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  2. ICD-10-CM Index
  3. Chapter: S00–T98
  4. Section: S90-S99
  5. Block: S91
  6. S91.309A - Unspecified open wound, unspecified foot, initial encounter

2022 ICD-10-CM Code S91.309A
Unspecified open wound, unspecified foot, initial encounter

Version 2022
Billable Code
7th Character Code
Unspecified Code
Initial Code
MS-DRG Mapping
ICD-10:S91.309A
Short Description:Unspecified open wound, unspecified foot, initial encounter
Long Description:Unspecified open wound, unspecified foot, initial encounter
Status: Valid for Submission

Code Classification

  • Injury, poisoning and certain other consequences of external causes (S00–T98)
    • Injuries to the ankle and foot (S90-S99)
      • Open wound of ankle, foot and toes (S91)

S91.309A is a billable diagnosis code used to specify a medical diagnosis of unspecified open wound, unspecified foot, initial encounter. The code S91.309A is valid during the fiscal year 2022 from October 01, 2021 through September 30, 2022 for the submission of HIPAA-covered transactions.

The ICD-10-CM code S91.309A might also be used to specify conditions or terms like foreign body in heel, fracture of cuboid, fracture of intermediate cuneiform, fracture of lateral cuneiform, fracture of medial cuneiform , fracture of navicular, etc.

S91.309A is an initial encounter code, includes a 7th character and should be used while the patient is receiving active treatment for a condition like unspecified open wound unspecified foot. According to ICD-10-CM Guidelines an "initial encounter" doesn't necessarily means "initial visit". The 7th character should be used when the patient is undergoing active treatment regardless if new or different providers saw the patient over the course of a treatment. The appropriate 7th character codes should also be used even if the patient delayed seeking treatment for a condition.

Unspecified diagnosis codes like S91.309A 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.

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:

Approximate Synonyms

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

Convert S91.309A to ICD-9 Code

The General Equivalency Mapping (GEM) crosswalk indicates an approximate mapping between the ICD-10 code S91.309A its ICD-9 equivalent. The approximate mapping means there is not an exact match between the ICD-10 code and the ICD-9 code and the mapped code is not a precise representation of the original code.

Information for Patients


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:

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


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Code History

  • 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 (First year ICD-10-CM implemented into the HIPAA code set)

Previous Code: S91.309

Parent Code: S91.309

Next Code: S91.309D