2020 ICD-10-CM Diagnosis Code K12.0

Recurrent oral aphthae

    2016 2017 2018 2019 2020 Billable/Specific Code
  • K12.0 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2020 edition of ICD-10-CM K12.0 became effective on October 1, 2019.
  • This is the American ICD-10-CM version of K12.0 - other international versions of ICD-10 K12.0 may differ.
Applicable To
  • Aphthous stomatitis (major) (minor)
  • Bednar's aphthae
  • Periadenitis mucosa necrotica recurrens
  • Recurrent aphthous ulcer
  • Stomatitis herpetiformis
The following code(s) above K12.0 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
  • Applicable To annotations, or
  • Code Also annotations, or
  • Code First annotations, or
  • Excludes1 annotations, or
  • Excludes2 annotations, or
  • Includes annotations, or
  • Note annotations, or
  • Use Additional annotations
that may be applicable to K12.0:
  • K00-K95
    2020 ICD-10-CM Range K00-K95

    Diseases of the digestive system

    Type 2 Excludes
    • certain conditions originating in the perinatal period (P04-P96)
    • certain infectious and parasitic diseases (A00-B99)
    • complications of pregnancy, childbirth and the puerperium (O00-O9A)
    • congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
    • endocrine, nutritional and metabolic diseases (E00-E88)
    • injury, poisoning and certain other consequences of external causes (S00-T88)
    • neoplasms (C00-D49)
    • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
    Diseases of the digestive system
  • K12
    ICD-10-CM Diagnosis Code K12

    Stomatitis and related lesions

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Type 1 Excludes
    • cancrum oris (A69.0)
    • cheilitis (K13.0)
    • gangrenous stomatitis (A69.0)
    • herpesviral [herpes simplex] gingivostomatitis (B00.2)
    • noma (A69.0)
    Use Additional
    • code to identify:
    • alcohol abuse and dependence (F10.-)
    • exposure to environmental tobacco smoke (Z77.22)
    • exposure to tobacco smoke in the perinatal period (P96.81)
    • history of tobacco dependence (Z87.891)
    • occupational exposure to environmental tobacco smoke (Z57.31)
    • tobacco dependence (F17.-)
    • tobacco use (Z72.0)
    Stomatitis and related lesions
Approximate Synonyms
  • Aphthous stomatitis (canker sore of mouth)
  • Aphthous ulcer of mouth
  • Periodic fever aphthous-stomatitis pharyngitis adenitis syndrome
Clinical Information
  • Symmetric excoriation of the hard palate often due to sucking in infants
ICD-10-CM K12.0 is grouped within Diagnostic Related Group(s) (MS-DRG v37.0):
  • 011 Tracheostomy for face, mouth & neck diagnoses or laryngectomy with mcc
  • 012 Tracheostomy for face, mouth & neck diagnoses or laryngectomy with cc
  • 013 Tracheostomy for face, mouth & neck diagnoses or laryngectomy without cc/mcc
  • 157 Dental and oral diseases with mcc
  • 158 Dental and oral diseases with cc
  • 159 Dental and oral diseases without cc/mcc

Convert K12.0 to ICD-9-CM

Code History
  • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
  • 2017 (effective 10/1/2016): No change
  • 2018 (effective 10/1/2017): No change
  • 2019 (effective 10/1/2018): No change
  • 2020 (effective 10/1/2019): No change

Diagnosis Index entries containing back-references to K12.0:
  • Aphthae, aphthous - see also condition
    • ulcer (oral) (recurrent) K12.0
    • Bednar's K12.0
    • oral K12.0 (recurrent)
    • stomatitis K12.0 (major) (minor)
  • Bednar's
    • aphthae K12.0
  • Canker (mouth) (sore) K12.0
  • Periadenitis mucosa necrotica recurrens K12.0
  • Sore
    • mouth K13.79
      ICD-10-CM Diagnosis Code K13.79

      Other lesions of oral mucosa

        2016 2017 2018 2019 2020 Billable/Specific Code
      Applicable To
      • Focal oral mucinosis
      • canker K12.0
  • Stomatitis (denture) (ulcerative) K12.1
    ICD-10-CM Diagnosis Code K12.1

    Other forms of stomatitis

      2016 2017 2018 2019 2020 Billable/Specific Code
    Applicable To
    • Stomatitis NOS
    • Denture stomatitis
    • Ulcerative stomatitis
    • Vesicular stomatitis
    Type 1 Excludes
    • acute necrotizing ulcerative stomatitis (A69.1)
    • Vincent's stomatitis (A69.1)
    • aphthous K12.0
    • herpetiformis K12.0
  • Ulcer, ulcerated, ulcerating, ulceration, ulcerative

ICD-10-CM Codes Adjacent To K12.0
K11.22 Acute recurrent sialoadenitis
K11.23 Chronic sialoadenitis
K11.3 Abscess of salivary gland
K11.4 Fistula of salivary gland
K11.5 Sialolithiasis
K11.6 Mucocele of salivary gland
K11.7 Disturbances of salivary secretion
K11.8 Other diseases of salivary glands
K11.9 Disease of salivary gland, unspecified
K12 Stomatitis and related lesions
K12.0 Recurrent oral aphthae
K12.1 Other forms of stomatitis
K12.2 Cellulitis and abscess of mouth
K12.3 Oral mucositis (ulcerative)
K12.30 …… unspecified
K12.31 …… due to antineoplastic therapy
K12.32 …… due to other drugs
K12.33 …… due to radiation
K12.39 Other oral mucositis (ulcerative)
K13 Other diseases of lip and oral mucosa
K13.0 Diseases of lips

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.