K09
Cysts of oral region, not elsewhere classified
Non-billable headerNot valid on its own. Use one of the more specific codes under it.
K09 is a non-billable ICD-10-CM code category for cysts of oral region, not elsewhere classified. Report a more specific code from it instead. It is part of the FY2027 code set, effective October 1, 2026. The more specific codes under it are K09.0 Developmental odontogenic cysts; K09.1 Developmental (nonodontogenic) cysts of oral region; K09.8 Other cysts of oral region, not elsewhere classified and K09.9 Cyst of oral region, unspecified. Its coding notes include 10 Excludes2 entries.
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
Also from chapter/block level (8 notes)
Inherited from Chapter 11 Diseases of the digestive system
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
Includes
Further defines or gives examples of the content of the category.
This code
- lesions showing histological features both of aneurysmal cyst and of another fibro-osseous lesion