M26.0Major anomalies of jaw size

M26.0 is the ICD-10-CM diagnosis code for major anomalies of jaw size. It belongs to category M26 (dentofacial anomalies [including malocclusion]), block M26-M27 (dentofacial anomalies [including malocclusion] and other disorders of jaw) and chapter 13 (diseases of the musculoskeletal system and connective tissue). It is a header code, so it can't be reported by itself; one of its 9 subcodes must be used instead.

Within M26 (dentofacial anomalies [including malocclusion]), M26.0 is specifically for major anomalies of jaw size. Related codes cover anomalies of jaw-cranial base relationship (M26.1), anomalies of dental arch relationship (M26.2), anomalies of tooth position of fully erupted tooth or teeth (M26.3), malocclusion, unspecified (M26.4), dentofacial functional abnormalities (M26.5), temporomandibular joint disorders (M26.6), dental alveolar anomalies (M26.7), other dentofacial anomalies (M26.8) and 1 more.

To report this condition, pick the subcode that matches the documentation: M26.00 (size), M26.01 (hyperplasia), M26.02 (hypoplasia), M26.03 (hyperplasia), M26.04 (hypoplasia), M26.05 (macrogenia), M26.06 (microgenia), M26.07 (jaw) and 1 more.

Don't report M26.0 together with the conditions in its Excludes1 note: acromegaly (E22.0) and Robin's syndrome (Q87.0).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.