2021 ICD-10-CM Code T20.4

Corrosion of unspecified degree of head, face, and neck

Version 2021
Non-Billable Code
Unspecified Code

Not Valid for Submission

T20.4 is a "header" nonspecific 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 head, face, and neck. The code is NOT valid for the year 2021 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 T20.4 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.

ICD-10:T20.4
Short Description:Corrosion of unspecified degree of head, face, and neck
Long Description:Corrosion of unspecified degree of head, face, and neck

Code Classification

Specific Coding for Corrosion of unspecified degree of head, face, and neck

Header codes like T20.4 require more digits to indicate the appropriate level of specificity. Consider using any of the following ICD-10 codes with a higher level of specificity when coding for corrosion of unspecified degree of head, face, and neck:

  • T20.40 - ... unspecified site
  • T20.40XA - ... unspecified site, initial encounter
  • T20.40XD - ... unspecified site, subsequent encounter
  • T20.40XS - ... unspecified site, sequela
  • T20.41 - Corrosion of unspecified degree of ear [any part, except ear drum]
  • T20.411 - Corrosion of unspecified degree of right ear [any part, except ear drum]
  • T20.411A - Corrosion of unspecified degree of right ear [any part, except ear drum], initial encounter
  • T20.411D - Corrosion of unspecified degree of right ear [any part, except ear drum], subsequent encounter
  • T20.411S - Corrosion of unspecified degree of right ear [any part, except ear drum], sequela
  • T20.412 - Corrosion of unspecified degree of left ear [any part, except ear drum]
  • T20.412A - Corrosion of unspecified degree of left ear [any part, except ear drum], initial encounter
  • T20.412D - Corrosion of unspecified degree of left ear [any part, except ear drum], subsequent encounter
  • T20.412S - Corrosion of unspecified degree of left ear [any part, except ear drum], sequela
  • T20.419 - Corrosion of unspecified degree of unspecified ear [any part, except ear drum]
  • T20.419A - Corrosion of unspecified degree of unspecified ear [any part, except ear drum], initial encounter
  • T20.419D - Corrosion of unspecified degree of unspecified ear [any part, except ear drum], subsequent encounter
  • T20.419S - Corrosion of unspecified degree of unspecified ear [any part, except ear drum], sequela
  • T20.42 - Corrosion of unspecified degree of lip(s)
  • T20.42XA - Corrosion of unspecified degree of lip(s), initial encounter
  • T20.42XD - Corrosion of unspecified degree of lip(s), subsequent encounter
  • T20.42XS - Corrosion of unspecified degree of lip(s), sequela
  • T20.43 - Corrosion of unspecified degree of chin
  • T20.43XA - Corrosion of unspecified degree of chin, initial encounter
  • T20.43XD - Corrosion of unspecified degree of chin, subsequent encounter
  • T20.43XS - Corrosion of unspecified degree of chin, sequela
  • T20.44 - Corrosion of unspecified degree of nose (septum)
  • T20.44XA - Corrosion of unspecified degree of nose (septum), initial encounter
  • T20.44XD - Corrosion of unspecified degree of nose (septum), subsequent encounter
  • T20.44XS - Corrosion of unspecified degree of nose (septum), sequela
  • T20.45 - Corrosion of unspecified degree of scalp [any part]
  • T20.45XA - Corrosion of unspecified degree of scalp [any part], initial encounter
  • T20.45XD - Corrosion of unspecified degree of scalp [any part], subsequent encounter
  • T20.45XS - Corrosion of unspecified degree of scalp [any part], sequela
  • T20.46 - Corrosion of unspecified degree of forehead and cheek
  • T20.46XA - Corrosion of unspecified degree of forehead and cheek, initial encounter
  • T20.46XD - Corrosion of unspecified degree of forehead and cheek, subsequent encounter
  • T20.46XS - Corrosion of unspecified degree of forehead and cheek, sequela
  • T20.47 - Corrosion of unspecified degree of neck
  • T20.47XA - Corrosion of unspecified degree of neck, initial encounter
  • T20.47XD - Corrosion of unspecified degree of neck, subsequent encounter
  • T20.47XS - Corrosion of unspecified degree of neck, sequela
  • T20.49 - Corrosion of unspecified degree of multiple sites of head, face, and neck
  • T20.49XA - Corrosion of unspecified degree of multiple sites of head, face, and neck, initial encounter
  • T20.49XD - Corrosion of unspecified degree of multiple sites of head, face, and neck, subsequent encounter
  • T20.49XS - Corrosion of unspecified degree of multiple sites of head, face, and neck, sequela

Tabular List of Diseases and Injuries

The Tabular List of Diseases and Injuries is a list of ICD-10 codes, organized "head to toe" into chapters and sections with guidance for inclusions, exclusions, descriptions and more. The following references are applicable to the code T20.4:


Code First

Code First
Certain conditions have both an underlying etiology and multiple body system manifestations due to the underlying etiology. For such conditions, the ICD-10-CM has a coding convention that requires the underlying condition be sequenced first followed by the manifestation. Wherever such a combination exists, there is a "use additional code" note at the etiology code, and a "code first" note at the manifestation code. These instructional notes indicate the proper sequencing order of the codes, etiology followed by manifestation.

Use Additional Code

Use Additional Code
The “use additional code” indicates that a secondary code could be used to further specify the patient’s condition. This note is not mandatory and is only used if enough information is available to assign an additional code.

Information for Patients


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:

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


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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)