Loading...

    Explore
    • Policy Monitoring
    • Live Policy Feed
    • Billing Codes
    • NPI Medicare & Medicaid
    • Healthcare Providers
    • Health Insurance Payers
    • States
    • Service Lines
    • Taxonomy Codes
    Lookup tools
    • Billing Code Lookup
    • CPT Modifier Lookup
    • Provider Taxonomy Code Lookup
    • Healthcare Provider & Facility Lookup
    • Health Insurance Payer Lookup
    • Payer Contact Directory

    Policy & Benchmark Tools

    • Prior Authorization Lookup
    • Coverage Criteria Lookup
    • Timely Filing Lookup
    • Billing Code Reimbursement Rates
    • Payer Comparison Dashboard
    • Facility Comparison Dashboard
    • All tools

    Company

    • About OpenPayer
    • Data Sources
    • Trek Health
    OpenPayerby Trek Health
    LinkedInYouTube

    © 2026 Trek Health. All rights reserved.

    OpenPayer is built and maintained by Trek Health.

    v1.0.28
    OpenPayerBilling CodesDiseases of oral cavity and salivary glandsICD-10-CM k09-cysts-of-oral-region
    Ask Trek AI about this page

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

    The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group K09 includes benign cystic lesions of the oral cavity and adjacent structures not classified in other specific codes, such as mucous retention cysts, epidermoid cysts of the tongue, and other unspecified oral cysts. These ICD-10-CM diagnosis codes are used to document clinical encounters for evaluation, monitoring, and treatment of oral cysts, capturing lesion site, laterality when specified, and clinical complexity. Accurate coding within the ICD-10-CM K09 group supports proper claim adjudication, complete clinical documentation, and appropriate reimbursement.

    Customize your policy alerts

    Sign up for ICD-10-CM Code For Cysts Of Oral Region Not Elsewhere Classified: Group Overview policy alerts

    Get alerted when relevant policies change without checking for updates manually.

    Monitor payer policy activity

    Receive email alerts as soon as relevant payer policies are published or updated.

    ICD-10-CM K09: Cysts Of Oral Region, Not Elsewhere Classified Overview

    The ICD-10-CM K09 group represents cystic lesions affecting the oral cavity and related structures that are not classified elsewhere. These diagnoses target benign cysts of salivary glands, gingiva, tongue, and other oral soft tissues within the head and neck region. Accurate coding is important to reflect the site and nature of the lesion, support appropriate clinical documentation, and ensure proper reimbursement for services related to diagnosis and treatment.

    Table of contents

    Progress1 / 6

    Explore openpayer tools

    • Billing CodesCPT, HCPCS, DRG & more
    • Reimbursement RatesCommercial vs. Medicare rate reports
    • ProvidersHospitals & facilities
    • PayersPlans & market footprint
    • Taxonomy CodesNUCC specialty codes
    • ModifiersCPT modifiers & usage
    • Prior AuthorizationPA policies by payer & drug
    • Timely FilingFiling deadlines by payer
    • Coverage CriteriaMedical necessity by payer
    • Payer ContactsClaims, PA & appeals contacts
    View all tools

    When to Use

    Use a code from this group when a clinician documents a cystic lesion of the oral cavity or adjacent oral structures that does not fit more specific codes elsewhere in the classification. Select the most specific code available for site, laterality if provided, and documented lesion type to accurately reflect the clinical encounter.

    ICD-10-CM Codes

    4 rows

    ICD-10-CM CodeDescription
    K09.0Developmental odontogenic cysts
    K09.1Developmental (nonodontogenic) cysts of oral region
    K09.8Other cysts of oral region, not elsewhere classified
    K09.9Cyst of oral region, unspecified

    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

    • A 28-year-old woman presents to an outpatient oral surgery clinic with a slowly enlarging, painless swelling on the floor of her mouth that has gradually displaced her tongue and caused mild difficulty with speech and eating. Examination and imaging suggest a well-circumscribed mucous-filled lesion consistent with a ranula (a mucous retention pseudocyst arising from the sublingual gland), and the patient is referred for surgical excision. A diagnosis from this group is assigned to classify the cystic lesion of the oral cavity. Typical codes: K09.0
    • A 45-year-old man with a long history of recurrent small painless lumps along the lateral border of his tongue presents for evaluation after noticing persistent enlargement and occasional irritation while chewing. Clinical assessment and biopsy confirm an epithelial-lined cyst of the oral mucosa (epidermoid/dermoid type or other developmental cyst), representing a chronic, noninfectious cystic condition requiring excision. A code from this group is used to document the chronic cystic lesion of the oral region. Typical codes: K09.1, K09.8
    • A 60-year-old patient on anticoagulation presents to the emergency department with acute swelling and severe pain of the lower lip after minor trauma; examination reveals a tense, fluctuant cystic lesion with signs of superimposed infection and rapidly expanding hemorrhage into the cyst. The clinician documents an infected or complicated cyst of the oral soft tissues that requires urgent incision/drainage and possible reversal of anticoagulation; a code from this group is assigned to capture the cystic oral lesion as a comorbidity contributing to the acute presentation. Typical codes: K09.8, K09.9

    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

    K11-DISEASES-OF-SALIVARY-GLANDS

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

    K12-STOMATITIS-AND-RELATED-LESIONS

    ICD-10-CM Code For Stomatitis And Related Lesions: 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.
    Published by

    Trek Health powers OpenPayer with a leading commercial payer intelligence platform, seamlessly converting fragmented payer data into actionable insights for provider organizations.

    Trek Health ingests and normalizes Transparency in Coverage data and payer policy updates to give provider organizations a clear view of how commercial reimbursement behaves across markets, payers, and services. Our platform transforms raw payer disclosures into structured intelligence that supports contract evaluation, payer negotiations, and service line strategy. By combining market benchmarks with ongoing policy visibility, Trek helps teams identify variability, risk, and opportunity in commercial reimbursement. The result is faster insight, stronger negotiating positions, and more informed financial decisions.