K09.8 Other cysts of oral region, not elsewhere classified

The ICD-10-CM code for Other cysts of oral region, not elsewhere classified is K09.8 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Chapter

11: Diseases of the digestive system (K00-K95)

Section

K00-K14: Diseases of oral cavity and salivary glands (K00-K14)

Category K09

5 codes (4 billable)

FY2026 Status

Stable since FY2024

Also Known As

ICD-10-CM Alphabetic Index entries that lead to K09.8:

• Pearl (s) › Epstein's
• Cyst (colloid) (mucous) (simple) (retention) › mouth
• Epstein's › pearl
• Cyst (colloid) (mucous) (simple) (retention) › buccal
• Cyst (colloid) (mucous) (simple) (retention) › lymphoepithelial, oral soft tissue
• Cyst (colloid) (mucous) (simple) (retention) › epidermal, epidermoid (inclusion) (see also Cyst, skin) › mouth
• Cyst (colloid) (mucous) (simple) (retention) › dermoid › oral soft tissue
• Cyst (colloid) (mucous) (simple) (retention) › dermoid › mouth

Inclusion Terms

• Dermoid cyst
• Epidermoid cyst
• Lymphoepithelial cyst
• Epstein's pearl

U.S. Hospital Utilization

• An estimated 1,585 U.S. inpatient stays in 2023 included K09.8 among the documented diagnoses.

Source: National Inpatient Sample (NIS), Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality, 2016–2023. National survey-weighted estimates.

Official Coding Guidelines

Chapter 11 reserved for future expansion

11. Chapter 11: Diseases of the Digestive System (K00-K95) Reserved for future guideline expansion

Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026

References

• CMS — ICD-10-CM Official Code Set and Guidelines, FY2026
• CDC/NCHS — ICD-10-CM Files and Browser Tool
• AHRQ — HCUP National Inpatient Sample, Frequencies by Diagnosis Code (2016–2023)