2021 ICD-10-CM Code K12.0

Recurrent oral aphthae

Version 2021
Billable Code

Valid for Submission

K12.0 is a billable diagnosis code used to specify a medical diagnosis of recurrent oral aphthae. The code K12.0 is valid during the fiscal year 2021 from October 01, 2020 through September 30, 2021 for the submission of HIPAA-covered transactions.

The ICD-10-CM code K12.0 might also be used to specify conditions or terms like abrasion of hard palate, abrasion of palate, aphthae major, aphthous ulcer of mouth, aphthous ulcer of mouth , aphthous ulceration of skin and/or mucous membrane, etc.

ICD-10:K12.0
Short Description:Recurrent oral aphthae
Long Description:Recurrent oral aphthae

Code Classification

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 K12.0:


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.

Index to Diseases and Injuries

The Index to Diseases and Injuries is an alphabetical listing of medical terms, with each term mapped to one or more ICD-10 code(s). The following references for the code K12.0 are found in the index:

Approximate Synonyms

The following clinical terms are approximate synonyms or lay terms that might be used to identify the correct diagnosis code:

Convert K12.0 to ICD-9 Code

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)