2024 ICD-10-CM Diagnosis Code S91.309

Unspecified open wound, unspecified foot

ICD-10-CM Code:
S91.309
ICD-10 Code for:
Unspecified open wound, unspecified foot
Is Billable?
Not Valid for Submission
Code Navigator:

Code Classification

  • Injury, poisoning and certain other consequences of external causes
    (S00–T88)
    • Injuries to the ankle and foot
      (S90-S99)
      • Open wound of ankle, foot and toes
        (S91)

S91.309 is a non-specific and non-billable diagnosis code code, consider using a code with a higher level of specificity for a diagnosis of unspecified open wound, unspecified foot. The code is not specific and is NOT valid for the year 2024 for the submission of HIPAA-covered transactions. Category or Header define the heading of a category of codes that may be further subdivided by the use of 4th, 5th, 6th or 7th characters.

Unspecified diagnosis codes like S91.309 are acceptable when clinical information is unknown or not available about a particular condition. Although a more specific code is preferable, unspecified codes should be used when such codes most accurately reflect what is known about a patient's condition. Specific diagnosis codes should not be used if not supported by the patient's medical record.

Specific Coding Applicable to Unspecified open wound, unspecified foot

Non-specific codes like S91.309 require more digits to indicate the appropriate level of specificity. Consider using any of the following ICD-10-CM codes with a higher level of specificity when coding for unspecified open wound, unspecified foot:

  • Use S91.309A for initial encounter - BILLABLE CODE

  • Use S91.309D for subsequent encounter - BILLABLE CODE

  • Use S91.309S for sequela - BILLABLE CODE

Approximate Synonyms

The following clinical terms are approximate synonyms or lay terms that might be used to identify the correct diagnosis code:

  • Foreign body in heel
  • Fracture of base of fifth metatarsal
  • Fracture of cuboid
  • Fracture of intermediate cuneiform
  • Fracture of lateral cuneiform
  • Fracture of medial cuneiform
  • Fracture of multiple metatarsal bones
  • Fracture of multiple tarsal bones
  • Fracture of navicular
  • Glass in dorsum of foot
  • Glass in foot
  • Glass in heel
  • Glass in sole of foot
  • Gunshot wound of foot
  • Injury of deep plantar artery
  • Injury of dorsalis pedis artery
  • Multiple fractures of foot
  • Multiple fractures of foot
  • Multiple open wounds of foot
  • Nail wound of dorsum of foot
  • Nail wound of foot
  • Open comminuted fracture of metatarsal bone
  • Open division foot ligament
  • Open division ligament ankle and/or foot
  • Open division ligament ankle and/or foot
  • Open division ligament ankle and/or foot
  • Open division ligament ankle and/or foot
  • Open division of midtarsal joint ligament
  • Open division tarsometatarsal ligament
  • Open fracture dislocation of foot
  • Open fracture dislocation of midtarsal joint
  • Open fracture dislocation of midtarsal joint
  • Open fracture dislocation of subtalar joint
  • Open fracture dislocation of tarsometatarsal joint
  • Open fracture dislocation of tarsometatarsal joint
  • Open fracture metatarsal base
  • Open fracture metatarsal base
  • Open fracture metatarsal head
  • Open fracture metatarsal neck
  • Open fracture metatarsal shaft
  • Open fracture of base of fifth metatarsal
  • Open fracture of cuboid bone of foot
  • Open fracture of cuneiform bone of foot
  • Open fracture of cuneiform bone of foot
  • Open fracture of cuneiform bone of foot
  • Open fracture of cuneiform bone of foot
  • Open fracture of fifth metatarsal bone
  • Open fracture of first metatarsal bone
  • Open fracture of foot
  • Open fracture of fourth metatarsal bone
  • Open fracture of intermediate cuneiform bone of foot
  • Open fracture of lateral cuneiform bone of foot
  • Open fracture of medial cuneiform bone of foot
  • Open fracture of metaphysis of fifth metatarsal bone
  • Open fracture of metaphysis of first metatarsal bone
  • Open fracture of metaphysis of fourth metatarsal bone
  • Open fracture of metaphysis of metatarsal bone
  • Open fracture of metaphysis of metatarsal bone
  • Open fracture of metaphysis of metatarsal bone
  • Open fracture of metaphysis of metatarsal bone
  • Open fracture of metaphysis of metatarsal bone
  • Open fracture of metaphysis of metatarsal bone
  • Open fracture of metaphysis of second metatarsal bone
  • Open fracture of metaphysis of third metatarsal bone
  • Open fracture of multiple metatarsal bones
  • Open fracture of multiple tarsal bones
  • Open fracture of navicular bone of foot
  • Open fracture of second metatarsal bone
  • Open fracture of tarsal AND metatarsal bones
  • Open fracture of tarsal bone
  • Open fracture of third metatarsal bone
  • Open fracture subluxation of foot
  • Open fracture subluxation of foot
  • Open fracture subluxation of foot
  • Open fracture subluxation of midtarsal joint
  • Open fracture subluxation of subtalar joint
  • Open fracture subluxation of tarsometatarsal joint
  • Open injury, deep plantar artery
  • Open injury, dorsalis pedis artery
  • Open lateral dislocation of subtalar joint
  • Open medial dislocation of subtalar joint
  • Open traumatic dislocation of tarsometatarsal joint
  • Open traumatic dislocation of tarsometatarsal joint
  • Open traumatic dislocation of tarsometatarsal joint
  • Open traumatic dislocation of tarsometatarsal joint
  • Open traumatic dislocation, midtarsal joint
  • Open traumatic dislocation, midtarsal joint
  • Open traumatic dislocation, midtarsal joint
  • Open traumatic dislocation, midtarsal joint
  • Open traumatic dislocation, midtarsal joint
  • Open traumatic dislocation, pantalar
  • Open traumatic dislocation, pantalar
  • Open traumatic dislocation, subtalar joint
  • Open traumatic dislocation, subtalar joint
  • Open traumatic dislocation, subtalar joint
  • Open traumatic dislocation, subtalar joint
  • Open traumatic subluxation of tarsometatarsal joint
  • Open traumatic subluxation of tarsometatarsal joint
  • Open traumatic subluxation, foot
  • Open traumatic subluxation, midtarsal joint
  • Open traumatic subluxation, midtarsal joint
  • Open traumatic subluxation, midtarsal joint
  • Open traumatic subluxation, pantalar
  • Open traumatic subluxation, subtalar joint
  • Open traumatic subluxation, subtalar joint
  • Open wound foot, dorsum
  • Open wound foot, plantar
  • Open wound of foot
  • Open wound of foot except toes with complication
  • Open wound of foot except toes without complication
  • Open wound of foot with complication
  • Open wound of foot, excluding toe
  • Open wound of foot, excluding toe
  • Open wound of lower limb without complication
  • Open wound, heel
  • Traumatic arthropathy of talonavicular joint
  • Traumatic arthropathy of talonavicular joint
  • Traumatic dislocation of tarsometatarsal joint
  • Traumatic dislocation of tarsometatarsal joint
  • Traumatic dislocation of tarsometatarsal joint
  • Traumatic dislocation of tarsometatarsal joint

Coding Guidelines

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 aplicable episode of care:

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

Patient Education


Foot Injuries and Disorders

Each of your feet has 26 bones, 33 joints, and more than 100 tendons, muscles, and ligaments. No wonder a lot of things can go wrong. Here are a few common problems:

  • Bunions - hard, painful bumps on the big toe joint
  • Corns and calluses - thickened skin from friction or pressure
  • Plantar warts - warts on the soles of your feet
  • Fallen arches - also called flat feet

Ill-fitting shoes often cause these problems. Aging and being overweight also increase your chances of having foot problems.


[Learn More in MedlinePlus]

Wounds and Injuries

An injury is damage to your body. It is a general term that refers to harm caused by accidents, falls, hits, weapons, and more. In the U.S., millions of people injure themselves every year. These injuries range from minor to life-threatening. Injuries can happen at work or play, indoors or outdoors, driving a car, or walking across the street.

Wounds are injuries that break the skin or other body tissues. They include cuts, scrapes, scratches, and punctured skin. They often happen because of an accident, but surgery, sutures, and stitches also cause wounds. Minor wounds usually aren't serious, but it is important to clean them. Serious and infected wounds may require first aid followed by a visit to your doctor. You should also seek attention if the wound is deep, you cannot close it yourself, you cannot stop the bleeding or get the dirt out, or it does not heal.

Other common types of injuries include:

  • Animal bites
  • Bruises
  • Burns
  • Dislocations
  • Electrical injuries
  • Fractures (broken bones)
  • Sprains and strains

[Learn More in MedlinePlus]

Code History

  • FY 2024 - No Change, effective from 10/1/2023 through 9/30/2024
  • FY 2023 - No Change, effective from 10/1/2022 through 9/30/2023
  • FY 2022 - No Change, effective from 10/1/2021 through 9/30/2022
  • FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016. This was the first year ICD-10-CM was implemented into the HIPAA code set.