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    v1.0.28
    OpenPayerBilling CodesDiseases of oral cavity and salivary glandsICD-10-CM k13-other-diseases-of-lip-and-oral-mucosa
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    ICD-10-CM Code For Other Diseases Of Lip And Oral Mucosa: Group Overview

    The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group K13 includes a range of disorders affecting the lips and oral mucosa such as aphthous ulcers, hyperkeratosis, leukoplakia, and other localized mucosal lesions that are not categorized elsewhere. These ICD-10-CM diagnosis codes are used to document clinical encounters for mucosal lesions, ulcers, and other oral surface conditions, capturing severity, anatomic site, and any complications. Accurate coding within the ICD-10-CM K13 group supports proper claim adjudication, complete clinical documentation, and appropriate reimbursement.

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    ICD-10-CM K13: Other Diseases Of Lip And Oral Mucosa Overview

    The ICD-10-CM K13 code group captures a range of noninfectious and nonspecific disorders affecting the lips and oral mucosa, including ulcerations, hyperkeratosis, and other localized lesions. These diagnoses target the oral cavity and associated mucosal tissues and often reflect symptoms such as pain, bleeding, or impaired oral function. Accurate coding matters for proper clinical documentation and supports appropriate claim adjudication and reimbursement.

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    When to Use

    Use a code from this group when a patient presents with a documented disorder of the lip or oral mucosa such as an aphthous ulcer, leukoplakic change, or other localized lesion that is not better classified elsewhere. Select the most specific code reflecting the lesion type, anatomic location, and any documented complications to support clinical documentation and billing.

    ICD-10-CM Codes

    13 rows

    ICD-10-CM CodeDescription
    K13.0Diseases of lips
    K13.1Cheek and lip biting
    K13.21Leukoplakia of oral mucosa, including tongue
    K13.22Minimal keratinized residual ridge mucosa
    K13.23Excessive keratinized residual ridge mucosa
    K13.24Leukokeratosis nicotina palati
    K13.29Other disturbances of oral epithelium, including tongue
    K13.3Hairy leukoplakia
    K13.4Granuloma and granuloma-like lesions of oral mucosa
    K13.5Oral submucous fibrosis
    K13.6Irritative hyperplasia of oral mucosa
    K13.70Unspecified lesions of oral mucosa
    K13.79Other lesions of oral mucosa

    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 presents to urgent care with sudden onset of painful, shallow ulcers on the buccal mucosa and inner lips after a recent febrile viral illness. Examination shows multiple aphthous-like lesions without systemic mucocutaneous involvement; symptomatic management is provided and a diagnosis from this group is assigned for the localized oral ulceration. Typical codes: K13.0
    • A middle-aged patient in primary care has a several-month history of a well-demarcated, nonhealing white plaque on the lateral tongue and adjacent oral mucosa; biopsy rules out dysplasia but documents hyperkeratosis and chronic mucosal irritation. The chronic mucosal change related to reactive keratosis or leukoplakia is coded from this group to capture the ongoing oral mucosal disorder and need for surveillance. Typical codes: K13.21, K13.22
    • An elderly nursing home resident with advanced dementia develops severe drooling, thickened oral secretions, and mucosal excoriation around the lips from chronic saliva pooling and poor oral intake; nursing staff request documentation to support treatment and oral hygiene interventions. A code from this group is used to record the resultant inflammatory changes of the lip and oral mucosa as a comorbid condition complicating care. Typical codes: K13.5, K13.6

    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

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    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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