2026 ICD-10-CM Diagnosis Code K13.79Other lesions of oral mucosa

ICD-10-CM Codes›K00–K95›K00-K14›K13

ICD-10-CM K13.79
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

K13.79 is a billable ICD-10-CM diagnosis code for other lesions of oral mucosa. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 157 through 159. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Any dental condition including traumatic injury, Diseases of mouth; excluding dental, and Nontraumatic dental conditions.

Code Identity

ICD-10-CM Code
K13.79
Billable Status
Yes — Valid for Submission
Code Describes
Other lesions of oral mucosa
Short Description
Other lesions of oral mucosa
Same as the full description in the CMS dataset.
Parent Code
K13.7
Other and unspecified lesions of oral mucosa

Code Classification

ChapterK00–K95Diseases of the digestive system
SectionK00-K14Diseases of oral cavity and salivary glands
CategoryK13Other diseases of lip and oral mucosa
This CodeK13.79Other lesions of oral mucosa

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acquired anomaly of oral mucosa
  • Acquired anomaly of uvula
  • Acquired velopharyngeal dysfunction
  • Acquired velopharyngeal incompetence
  • Anterior crossbite
  • Anterior crossbite with destruction of oral mucosa
  • Betel chewer's mucosa
  • Bilirubin pigmentation of oral mucosa
  • Bleeding gums
  • Bleeding of mouth
  • Bleeding of oral mucosa
  • Bleeding tooth socket
  • Bulls-eye lesion of oral mucous membrane
  • Chronic orofacial pain
  • Chronic orofacial pain due to disorder
  • Chronic orofacial pain due to infectious disease
  • Chronic orofacial pain due to nonvascular intracranial disorder
  • Chronic orofacial pain due to temporomandibular joint disorder
  • Chronic pain in face
  • Chronic primary orofacial pain
  • Chronic secondary oral pain
  • Coating of oral mucosa
  • Cyst of oral soft tissue
  • Deep impinging overbite with soft tissue destruction
  • Deep overbite
  • Dentifrice associated slough
  • Deposit on gingivae
  • Deposits on oral mucosa
  • Deviation of uvula
  • Discomfort in mouth
  • Edema of oral vestibule
  • Erythema of mucous membrane of mouth
  • Erythema of mucous membrane of mouth due to and following traumatic injury
  • Erythema of mucous membrane of oral vestibule
  • Exogenous pigmentation of oral mucosa
  • Focal oral mucinosis
  • Food deposits on oral mucosa
  • Formation of granulation tissue at site of fracture of root of tooth
  • Galvanic lesion of oral cavity
  • Gingival edema
  • Gingival pigmentation
  • Hematoma of buccal mucosa
  • Hematoma of floor of mouth
  • Hematoma of gingivae
  • Hematoma of intraoral surface of lip
  • Hematoma of oral alveolar mucosa
  • Hematoma of oral cavity
  • Hematoma of palate
  • High attachment of labial frenum
  • Hyperkeratosis of mucous membrane of mouth due to and following traumatic injury
  • Hyperkeratosis of oral mucosa
  • Impinging overbite
  • Incomplete closure of velopharyngeal apparatus due to anatomical abnormality
  • Incomplete closure of velopharyngeal apparatus due to cleft palate
  • Inflammatory red colored lesion of internal part of mouth caused by drug
  • Left deviation of uvula
  • Lichenoid allergic contact reaction
  • Lichenoid allergic contact reaction affecting oral mucosa
  • Linea alba of oral mucosa
  • Local black exogenous pigmentation of oral soft tissue
  • Local blue exogenous pigmentation of oral soft tissue
  • Local exogenous pigmentation of floor of mouth
  • Local exogenous pigmentation of left buccal mucosa
  • Local exogenous pigmentation of lower region of left buccal mucosa
  • Local exogenous pigmentation of lower region of right buccal mucosa
  • Local exogenous pigmentation of mucosa of hard palate
  • Local exogenous pigmentation of mucosa of soft palate
  • Local exogenous pigmentation of oral mucosa
  • Local exogenous pigmentation of right buccal mucosa
  • Local exogenous pigmentation of upper region of left buccal mucosa
  • Local exogenous pigmentation of upper region of right buccal mucosa
  • Local green exogenous pigmentation of oral soft tissue
  • Local red exogenous pigmentation of oral soft tissue
  • Local yellow exogenous pigmentation of oral soft tissue
  • Mass of buccal mucosa
  • Melanin pigmentation of oral mucosa
  • Melanoplakia
  • Melanosis of mucosa of body orifice
  • Melanotic macule of gingival mucosa
  • Melanotic macule of oral mucosa
  • Mouth polyp
  • Mucocele of mouth
  • Mucosal plaque
  • Mucous membrane eruption of oral mucous membrane
  • Mucous membrane erythema
  • Mucous patch of oral mucosa
  • Oral cavity opening not assessable
  • Oral hair
  • Oral infection
  • Oral lichenoid mucositis
  • Oral lichenoid reaction
  • Oral melanocytic macule
  • Oral melanoplakia
  • Oral mucosal bacterial disease
  • Pain in palate
  • Pain of inferior aspect of palate
  • Pain of region of internal part of mouth
  • Painful mouth
  • Palatal paresis
  • Paralysis of palate
  • Paralysis of uvula
  • Peri-implant oral soft tissue deficiency
  • Pigmentary disturbance of oral mucosa
  • Pigmentation of oral mucosa
  • Pigmented oral mucosal lesion
  • Pruritus of oral soft tissues
  • Purpura of mouth region
  • Racial pigmentation of oral mucosa
  • Rash of mouth
  • Right deviation of uvula
  • Salivary gland hematoma
  • Scar of floor of mouth
  • Scar of left buccal mucosa
  • Scar of lower left buccal mucosa
  • Scar of lower right buccal mucosa
  • Scar of mucosa of hard palate
  • Scar of mucosa of soft palate
  • Scar of right buccal mucosa
  • Scar of upper left buccal mucosa
  • Scar of upper right buccal mucosa
  • Smokeless tobacco keratosis
  • Sucking calluses on mouth
  • Systemic exogenous pigmentation of oral mucosa
  • Tenderness of digestive structure
  • Tenderness of oral cavity structure
  • Traumatic oral ulceration
  • Traumatic ulcer of oral mucosa
  • Uvula tag
  • Uvular hypertrophy
  • Velopharyngeal incompetence
  • White patches on oral mucosa
  • White traceries on oral mucosa

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Inclusion Terms

  • Focal oral mucinosis

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Atrophy, atrophic(of)
      • buccal cavity
    • Cicatrix(adherent) (contracted) (painful) (vicious)
      • mouth
    • Cicatrix(adherent) (contracted) (painful) (vicious)
      • palate (soft)
    • Deformity
      • mouth (acquired)
    • Hemorrhage, hemorrhagic(concealed)
      • mouth
    • Hypertrophy, hypertrophic
      • palate (hard)
        • soft
    • Hypertrophy, hypertrophic
      • uvula
    • Insufficiency, insufficient
      • velopharyngeal
        • acquired
    • Lesion(s) (nontraumatic)
      • buccal cavity
    • Lesion(s) (nontraumatic)
      • mouth
    • Mucinosis(cutaneous) (focal) (papular) (reticular erythematous) (skin)
      • oral
    • Mucocele
      • buccal cavity
    • Pain(s)
      • mouth
    • Palatoplegia
    • Paralysis, paralytic(complete) (incomplete)
      • palate (soft)
    • Paralysis, paralytic(complete) (incomplete)
      • uvula
    • Paralysis, paralytic(complete) (incomplete)
      • velum palati
    • Perforation, perforated(nontraumatic) (of)
      • uvula
    • Sore
      • mouth
    • Stomatorrhagia

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR DEN001
Any dental condition including traumatic injury
Default principal diagnosis: inpatient No · outpatient No
CCSR DIG003
Diseases of mouth; excluding dental
Default principal diagnosis: inpatient Yes · outpatient Yes
CCSR DEN002
Nontraumatic dental conditions
Default principal diagnosis: inpatient No · outpatient No

Patient EducationClinical

Mouth Disorders

Your mouth is one of the most important parts of your body. It has many different functions. It allows you to:

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert K13.79 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
528.9 Oral soft tissue dis NEC
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About K13.79Overview

Is K13.79 (Other and unspecified lesions of oral mucosa) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report other lesions of oral mucosa on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does K13.79 group to?

When other lesions of oral mucosa is the principal diagnosis on an inpatient stay, it groups to MS-DRG 157, 158, 159, with relative weights from 0.7085 to 1.7168 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of K13.79?

Under the General Equivalence Mappings, other lesions of oral mucosa converts to ICD-9-CM 528.9 (oral soft tissue dis NEC). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.