M27.40 Unspecified cyst of jaw

Billable ICD-10-CM code, FY2026.

Applicable to

• Cyst of jaw NOS

Applies from M27.4 Other and unspecified cysts of jaw

Excludes1 (never code together)

• cysts of oral region (K09.-)
• latent bone cyst of jaw (M27.0)
• Stafne's cyst (M27.0)

MS-DRG index

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

Approximate ICD-9-CM (GEMs)

• 526.2 Other cysts of jaws (approximate)

Code annotations containing back-references to M27.40

Back-references to M27.4

• Type 2 Excludes: K09 Cysts of oral region, not elsewhere classified ("cysts of jaw (M27.0-, M27.4-)")
• Type 2 Excludes: M85.4 Solitary bone cyst ("solitary cyst of jaw (M27.4)")
• Type 2 Excludes: M85.5 Aneurysmal bone cyst ("aneurysmal cyst of jaw (M27.4)")
• Type 1 Excludes: M85.6 Other cyst of bone ("cyst of jaw NEC (M27.4)")

Back-references to M27

• Type 2 Excludes: K08 Other disorders of teeth and supporting structures ("disorders of jaw (M27.-)")

Diagnosis Index entries for M27.40

• Cyst (colloid) (mucous) (simple) (retention) › alveolar process (jaw bone)
• Cyst (colloid) (mucous) (simple) (retention) › bone (local) NEC › specified type NEC › jaw
• Cyst (colloid) (mucous) (simple) (retention) › jaw (bone)
• Cyst (colloid) (mucous) (simple) (retention) › mandible
• Cyst (colloid) (mucous) (simple) (retention) › maxilla
• Cyst (colloid) (mucous) (simple) (retention) › solitary › jaw

Nearby codes

• M27.0 Developmental disorders of jaws
• M27.1 Giant cell granuloma, central
• M27.2 Inflammatory conditions of jaws
• M27.3 Alveolitis of jaws
• M27.4 Other and unspecified cysts of jaw
• M27.40 Unspecified cyst of jaw (this code)
• M27.49 Other cysts of jaw
• M27.5 Periradicular pathology associated with previous endodontic treatment
• M27.51 Perforation of root canal space due to endodontic treatment
• M27.52 Endodontic overfill
• M27.53 Endodontic underfill