2024 ICD-10-CM Diagnosis Code T23.4

Corrosion of unspecified degree of wrist and hand

ICD-10-CM Code:
T23.4
ICD-10 Code for:
Corrosion of unspecified degree of wrist and hand
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 wrist and hand
        (T23)

T23.4 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 wrist and hand. 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 T23.4 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 wrist and hand

Non-specific codes like T23.4 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 wrist and hand:

  • T23.40 for Corrosion of unspecified degree of hand, unspecified site - NON-BILLABLE CODE

  • T23.401 for Corrosion of unspecified degree of right hand, unspecified site - NON-BILLABLE CODE

  • Use T23.401A for initial encounter - BILLABLE CODE

  • Use T23.401D for subsequent encounter - BILLABLE CODE

  • Use T23.401S for sequela - BILLABLE CODE

  • T23.402 for Corrosion of unspecified degree of left hand, unspecified site - NON-BILLABLE CODE

  • Use T23.402A for initial encounter - BILLABLE CODE

  • Use T23.402D for subsequent encounter - BILLABLE CODE

  • Use T23.402S for sequela - BILLABLE CODE

  • T23.409 for Corrosion of unspecified degree of unspecified hand, unspecified site - NON-BILLABLE CODE

  • Use T23.409A for initial encounter - BILLABLE CODE

  • Use T23.409D for subsequent encounter - BILLABLE CODE

  • Use T23.409S for sequela - BILLABLE CODE

  • T23.41 for Corrosion of unspecified degree of thumb (nail) - NON-BILLABLE CODE

  • T23.411 for Corrosion of unspecified degree of right thumb (nail) - NON-BILLABLE CODE

  • Use T23.411A for initial encounter - BILLABLE CODE

  • Use T23.411D for subsequent encounter - BILLABLE CODE

  • Use T23.411S for sequela - BILLABLE CODE

  • T23.412 for Corrosion of unspecified degree of left thumb (nail) - NON-BILLABLE CODE

  • Use T23.412A for initial encounter - BILLABLE CODE

  • Use T23.412D for subsequent encounter - BILLABLE CODE

  • Use T23.412S for sequela - BILLABLE CODE

  • T23.419 for Corrosion of unspecified degree of unspecified thumb (nail) - NON-BILLABLE CODE

  • Use T23.419A for initial encounter - BILLABLE CODE

  • Use T23.419D for subsequent encounter - BILLABLE CODE

  • Use T23.419S for sequela - BILLABLE CODE

  • T23.42 for Corrosion of unspecified degree of single finger (nail) except thumb - NON-BILLABLE CODE

  • T23.421 for Corrosion of unspecified degree of single right finger (nail) except thumb - NON-BILLABLE CODE

  • Use T23.421A for initial encounter - BILLABLE CODE

  • Use T23.421D for subsequent encounter - BILLABLE CODE

  • Use T23.421S for sequela - BILLABLE CODE

  • T23.422 for Corrosion of unspecified degree of single left finger (nail) except thumb - NON-BILLABLE CODE

  • Use T23.422A for initial encounter - BILLABLE CODE

  • Use T23.422D for subsequent encounter - BILLABLE CODE

  • Use T23.422S for sequela - BILLABLE CODE

  • T23.429 for Corrosion of unspecified degree of unspecified single finger (nail) except thumb - NON-BILLABLE CODE

  • Use T23.429A for initial encounter - BILLABLE CODE

  • Use T23.429D for subsequent encounter - BILLABLE CODE

  • Use T23.429S for sequela - BILLABLE CODE

  • T23.43 for Corrosion of unspecified degree of multiple fingers (nail), not including thumb - NON-BILLABLE CODE

  • T23.431 for Corrosion of unspecified degree of multiple right fingers (nail), not including thumb - NON-BILLABLE CODE

  • Use T23.431A for initial encounter - BILLABLE CODE

  • Use T23.431D for subsequent encounter - BILLABLE CODE

  • Use T23.431S for sequela - BILLABLE CODE

  • T23.432 for Corrosion of unspecified degree of multiple left fingers (nail), not including thumb - NON-BILLABLE CODE

  • Use T23.432A for initial encounter - BILLABLE CODE

  • Use T23.432D for subsequent encounter - BILLABLE CODE

  • Use T23.432S for sequela - BILLABLE CODE

  • T23.439 for Corrosion of unspecified degree of unspecified multiple fingers (nail), not including thumb - NON-BILLABLE CODE

  • Use T23.439A for initial encounter - BILLABLE CODE

  • Use T23.439D for subsequent encounter - BILLABLE CODE

  • Use T23.439S for sequela - BILLABLE CODE

  • T23.44 for Corrosion of unspecified degree of multiple fingers (nail), including thumb - NON-BILLABLE CODE

  • T23.441 for Corrosion of unspecified degree of multiple right fingers (nail), including thumb - NON-BILLABLE CODE

  • Use T23.441A for initial encounter - BILLABLE CODE

  • Use T23.441D for subsequent encounter - BILLABLE CODE

  • Use T23.441S for sequela - BILLABLE CODE

  • T23.442 for Corrosion of unspecified degree of multiple left fingers (nail), including thumb - NON-BILLABLE CODE

  • Use T23.442A for initial encounter - BILLABLE CODE

  • Use T23.442D for subsequent encounter - BILLABLE CODE

  • Use T23.442S for sequela - BILLABLE CODE

  • T23.449 for Corrosion of unspecified degree of unspecified multiple fingers (nail), including thumb - NON-BILLABLE CODE

  • Use T23.449A for initial encounter - BILLABLE CODE

  • Use T23.449D for subsequent encounter - BILLABLE CODE

  • Use T23.449S for sequela - BILLABLE CODE

  • T23.45 for Corrosion of unspecified degree of palm - NON-BILLABLE CODE

  • T23.451 for Corrosion of unspecified degree of right palm - NON-BILLABLE CODE

  • Use T23.451A for initial encounter - BILLABLE CODE

  • Use T23.451D for subsequent encounter - BILLABLE CODE

  • Use T23.451S for sequela - BILLABLE CODE

  • T23.452 for Corrosion of unspecified degree of left palm - NON-BILLABLE CODE

  • Use T23.452A for initial encounter - BILLABLE CODE

  • Use T23.452D for subsequent encounter - BILLABLE CODE

  • Use T23.452S for sequela - BILLABLE CODE

  • T23.459 for Corrosion of unspecified degree of unspecified palm - NON-BILLABLE CODE

  • Use T23.459A for initial encounter - BILLABLE CODE

  • Use T23.459D for subsequent encounter - BILLABLE CODE

  • Use T23.459S for sequela - BILLABLE CODE

  • T23.46 for Corrosion of unspecified degree of back of hand - NON-BILLABLE CODE

  • T23.461 for Corrosion of unspecified degree of back of right hand - NON-BILLABLE CODE

  • Use T23.461A for initial encounter - BILLABLE CODE

  • Use T23.461D for subsequent encounter - BILLABLE CODE

  • Use T23.461S for sequela - BILLABLE CODE

  • T23.462 for Corrosion of unspecified degree of back of left hand - NON-BILLABLE CODE

  • Use T23.462A for initial encounter - BILLABLE CODE

  • Use T23.462D for subsequent encounter - BILLABLE CODE

  • Use T23.462S for sequela - BILLABLE CODE

  • T23.469 for Corrosion of unspecified degree of back of unspecified hand - NON-BILLABLE CODE

  • Use T23.469A for initial encounter - BILLABLE CODE

  • Use T23.469D for subsequent encounter - BILLABLE CODE

  • Use T23.469S for sequela - BILLABLE CODE

  • T23.47 for Corrosion of unspecified degree of wrist - NON-BILLABLE CODE

  • T23.471 for Corrosion of unspecified degree of right wrist - NON-BILLABLE CODE

  • Use T23.471A for initial encounter - BILLABLE CODE

  • Use T23.471D for subsequent encounter - BILLABLE CODE

  • Use T23.471S for sequela - BILLABLE CODE

  • T23.472 for Corrosion of unspecified degree of left wrist - NON-BILLABLE CODE

  • Use T23.472A for initial encounter - BILLABLE CODE

  • Use T23.472D for subsequent encounter - BILLABLE CODE

  • Use T23.472S for sequela - BILLABLE CODE

  • T23.479 for Corrosion of unspecified degree of unspecified wrist - NON-BILLABLE CODE

  • Use T23.479A for initial encounter - BILLABLE CODE

  • Use T23.479D for subsequent encounter - BILLABLE CODE

  • Use T23.479S for sequela - BILLABLE CODE

  • T23.49 for Corrosion of unspecified degree of multiple sites of wrist and hand - NON-BILLABLE CODE

  • T23.491 for Corrosion of unspecified degree of multiple sites of right wrist and hand - NON-BILLABLE CODE

  • Use T23.491A for initial encounter - BILLABLE CODE

  • Use T23.491D for subsequent encounter - BILLABLE CODE

  • Use T23.491S for sequela - BILLABLE CODE

  • T23.492 for Corrosion of unspecified degree of multiple sites of left wrist and hand - NON-BILLABLE CODE

  • Use T23.492A for initial encounter - BILLABLE CODE

  • Use T23.492D for subsequent encounter - BILLABLE CODE

  • Use T23.492S for sequela - BILLABLE CODE

  • T23.499 for Corrosion of unspecified degree of multiple sites of unspecified wrist and hand - NON-BILLABLE CODE

  • Use T23.499A for initial encounter - BILLABLE CODE

  • Use T23.499D for subsequent encounter - BILLABLE CODE

  • Use T23.499S 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 wrist and hand (T23). 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.