2026 ICD-10-CM Diagnosis Code K09.0Developmental odontogenic cysts

ICD-10-CM Codes›K00–K95›K00-K14›K09

ICD-10-CM K09.0
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

K09.0 is a billable ICD-10-CM diagnosis code for developmental odontogenic cysts. 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, Disorders of teeth and gingiva, and Nontraumatic dental conditions.

Code Identity

ICD-10-CM Code
K09.0
Billable Status
Yes — Valid for Submission
Code Describes
Developmental odontogenic cysts
Short Description
Developmental odontogenic cysts
Same as the full description in the CMS dataset.
Parent Code
K09
Cysts of oral region, not elsewhere classified

Code Classification

ChapterK00–K95Diseases of the digestive system
SectionK00-K14Diseases of oral cavity and salivary glands
CategoryK09Cysts of oral region, not elsewhere classified
This CodeK09.0Developmental odontogenic cysts

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Botryoid odontogenic cyst
  • Cyst of oral soft tissue
  • Dentigerous cyst
  • Eruption cyst of jaw
  • Gingival cyst of newborn
  • Gingival odontogenic cyst
  • Glandular odontogenic cyst
  • Inflammatory odontogenic cyst
  • Lateral developmental cyst of jaw
  • Odontogenic cyst
  • Odontogenic keratocyst
  • Primordial cyst

Tabular List NotesGuidance

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

Inclusion Terms

  • Dentigerous cyst
  • Eruption cyst
  • Follicular cyst
  • Gingival cyst
  • Lateral periodontal cyst
  • Primordial cyst

Type 2 Excludes

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.

    • Cyst(colloid) (mucous) (simple) (retention)
      • bone (local) NEC
        • specified type NEC
          • jaw
            • developmental (nonodontogenic)
              • odontogenic
    • Cyst(colloid) (mucous) (simple) (retention)
      • dental (root)
        • developmental
    • Cyst(colloid) (mucous) (simple) (retention)
      • dental (root)
        • eruption
    • Cyst(colloid) (mucous) (simple) (retention)
      • dental (root)
        • primordial
    • Cyst(colloid) (mucous) (simple) (retention)
      • dentigerous (mandible) (maxilla)
    • Cyst(colloid) (mucous) (simple) (retention)
      • developmental
        • odontogenic
    • Cyst(colloid) (mucous) (simple) (retention)
      • eruption
    • Cyst(colloid) (mucous) (simple) (retention)
      • follicular (atretic) (hemorrhagic) (ovarian)
        • dentigerous
    • Cyst(colloid) (mucous) (simple) (retention)
      • follicular (atretic) (hemorrhagic) (ovarian)
        • odontogenic
    • Cyst(colloid) (mucous) (simple) (retention)
      • gingiva
    • Cyst(colloid) (mucous) (simple) (retention)
      • jaw (bone)
        • developmental (odontogenic)
    • Cyst(colloid) (mucous) (simple) (retention)
      • lateral periodontal
    • Cyst(colloid) (mucous) (simple) (retention)
      • mandible
        • dentigerous
    • Cyst(colloid) (mucous) (simple) (retention)
      • maxilla
        • dentigerous
    • Cyst(colloid) (mucous) (simple) (retention)
      • odontogenic, developmental
    • Cyst(colloid) (mucous) (simple) (retention)
      • pericoronal
    • Cyst(colloid) (mucous) (simple) (retention)
      • periodontal
        • lateral
    • Cyst(colloid) (mucous) (simple) (retention)
      • primordial (jaw)
    • Dentigerous cyst

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 DIG002
Disorders of teeth and gingiva
Default principal diagnosis: inpatient Yes · outpatient Yes
CCSR DEN002
Nontraumatic dental conditions
Default principal diagnosis: inpatient No · outpatient No

Clinical InformationClinical

  • Dentigerous Cyst

    most common follicular odontogenic cyst. occurs in relation to a partially erupted or unerupted tooth with at least the crown of the tooth to which the cyst is attached protruding into the cystic cavity. may give rise to an ameloblastoma and, in rare instances, undergo malignant transformation.

  • Ameloblastic Carcinoma Derived From Odontogenic Cyst|Ameloblastic Carcinoma Ex Odontogenic Cyst

    a rare, aggressive malignant tumor that originates from an odontogenic cyst in the maxillomandibular region. it combines the histologic features of an ameloblastoma and carcinoma.

  • Botryoid Odontogenic Cyst|BOC

    the multicystic variant of lateral periodontal cyst. (who 2017)

  • Calcifying Cystic Odontogenic Tumor|Calcifying Odontogenic Cyst|Calcifying odontogenic cyst|Gorlin Cyst

    a benign, intraosseous or extraosseous cystic neoplasm arising from tooth-forming tissues. it is characterized by the presence of a cyst lined by an ameloblastoma-like epithelium and ghost cells formation. the ghost cells may undergo calcification. it is treated with enucleation. few recurrences have been reported for intraosseous neoplasms whereas no recurrences have been reported for extraosseous neoplasms.

  • Calcifying Odontogenic Cyst|COC

    a simple odontogenic cyst lined by ameloblastoma-like epithelium, which contains focal accumulations of ghost cells. (who 2017)

  • Glandular Odontogenic Cyst|GOC

    a developmental odontogenic cyst with epithelial features that simulate salivary gland or glandular differentiation. (who 2017)

  • Odontogenic Cyst

    a cyst in the jaw that arises from tissues of tooth development.

  • Orthokeratinized Odontogenic Cyst|OOC

    an odontogenic cyst that is entirely or predominantly lined by orthokeratinized stratified squamous epithelium. (who 2017)

  • Primary Intraosseous Squamous Cell Carcinoma Derived From Odontogenic Cyst|Primary Intraosseous Carcinoma Ex Odontogenic Cyst

    a rare squamous cell carcinoma that arises centrally from the jaw from the lining of an odontogenic cyst.

  • Dentigerous Cyst

    an odontogenic cyst that is attached to the cervical region of an unerupted tooth and envelops the crown. (who 2017)

  • Primary Intraosseous Carcinoma, Not Otherwise Specified, Derived from Odontogenic Cyst|Primary Intraosseous Carcinoma Ex Odontogenic Cyst|Primary Intraosseous Squamous Cell Carcinoma Derived From Odontogenic Cyst

    a rare primary intraosseous carcinoma, not otherwise specified, that arises from the lining of an odontogenic cyst.

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 K09.0 to ICD-9-CMHistory

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

ICD-9-CM
526.0 Devel odontogenic cysts
Exact Match The mapping is direct, with no qualifiers.

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 K09.0Overview

Is K09.0 (Cysts of oral region, not elsewhere classified) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report developmental odontogenic cysts on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does K09.0 group to?

When developmental odontogenic cysts 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 K09.0?

Under the General Equivalence Mappings, developmental odontogenic cysts converts to ICD-9-CM 526.0 (devel odontogenic cysts). The mapping is a direct match.

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.