NPI Atlas

K09 – Cysts of oral region, not elsewhere classified

ICD-10-CM 2027 diagnosis code · Diseases of oral cavity and salivary glands

Non-billable header

ICD-10-CM code K09

Code: K09 (claims format: K09)
Description: Cysts of oral region, not elsewhere classified
Billable: No – use a more specific code below
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 11. Diseases of the digestive system (K00-K95)
Block: K00-K14 Diseases of oral cavity and salivary glands

Billable codes under K09

K09 is a header code and cannot be used on claims. Choose the most specific code:

K09.0 – Developmental odontogenic cystsBillable
K09.1 – Developmental (nonodontogenic) cysts of oral regionBillable
K09.8 – Other cysts of oral region, not elsewhere classifiedBillable
K09.9 – Cyst of oral region, unspecifiedBillable

Notes for K09

Includes:

lesions showing histological features both of aneurysmal cyst and of another fibro-osseous lesion

Excludes2 (not included here):

cysts of jaw (M27.0-, M27.4-)
radicular cyst (K04.8)

Frequently asked questions

What is ICD-10 code K09?

K09 is the ICD-10-CM code for cysts of oral region, not elsewhere classified, in the block K00-K14 (Diseases of oral cavity and salivary glands).

Is K09 a billable code?

No. K09 is a header code with more specific child codes; report one of the billable codes listed above.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.