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K12 ICD-10-CA category: Stomatitis and related lesions

K12 isn’t a code on its own. Choose one of the 4 codes beneath it, the one the documentation supports.

Official description

K12

Stomatitis and related lesions

ICD-10-CA · Canada

Codes in K12

K12 isn’t a code on its own. Open the code that matches what the note documents.

K12.0Recurrent oral aphthaeK12.1Other forms of stomatitisK12.2Cellulitis and abscess of mouthK12.3Oral mucositis (ulcerative)

Notes for K12

As CIHI prints them, with any note K12 takes from the headings above it.

Excludes

Conditions classified elsewhere.

  • Cancrum oris (A69.0)cheilitis (K13.0)gangrenous stomatitis (A69.0)herpesviral [herpes simplex] gingivostomatitis (B00.2)noma (A69.0)
  • Certain:• conditions originating in the perinatal period (P00-P96)• infectious and parasitic diseases (A00-B99)complications of pregnancy, childbirth and the puerperium (O00-O99)congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)endocrine, nutritional and metabolic diseases (E00-E90)injury, poisoning and certain other consequences of external causes (S00-T98)neoplasms (C00-D48)symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99)From Chapter 11: Diseases of the digestive system (K00-K93)

Where K12 sits

  1. 1ChapterChapter 11: Diseases of the digestive system (K00-K93)
  2. 2Block K00-K14Diseases of oral cavity, salivary glands and jaws
  3. 3Category K12Stomatitis and related lesions

Source and release

Data release
ICD-10-CA · FY 2026–2027
Effective date
Apr 1, 2026
Publisher
CIHI

This page is built from the ICD-10-CA catalog that Vero Codes reads when it suggests codes: Canadian Institute for Health Information’s FY 2026–2027 release, imported from the publisher’s file and checked against it. The description, notes and structured data come from the same record.

See K12 in the CIHI source

Frequently asked questions

Is K12 a valid ICD-10-CA code?

No. K12 (Stomatitis and related lesions) is a category heading in CIHI’s ICD-10-CA FY 2026–2027 release. It holds 4 codes; record the one the documentation supports.

Where is K12 in ICD-10-CA?

K12 sits under K00-K14 Diseases of oral cavity, salivary glands and jaws, within Chapter 11: Diseases of the digestive system (K00-K93).

What coding notes apply to K12?

ICD-10-CA lists Excludes notes for K12, including those from the headings it sits under. They are listed on this page with where each one comes from.

Which ICD-10-CA release does this page use?

It uses CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026 to Mar 31, 2027. It is a reference: confirm the code against the current list and the payer’s rules before you submit it.

Codes beside K12

K00Disorders of tooth development and eruptionK01Embedded and impacted teethK02Dental cariesK03Other diseases of hard tissues of teethK04Diseases of pulp and periapical tissuesK05Gingivitis and periodontal diseasesK06Other disorders of gingiva and edentulous alveolar ridgeK07Dentofacial anomalies [including malocclusion]K08Other disorders of teeth and supporting structuresK09Cysts of oral region, not elsewhere classifiedK10Other diseases of jawsK11Diseases of salivary glandsK13Other diseases of lip and oral mucosaK14Diseases of tongue