2026 ICD-10-CM Diagnosis Code K09Cysts of oral region, not elsewhere classified
K09 is a non-billable ICD-10-CM category code for cysts of oral region, not elsewhere classified, so it cannot be submitted on claims. Use a more specific code from this category instead, such as K09.0, K09.1, K09.8, and K09.9.
Code Identity
Code Classification
Specific Coding for Cysts of oral region, not elsewhere classifiedOverview
Non-specific codes like K09 require more characters. Use one of these billable codes instead:
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Includes
- lesions showing histological features both of aneurysmal cyst and of another fibro-osseous lesion
Type 2 Excludes
This note appears immediately under a three character code title to further define, or give examples of, the content of the category.
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
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:
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Code HistoryHistory
Questions About K09Overview
Is K09 (Cysts of oral region, not elsewhere classified) a billable code?
No. This is a category header that groups the codes for cysts of oral region, not elsewhere classified, and headers cannot be submitted on claims. Claims for cysts of oral region, not elsewhere classified need a more specific code from this category, such as K09.0, K09.1, and K09.8.
