M27.4Other and unspecified cysts of jaw

M27.4 is the ICD-10-CM diagnosis code for other and unspecified cysts of jaw. It belongs to category M27 (other diseases of jaws), 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 2 subcodes must be used instead.

Within M27, choose M27.4 (Other and unspecified cysts of jaw) only when documentation doesn't support a more specific option: developmental disorders of jaws (M27.0), giant cell granuloma, central (M27.1), inflammatory conditions of jaws (M27.2), alveolitis of jaws (M27.3), periradicular pathology associated with previous endodontic treatment (M27.5), endosseous dental implant failure (M27.6), other specified diseases of jaws (M27.8) and disease of jaws, unspecified (M27.9).

To report this condition, pick the subcode that matches the documentation: M27.40 (jaw) and M27.49 (jaw).

Don't report M27.4 together with the conditions in its Excludes1 note: cysts of oral region (K09.-), latent bone cyst of jaw (M27.0) and Stafne's cyst (M27.0).

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