
  • Open division interphalangeal ligament
  • Open division ligament ankle and/or foot
  • Open division metatarsophalangeal ligament
  • Open fracture dislocation of metatarsophalangeal joint
  • Open fracture dislocation of multiple metatarsophalangeal joints
  • Open fracture dislocation of single metatarsophalangeal joint
  • Open fracture of multiple phalanges of toe
  • Open fracture of phalanges of multiple toes
  • Open fracture of phalanx of left foot
  • Open fracture of phalanx of right foot
  • Open fracture subluxation of foot
  • Open fracture subluxation of multiple metatarsophalangeal joints
  • Open fracture subluxation of single metatarsophalangeal joint
  • Open injury of digital artery of toe
  • Open injury of digital vein of foot
  • Open injury of digital vein of toe
  • Open traumatic dislocation multiple digits
  • Open traumatic dislocation of joint of left foot
  • Open traumatic dislocation of joint of left toe
  • Open traumatic dislocation of joint of right foot
  • Open traumatic dislocation of joint of right toe
  • Open traumatic dislocation of single metatarsophalangeal joint
  • Open traumatic dislocation, metatarsophalangeal joint, multiple
  • Open traumatic subluxation of multiple metatarsophalangeal joints
  • Open traumatic subluxation of single metatarsophalangeal joint
  • Open wound of toe
  • Open wound of toe of left foot
  • Open wound of toe of right foot
  • Pellet wound of foot
  • Pellet wound of toe

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.

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR INJ012
Open wounds to limbs, initial encounter
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Toe Injuries and Disorders

Fourteen of the 26 bones in your feet are in your toes. The toes, particularly your big toe, help you move and keep your balance. Playing sports, running, stubbing your toe, and dropping something on your foot can damage your toes. Wearing shoes that are too loose or too tight can also cause toe problems.

Read the full article at MedlinePlus

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

Convert S91.109A to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
893.0 Open wound of toe
Approximate The match is approximate rather than exact.

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 S91.109AOverview

Is S91.109A a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report unspecified open wound of unspecified toe(s) without damage to nail, initial encounter on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What does the 7th character A in S91.109A mean?

The final character A marks the initial encounter: use it while the patient is receiving active treatment for unspecified open wound of unspecified toe(s) without damage to nail, such as an emergency visit or first evaluation.

What MS-DRG does S91.109A group to?

When unspecified open wound of unspecified toe(s) without damage to nail, initial encounter is the principal diagnosis on an inpatient stay, it groups to MS-DRG 604, 605, 963, 964, 965, with relative weights from 0.9160 to 2.7338 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of S91.109A?

Under the General Equivalence Mappings, unspecified open wound of unspecified toe(s) without damage to nail, initial encounter converts to ICD-9-CM 893.0 (open wound of toe). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.