K09.8 — Other cysts of oral region, not elsewhere classified
K09.8 is a billable, specific ICD-10-CM code for other cysts of oral region, not elsewhere classified. It is valid for submission on a claim.
Inclusion terms
Alternative wordings a physician may use in the chart for this same code.
- Dermoid cyst
- Epidermoid cyst
- Lymphoepithelial cyst
- Epstein's pearl
Excludes2 inherited from the categories above K09.8
Also inherited, and the opposite of Excludes1: these conditions are not part of K09.8, but a patient can have both, so you may code both.
Other codes that can never be billed with K09.8
These codes carry an Excludes1 note pointing at K09.8. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading K09.8 alone.
- M27.4Other and unspecified cysts of jaw
Risk adjustment
K09.8 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.
Medicare coverage
K09.8 is named in 3 Medicare coverage policies — 3 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A54111Billing and Coding: Speech Language Pathology (SLP) Services: Communication Disorders
- A57044Billing and Coding: Removal of Benign Skin Lesions
- A57204Billing and Coding: MRI and CT Scans of the Head and Neck
How K09.8 is indexed
Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to K09.8.
- Cyst›buccal
- Cyst›lymphoepithelial, oral soft tissue
- Cyst›mouth
- Epstein's›pearl
- Pearl›Epstein's
- Cyst›dermoid›mouth
- Cyst›dermoid›oral soft tissue
- Cyst›epidermal, epidermoid›mouth
- Cyst›epidermal, epidermoid›oral soft tissue
- Cyst›oral›region›specified NEC
- Cyst›oral›soft tissue›specified NEC
Code history
K09.8 has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.
Related codes at this level
Codes that share K09. If K09.8 is not quite right, the correct code is usually one of these.
Questions about K09.8
- Is K09.8 a billable ICD-10-CM code?
- Yes. K09.8 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does K09.8 sit in the tabular list?
- Diseases of the digestive system (K00-K95), in the block Diseases of oral cavity and salivary glands (K00-K14).