2022 ICD-10-CM Code K12.3

Oral mucositis (ulcerative)

Version 2021

Not Valid for Submission

ICD-10:K12.3
Short Description:Oral mucositis (ulcerative)
Long Description:Oral mucositis (ulcerative)

Code Classification

  • Diseases of the digestive system (K00–K93)
    • Diseases of oral cavity and salivary glands (K00-K14)
      • Stomatitis and related lesions (K12)

K12.3 is a non-specific and non-billable diagnosis code code, consider using a code with a higher level of specificity for a diagnosis of oral mucositis (ulcerative). The code is not specific and is NOT valid for the year 2022 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.

Specific Coding for Oral mucositis (ulcerative)

Non-specific codes like K12.3 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 oral mucositis (ulcerative):

  • BILLABLE CODE - Use K12.30 for Oral mucositis (ulcerative), unspecified
  • BILLABLE CODE - Use K12.31 for Oral mucositis (ulcerative) due to antineoplastic therapy
  • BILLABLE CODE - Use K12.32 for Oral mucositis (ulcerative) due to other drugs
  • BILLABLE CODE - Use K12.33 for Oral mucositis (ulcerative) due to radiation
  • BILLABLE CODE - Use K12.39 for Other oral mucositis (ulcerative)

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 coding notes and guidance for inclusions, exclusions, descriptions and more. The following references are applicable to the code K12.3:


Inclusion Terms

Inclusion Terms
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.

Type 2 Excludes

Type 2 Excludes
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.

Clinical Information

Information for Patients


Mouth Disorders

Your mouth is one of the most important parts of your body. It has many different functions. It allows you to

Any problem that affects your mouth can make it hard to eat, drink, or even smile. Some common mouth problems include

Treatment for mouth disorders varies, depending on the problem. If a mouth problem is caused by some other disease, treating that disease can help. It is also important to keep your mouth clean and healthy by brushing, flossing, and not using tobacco.


[Learn More in MedlinePlus]

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)