M26.00 Unspecified anomaly of jaw size

Billable ICD-10-CM code, FY2026.

Applies from M26.0 Major anomalies of jaw size

Excludes1 (never code together)

• acromegaly (E22.0)
• Robin's syndrome (Q87.0)

MS-DRG index

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

Approximate ICD-9-CM (GEMs)

• 524.00 Major anomalies of jaw size, unspecified anomaly

Code annotations containing back-references to M26.00

Back-references to M26

• Type 2 Excludes: K08 Other disorders of teeth and supporting structures ("dentofacial anomalies [including malocclusion] (M26.-)")
• Type 2 Excludes: M95 Other acquired deformities of musculoskeletal system and connective tissue ("dentofacial anomalies [including malocclusion] (M26.-)")
• Type 1 Excludes: Q18 Other congenital malformations of face and neck ("dentofacial anomalies [including malocclusion] (M26.-)")
• Type 1 Excludes: Q38 Other congenital malformations of tongue, mouth and pharynx ("dentofacial anomalies (M26.-)")
• Type 1 Excludes: Q67.4 Other congenital deformities of skull, face and jaw ("dentofacial anomalies [including malocclusion] (M26.-)")
• Type 1 Excludes: Q75 Other congenital malformations of skull and face bones ("dentofacial anomalies [including malocclusion] (M26.-)")

Diagnosis Index entries for M26.00

• Anomaly, anomalous (congenital) (unspecified type) › dentofacial › jaw size

Nearby codes

• M26 Dentofacial anomalies [including malocclusion]
• M26.0 Major anomalies of jaw size
• M26.00 Unspecified anomaly of jaw size (this code)
• M26.01 Maxillary hyperplasia
• M26.02 Maxillary hypoplasia
• M26.03 Mandibular hyperplasia
• M26.04 Mandibular hypoplasia
• M26.05 Macrogenia