ICD-10 Code K09.0 – Developmental odontogenic cysts (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K09.0 – Developmental odontogenic cysts
What it is
K09.0 identifies developmental odontogenic cysts, which are cysts arising from tooth-forming tissues. Use it when the record documents a developmental cyst of odontogenic origin rather than an inflammatory jaw lesion.
Clinical signs
Clinical features vary; refer to documentation. These cysts are often found on dental exam or imaging as a well-defined jaw lesion, sometimes with swelling, tooth displacement, or delayed eruption.
When to use this code
Use K09.0 when the clinician documents a developmental odontogenic cyst, such as a dentigerous or other developmental odontogenic cyst, and the diagnosis is confirmed or clearly stated. Code it from imaging, pathology, or operative notes when the lesion is identified as developmental and odontogenic. If the note only says “jaw cyst,” check documentation.
Do not use for
Do not use K09.0 for inflammatory odontogenic cysts, abscesses, or nonspecific jaw masses. If the record does not specify a developmental odontogenic cyst, do not assume this code.
Coding tip
Look for the exact cyst type in pathology or oral surgery documentation before assigning K09.0.