2022 ICD-10-CM Code K12

Stomatitis and related lesions

Version 2021

Not Valid for Submission

ICD-10:K12
Short Description:Stomatitis and related lesions
Long Description:Stomatitis and related lesions

Code Classification

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

K12 is a non-specific and non-billable diagnosis code code, consider using a code with a higher level of specificity for a diagnosis of stomatitis and related lesions. 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 Stomatitis and related lesions

Non-specific codes like K12 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 stomatitis and related lesions:

  • BILLABLE CODE - Use K12.0 for Recurrent oral aphthae
  • BILLABLE CODE - Use K12.1 for Other forms of stomatitis
  • BILLABLE CODE - Use K12.2 for Cellulitis and abscess of mouth
  • NON-BILLABLE CODE - K12.3 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:


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.

Type 1 Excludes

Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.

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.


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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)