Version 2024

2024 ICD-10-CM Diagnosis Code S91.309A

Unspecified open wound, unspecified foot, initial encounter

ICD-10-CM Code:: S91.309A
ICD-10 Code for:: Unspecified open wound, unspecified foot, initial encounter
Is Billable?: Yes - Valid for Submission
Chronic Condition Indicator: ^[1]: Not chronic
Code Navigator:

Code Information
Approximate Synonyms
Clinical Classification
Coding Guidelines
Tabular List of Diseases and Injuries
Diagnostic Related Groups Mapping
Convert to ICD-9 Code
Patient Education
Other Codes Used Similar Conditions
Code History

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)

S91.309A is a billable diagnosis code used to specify a medical diagnosis of unspecified open wound, unspecified foot, initial encounter. The code is valid during the current fiscal year for the submission of HIPAA-covered transactions from October 01, 2023 through September 30, 2024.

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.

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

Clinical Classification

Clinical Category is Open wounds to limbs, initial encounter
CCSR Category Code: INJ012
Inpatient Default CCSR: Y - Yes, default inpatient assignment for principal diagnosis or first-listed diagnosis.
Outpatient Default CCSR: Y - Yes, default outpatient assignment for principal diagnosis or first-listed diagnosis.

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

S91.309A is grouped with Diagnostic Related Groups - MS-DRG Mapping

Diagnostic Related Groups (DRGs) are a classification system used to group together diagnosis codes for the purpose of reimbursement and healthcare management. DRGs are used to standardize the way hospitals and other providers are paid for inpatient services. In this system patients are grouped together based on their principal diagnosis in areas referred to as Major Diagnostic Categories (MDC). Once a patient is assigned a particular diagnostic category, providers receive a predetermined payment rate for the services rendered. This reimbursement rate is often fixed and is meant to cover the cost of care for that patient. Reimbursement is also affected by the relative weight of a diagnostic related group based on the severity of a patient's illness and the associated cost of care during hospitalization.

Diagnostic related groups encourage healthcare providers to focus on quality and efficiency in patient care while managing costs effectively. The diagnosis code is present in the following groups for version MS-DRG V41.0 applicable from 10/01/2023 through 09/30/2024.

MS-DRG	MS-DRG Title	MCD	Relative Weight
604	TRAUMA TO THE SKIN, SUBCUTANEOUS TISSUE AND BREAST WITH MCC	09	1.5062
605	TRAUMA TO THE SKIN, SUBCUTANEOUS TISSUE AND BREAST WITHOUT MCC	09	0.9088

The relative weight of a diagnostic related group determines the reimbursement rate based on the severity of a patient's illness and the associated cost of care during hospitalization.

Convert S91.309A to ICD-9-CM

ICD-9-CM Code: 892.0 - Open wound of foot
Approximate Flag - The approximate mapping means there is not an exact match between the ICD-10 and ICD-9 codes and the mapped code is not a precise representation of the original code.

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]

Other ICD-10-CM Codes Commonly Used for Similar Conditions

Filter related codes list:

S91 Open wound of ankle, foot and toes.
S91.0 Open wound of ankle.
S91.00 Unspecified open wound of ankle.
S91.001 Unspecified open wound, right ankle.
S91.001A Unspecified open wound, right ankle, initial encounter.
S91.001D Unspecified open wound, right ankle, subsequent encounter.
S91.001S Unspecified open wound, right ankle, sequela.
S91.002 Unspecified open wound, left ankle.
S91.002A Unspecified open wound, left ankle, initial encounter.
S91.002D Unspecified open wound, left ankle, subsequent encounter.
S91.002S Unspecified open wound, left ankle, sequela.
S91.009 Unspecified open wound, unspecified ankle.
S91.009A Unspecified open wound, unspecified ankle, initial encounter.
S91.009D Unspecified open wound, unspecified ankle, subsequent encounter.
S91.009S Unspecified open wound, unspecified ankle, sequela.
S91.01 Laceration without foreign body of ankle.
S91.011 Laceration without foreign body, right ankle.
S91.011A Laceration without foreign body, right ankle, initial encounter.
S91.011D Laceration without foreign body, right ankle, subsequent encounter.
S91.011S Laceration without foreign body, right ankle, sequela.
S91.012 Laceration without foreign body, left ankle.
S91.012A Laceration without foreign body, left ankle, initial encounter.
S91.012D Laceration without foreign body, left ankle, subsequent encounter.
S91.012S Laceration without foreign body, left ankle, sequela.
S91.019 Laceration without foreign body, unspecified ankle.
S91.019A Laceration without foreign body, unspecified ankle, initial encounter.
S91.019D Laceration without foreign body, unspecified ankle, subsequent encounter.
S91.019S Laceration without foreign body, unspecified ankle, sequela.
S91.02 Laceration with foreign body of ankle.
S91.021 Laceration with foreign body, right ankle.
S91.021A Laceration with foreign body, right ankle, initial encounter.
S91.021D Laceration with foreign body, right ankle, subsequent encounter.
S91.021S Laceration with foreign body, right ankle, sequela.
S91.022 Laceration with foreign body, left ankle.
S91.022A Laceration with foreign body, left ankle, initial encounter.
S91.022D Laceration with foreign body, left ankle, subsequent encounter.
S91.022S Laceration with foreign body, left ankle, sequela.
S91.029 Laceration with foreign body, unspecified ankle.
S91.029A Laceration with foreign body, unspecified ankle, initial encounter.
S91.029D Laceration with foreign body, unspecified ankle, subsequent encounter.
S91.029S Laceration with foreign body, unspecified ankle, sequela.
S91.03 Puncture wound without foreign body of ankle.
S91.031 Puncture wound without foreign body, right ankle.
S91.031A Puncture wound without foreign body, right ankle, initial encounter.
S91.031D Puncture wound without foreign body, right ankle, subsequent encounter.
S91.031S Puncture wound without foreign body, right ankle, sequela.
S91.032 Puncture wound without foreign body, left ankle.
S91.032A Puncture wound without foreign body, left ankle, initial encounter.
S91.032D Puncture wound without foreign body, left ankle, subsequent encounter.
S91.032S Puncture wound without foreign body, left ankle, sequela.
S91.039 Puncture wound without foreign body, unspecified ankle.

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.

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.

2024 ICD-10-CM Diagnosis Code S91.309A

Unspecified open wound, unspecified foot, initial encounter

Code Classification

Approximate Synonyms

Clinical Classification

Clinical Category is Open wounds to limbs, initial encounter

Coding Guidelines

S91.309A is grouped with Diagnostic Related Groups - MS-DRG Mapping

Convert S91.309A to ICD-9-CM

Patient Education

Foot Injuries and Disorders

Wounds and Injuries

Other ICD-10-CM Codes Commonly Used for Similar Conditions

Code History

Footnotes