K09.1 Developmental (nonodontogenic) cysts of oral region

Billable ICD-10-CM code, FY2026.

Applicable to

• Cyst (of) incisive canal
• Cyst (of) palatine of papilla
• Globulomaxillary cyst
• Median palatal cyst
• Nasoalveolar cyst
• Nasolabial cyst
• Nasopalatine duct cyst

Applies from K09 Cysts of oral region, not elsewhere classified

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)

MS-DRG index

Defines the logic of DRG(s) 011-013 in MDC PRE.

Approximate ICD-9-CM (GEMs)

• 526.1 Fissural cysts of jaw (approximate)

Code annotations containing back-references to K09.1

Back-references to K09

• Type 2 Excludes: K13 Other diseases of lip and oral mucosa ("cysts of oral region (K09.-)")
• Type 1 Excludes: M27.4 Other and unspecified cysts of jaw ("cysts of oral region (K09.-)")

Diagnosis Index entries for K09.1

• Cyst (colloid) (mucous) (simple) (retention) › anterior › nasopalatine
• Cyst (colloid) (mucous) (simple) (retention) › bone (local) NEC › specified type NEC › jaw › developmental (nonodontogenic)
• Cyst (colloid) (mucous) (simple) (retention) › developmental
• Cyst (colloid) (mucous) (simple) (retention) › developmental › oral region (nonodontogenic)
• Cyst (colloid) (mucous) (simple) (retention) › fissural (oral region)
• Cyst (colloid) (mucous) (simple) (retention) › globulomaxillary
• Cyst (colloid) (mucous) (simple) (retention) › incisive canal
• Cyst (colloid) (mucous) (simple) (retention) › jaw (bone) › fissural
• Cyst (colloid) (mucous) (simple) (retention) › median › anterior maxillary
• Cyst (colloid) (mucous) (simple) (retention) › median › palatal
• Cyst (colloid) (mucous) (simple) (retention) › nasoalveolar
• Cyst (colloid) (mucous) (simple) (retention) › nasolabial
• Cyst (colloid) (mucous) (simple) (retention) › nasopalatine (anterior) (duct)
• Cyst (colloid) (mucous) (simple) (retention) › oral › region › developmental (nonodontogenic)
• Cyst (colloid) (mucous) (simple) (retention) › palate (median) (fissural)
• Cyst (colloid) (mucous) (simple) (retention) › palatine papilla (jaw)

Nearby codes

• K09 Cysts of oral region, not elsewhere classified
• K09.0 Developmental odontogenic cysts
• K09.1 Developmental (nonodontogenic) cysts of oral region (this code)
• K09.8 Other cysts of oral region, not elsewhere classified
• K09.9 Cyst of oral region, unspecified