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    v1.0.28
    OpenPayerBilling CodesDiseases of oral cavity and salivary glandsICD-10-CM k12-stomatitis-and-related-lesions
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    ICD-10-CM Code For Stomatitis And Related Lesions: Group Overview

    The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group K12 includes inflammatory and ulcerative conditions of the oral mucosa such as stomatitis, aphthous ulcers, and related lesions affecting the mouth and tongue. These ICD-10-CM diagnosis codes are used to document clinical scenarios involving oral mucosal inflammation, ulceration, infection, or traumatic injury, capturing disease severity and anatomic involvement. Accurate coding within the ICD-10-CM K12 group supports proper claim adjudication and complete clinical documentation for appropriate reimbursement.

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    ICD-10-CM K12: Stomatitis And Related Lesions Overview

    The ICD-10-CM K12 group comprises inflammatory and ulcerative conditions of the oral mucosa, including stomatitis, aphthous ulcers, and glossitis, which affect the mouth and associated structures. These diagnoses target the oral cavity and salivary gland region and include infectious, traumatic, and idiopathic causes of mucosal lesions. Accurate coding is important to reflect disease severity and extent for clinical records and to support correct reimbursement and claim processing.

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    When to Use

    Use a code from this group when documenting clinical encounters for patients with oral mucosal inflammation, ulcers, or related lesions identified on examination. Select the specific code that reflects the lesion type, anatomical site, severity, and any specified cause when available.

    ICD-10-CM Codes

    8 rows

    ICD-10-CM CodeDescription
    K12.0Recurrent oral aphthae
    K12.1Other forms of stomatitis
    K12.2Cellulitis and abscess of mouth
    K12.30Oral mucositis (ulcerative), unspecified
    K12.31Oral mucositis (ulcerative) due to antineoplastic therapy
    K12.32Oral mucositis (ulcerative) due to other drugs
    K12.33Oral mucositis (ulcerative) due to radiation
    K12.39Other oral mucositis (ulcerative)

    DRG Codes

    6 rows

    DRG CodeDescription
    011Tracheostomy for Face, Mouth and Neck Diagnoses or Laryngectomy with MCC
    012Tracheostomy for Face, Mouth and Neck Diagnoses or Laryngectomy with CC
    013Tracheostomy for Face, Mouth and Neck Diagnoses or Laryngectomy without CC/MCC
    157Dental and Oral Diseases with MCC
    158Dental and Oral Diseases with CC
    159Dental and Oral Diseases without CC/MCC

    Typical Clinical Scenarios

    • An adult patient presents to urgent care with sudden onset of painful, multiple small shallow oral ulcers on the buccal mucosa and tongue following a recent viral upper respiratory infection; the lesions are acute, limiting oral intake for 2–3 days and there is no history of recurrent ulcers. A diagnosis from this group is assigned for acute, non-healing aphthous-type stomatitis likely related to a recent infection causing mucosal inflammation. Typical codes: K12.0, K12.1
    • A middle-aged patient in a primary care clinic reports a year-long history of recurrent, larger, painful oral ulcers with periodic remissions and exacerbations, sometimes associated with systemic symptoms or suspected autoimmune disease; treatment focuses on symptom control and monitoring for complications. A chronic or recurrent stomatitis code from this group is used to document ongoing mucosal ulcerative disease and guide longitudinal care. Typical codes: K12.1, K12.2
    • A hospitalized oncology patient receiving chemotherapy develops severe confluent mucosal ulceration and erythema of the mouth with difficulty swallowing and risk of secondary infection; the acute mucositis is a complication of cytotoxic therapy requiring supportive care and possible infection surveillance. A code from this group is assigned to capture the treatment-related stomatitis as a complication affecting the oral cavity. Typical codes: K12.31, K12.32

    Related Codes

    K00-DISORDERS-OF-TOOTH-DEVELOPMENT-AND-ERUPTION

    ICD-10-CM Code For Disorders Of Tooth Development And Eruption: Group Overview

    K01-EMBEDDED-AND-IMPACTED-TEETH

    ICD-10-CM Code For Embedded And Impacted Teeth: Group Overview

    K02-DENTAL-CARIES

    ICD-10-CM Code For Dental Caries: Group Overview

    K03-OTHER-DISEASES-OF-HARD-TISSUES-OF-TEETH

    ICD-10-CM Code For Other Diseases Of Hard Tissues Of Teeth: Group Overview

    K04-DISEASES-OF-PULP-AND-PERIAPICAL-TISSUES

    ICD-10-CM Code For Diseases Of Pulp And Periapical Tissues: Group Overview

    K05-GINGIVITIS-AND-PERIODONTAL-DISEASES

    ICD-10-CM Code For Gingivitis And Periodontal Diseases: Group Overview

    K06-OTHER-DISORDERS-OF-GINGIVA

    ICD-10-CM Code For Other Disorders Of Gingiva And Edentulous Alveolar Ridge: Group Overview

    K08-OTHER-DISORDERS-OF-TEETH

    ICD-10-CM Code For Other Disorders Of Teeth And Supporting Structures: Group Overview

    K09-CYSTS-OF-ORAL-REGION

    ICD-10-CM Code For Cysts Of Oral Region Not Elsewhere Classified: Group Overview

    K11-DISEASES-OF-SALIVARY-GLANDS

    ICD-10-CM Code For Diseases Of Salivary Glands: Group Overview

    Showing 1–10 of 12

    Frequently Asked Questions

    References

    1. 1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
    2. 2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
    3. 3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.
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