2024 ICD-10-CM Diagnosis Code T25.4

Corrosion of unspecified degree of ankle and foot

ICD-10-CM Code:
T25.4
ICD-10 Code for:
Corrosion of unspecified degree of ankle and foot
Is Billable?
Not Valid for Submission
Code Navigator:

Code Classification

  • Injury, poisoning and certain other consequences of external causes
    (S00–T88)
    • Burns and corrosions of external body surface, specified by site
      (T20-T25)
      • Burn and corrosion of ankle and foot
        (T25)

T25.4 is a non-specific and non-billable diagnosis code code, consider using a code with a higher level of specificity for a diagnosis of corrosion of unspecified degree of ankle and 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 T25.4 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 Corrosion of unspecified degree of ankle and foot

Non-specific codes like T25.4 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 corrosion of unspecified degree of ankle and foot:

  • T25.41 for Corrosion of unspecified degree of ankle - NON-BILLABLE CODE

  • T25.411 for Corrosion of unspecified degree of right ankle - NON-BILLABLE CODE

  • Use T25.411A for initial encounter - BILLABLE CODE

  • Use T25.411D for subsequent encounter - BILLABLE CODE

  • Use T25.411S for sequela - BILLABLE CODE

  • T25.412 for Corrosion of unspecified degree of left ankle - NON-BILLABLE CODE

  • Use T25.412A for initial encounter - BILLABLE CODE

  • Use T25.412D for subsequent encounter - BILLABLE CODE

  • Use T25.412S for sequela - BILLABLE CODE

  • T25.419 for Corrosion of unspecified degree of unspecified ankle - NON-BILLABLE CODE

  • Use T25.419A for initial encounter - BILLABLE CODE

  • Use T25.419D for subsequent encounter - BILLABLE CODE

  • Use T25.419S for sequela - BILLABLE CODE

  • T25.42 for Corrosion of unspecified degree of foot - NON-BILLABLE CODE

  • T25.421 for Corrosion of unspecified degree of right foot - NON-BILLABLE CODE

  • Use T25.421A for initial encounter - BILLABLE CODE

  • Use T25.421D for subsequent encounter - BILLABLE CODE

  • Use T25.421S for sequela - BILLABLE CODE

  • T25.422 for Corrosion of unspecified degree of left foot - NON-BILLABLE CODE

  • Use T25.422A for initial encounter - BILLABLE CODE

  • Use T25.422D for subsequent encounter - BILLABLE CODE

  • Use T25.422S for sequela - BILLABLE CODE

  • T25.429 for Corrosion of unspecified degree of unspecified foot - NON-BILLABLE CODE

  • Use T25.429A for initial encounter - BILLABLE CODE

  • Use T25.429D for subsequent encounter - BILLABLE CODE

  • Use T25.429S for sequela - BILLABLE CODE

  • T25.43 for Corrosion of unspecified degree of toe(s) (nail) - NON-BILLABLE CODE

  • T25.431 for Corrosion of unspecified degree of right toe(s) (nail) - NON-BILLABLE CODE

  • Use T25.431A for initial encounter - BILLABLE CODE

  • Use T25.431D for subsequent encounter - BILLABLE CODE

  • Use T25.431S for sequela - BILLABLE CODE

  • T25.432 for Corrosion of unspecified degree of left toe(s) (nail) - NON-BILLABLE CODE

  • Use T25.432A for initial encounter - BILLABLE CODE

  • Use T25.432D for subsequent encounter - BILLABLE CODE

  • Use T25.432S for sequela - BILLABLE CODE

  • T25.439 for Corrosion of unspecified degree of unspecified toe(s) (nail) - NON-BILLABLE CODE

  • Use T25.439A for initial encounter - BILLABLE CODE

  • Use T25.439D for subsequent encounter - BILLABLE CODE

  • Use T25.439S for sequela - BILLABLE CODE

  • T25.49 for Corrosion of unspecified degree of multiple sites of ankle and foot - NON-BILLABLE CODE

  • T25.491 for Corrosion of unspecified degree of multiple sites of right ankle and foot - NON-BILLABLE CODE

  • Use T25.491A for initial encounter - BILLABLE CODE

  • Use T25.491D for subsequent encounter - BILLABLE CODE

  • Use T25.491S for sequela - BILLABLE CODE

  • T25.492 for Corrosion of unspecified degree of multiple sites of left ankle and foot - NON-BILLABLE CODE

  • Use T25.492A for initial encounter - BILLABLE CODE

  • Use T25.492D for subsequent encounter - BILLABLE CODE

  • Use T25.492S for sequela - BILLABLE CODE

  • T25.499 for Corrosion of unspecified degree of multiple sites of unspecified ankle and foot - NON-BILLABLE CODE

  • Use T25.499A for initial encounter - BILLABLE CODE

  • Use T25.499D for subsequent encounter - BILLABLE CODE

  • Use T25.499S for sequela - BILLABLE CODE

Coding Guidelines

The ICD-10-CM makes a distinction between burns and corrosions. The burn codes are for thermal burns, except sunburns, that come from a heat source, such as a fire or hot appliance. The burn codes are also for burns resulting from electricity and radiation. Corrosions are burns due to chemicals. The guidelines are the same for burns and corrosions.

Sequence first the code that reflects the highest degree of burn when more than one burn is present.

  • When the reason for the admission or encounter is for treatment of external multiple burns, sequence first the code that reflects the burn of the highest degree.
  • When a patient has both internal and external burns, the circumstances of admission govern the selection of the principal diagnosis or first-listed diagnosis.
  • When a patient is admitted for burn injuries and other related conditions such as smoke inhalation and/or respiratory failure, the circumstances of admission govern the selection of the principal or first-listed diagnosis.

Current burns (T20-T25) are classified by depth, extent and by agent (X code). Burns are classified by depth as first degree (erythema), second degree (blistering), and third degree (full-thickness involvement).

Classify burns of the same local site (three-character category level, T20-T28) but of different degrees to the subcategory identifying the highest degree recorded in the diagnosis.

The appropriate 7th character is to be added to each code from block Burn and corrosion of ankle and foot (T25). Use the following options for the aplicable episode of care:

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

Patient Education


Burns

A burn is damage to your body's tissues caused by heat, chemicals, electricity, sunlight, or radiation. Scalds from hot liquids and steam, building fires and flammable liquids and gases are the most common causes of burns. Another kind is an inhalation injury, caused by breathing smoke.

There are three types of burns:

  • First-degree burns damage only the outer layer of skin
  • Second-degree burns damage the outer layer and the layer underneath
  • Third-degree burns damage or destroy the deepest layer of skin and tissues underneath

Burns can cause swelling, blistering, scarring and, in serious cases, shock, and even death. They also can lead to infections because they damage your skin's protective barrier. Treatment for burns depends on the cause of the burn, how deep it is, and how much of the body it covers. Antibiotic creams can prevent or treat infections. For more serious burns, treatment may be needed to clean the wound, replace the skin, and make sure the patient has enough fluids and nutrition.

NIH: National Institute of General Medical Sciences


[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.