ICD-10-CM 2027
ICD-10 code for eruption cyst
From the official ICD-10-CM alphabetic index entry “Cyst (colloid) (mucous) (simple) (retention) › eruption”. Page updated September 29, 2026.
About coding eruption cyst
The ICD-10-CM code for eruption cyst is K09.0 (Developmental odontogenic cysts).
Within K09 (cysts of oral region, not elsewhere classified), K09.0 is specifically for developmental odontogenic cysts. Related codes cover developmental (nonodontogenic) cysts of oral region (K09.1), other cysts of oral region, not elsewhere classified (K09.8) and cyst of oral region, unspecified (K09.9).
The conditions in its Excludes2 note aren't part of K09.0, but may be coded alongside it if the patient has both: keratocysts (D16.4, D16.5) and odontogenic keratocystic tumors (D16.4, D16.5).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
Common questions about eruption cyst ICD-10 codes
What is the ICD-10 code for eruption cyst?
- K09.0 — Developmental odontogenic cysts.
Is K09.0 billable?
- Yes. K09.0 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can K09.0 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict K09.0 as a principal diagnosis.
Is K09.0 a CC or MCC?
- No. K09.0 is neither a CC nor an MCC under MS-DRG v44.0.