Dentofacial anomalies [including malocclusion] and other disorders of jaw (M26-M27)
ICD-10 codes M26-M27 cover a wide range of dentofacial anomalies including jaw size irregularities, malocclusion, and disorders affecting jaw function and structure. These codes are used to classify conditions like malocclusion (misaligned bite), jaw size abnormalities such as maxillary or mandibular hyperplasia and hypoplasia, and temporomandibular joint (TMJ) disorders.
This code chapter includes detailed classifications for abnormalities in the size and relationship of jaws, such as maxillary hyperplasia (overgrowth of upper jaw) and mandibular hypoplasia (underdeveloped lower jaw). It also addresses dental arch relationship issues, covering Angle's classes I, II, and III malocclusions, open bites, crossbites, and spacing problems among erupted teeth. Functional abnormalities like abnormal jaw closure, limited mandibular movement, and TMJ disorders; including arthritis, arthralgia, disc displacement, and ankylosis; are catalogued here. The range also encompasses developmental and inflammatory diseases of the jaw (e.g., giant cell granuloma, osteomyelitis), alveolar anomalies (such as maxillary or mandibular hyperplasia and hypoplasia), and complications related to dental implants. The inclusion of synonyms like maxillary jaw size anomaly, Angle's class malocclusion, and temporomandibular joint pain dysfunction syndrome helps link common clinical terms to their corresponding ICD codes, aiding accurate medical coding and diagnosis documentation.
Diseases of the musculoskeletal system and connective tissue (M00–M99)
Dentofacial anomalies [including malocclusion] and other disorders of jaw (M26-M27)
M26 Dentofacial anomalies [including malocclusion]
M26.0 Major anomalies of jaw size
- M26.00 Unspecified anomaly of jaw size
- M26.01 Maxillary hyperplasia
- M26.02 Maxillary hypoplasia
- M26.03 Mandibular hyperplasia
- M26.04 Mandibular hypoplasia
- M26.05 Macrogenia
- M26.06 Microgenia
- M26.07 Excessive tuberosity of jaw
- M26.09 Other specified anomalies of jaw size
M26.1 Anomalies of jaw-cranial base relationship
- M26.10 Unspecified anomaly of jaw-cranial base relationship
- M26.11 Maxillary asymmetry
- M26.12 Other jaw asymmetry
- M26.19 Other specified anomalies of jaw-cranial base relationship
M26.2 Anomalies of dental arch relationship
- M26.20 Unspecified anomaly of dental arch relationship
M26.21 Malocclusion, Angle's class
- M26.211 Malocclusion, Angle's class I
- M26.212 Malocclusion, Angle's class II
- M26.213 Malocclusion, Angle's class III
- M26.219 Malocclusion, Angle's class, unspecified
M26.22 Open occlusal relationship
- M26.220 Open anterior occlusal relationship
- M26.221 Open posterior occlusal relationship
- M26.23 Excessive horizontal overlap
- M26.24 Reverse articulation
- M26.25 Anomalies of interarch distance
- M26.29 Other anomalies of dental arch relationship
M26.3 Anomalies of tooth position of fully erupted tooth or teeth
- M26.30 Unspecified anomaly of tooth position of fully erupted tooth or teeth
- M26.31 Crowding of fully erupted teeth
- M26.32 Excessive spacing of fully erupted teeth
- M26.33 Horizontal displacement of fully erupted tooth or teeth
- M26.34 Vertical displacement of fully erupted tooth or teeth
- M26.35 Rotation of fully erupted tooth or teeth
- M26.36 Insufficient interocclusal distance of fully erupted teeth (ridge)
- M26.37 Excessive interocclusal distance of fully erupted teeth
- M26.39 Other anomalies of tooth position of fully erupted tooth or teeth
- M26.4 Malocclusion, unspecified
M26.5 Dentofacial functional abnormalities
- M26.50 Dentofacial functional abnormalities, unspecified
- M26.51 Abnormal jaw closure
- M26.52 Limited mandibular range of motion
- M26.53 Deviation in opening and closing of the mandible
- M26.54 Insufficient anterior guidance
- M26.55 Centric occlusion maximum intercuspation discrepancy
- M26.56 Non-working side interference
- M26.57 Lack of posterior occlusal support
- M26.59 Other dentofacial functional abnormalities
M26.6 Temporomandibular joint disorders
M26.60 Temporomandibular joint disorder, unspecified
- M26.601 Right temporomandibular joint disorder, unspecified
- M26.602 Left temporomandibular joint disorder, unspecified
- M26.603 Bilateral temporomandibular joint disorder, unspecified
- M26.609 Unspecified temporomandibular joint disorder, unspecified side
M26.61 Adhesions and ankylosis of temporomandibular joint
- M26.611 Adhesions and ankylosis of right temporomandibular joint
- M26.612 Adhesions and ankylosis of left temporomandibular joint
- M26.613 Adhesions and ankylosis of bilateral temporomandibular joint
- M26.619 Adhesions and ankylosis of temporomandibular joint, unspecified side
M26.62 Arthralgia of temporomandibular joint
- M26.621 Arthralgia of right temporomandibular joint
- M26.622 Arthralgia of left temporomandibular joint
- M26.623 Arthralgia of bilateral temporomandibular joint
- M26.629 Arthralgia of temporomandibular joint, unspecified side
M26.63 Articular disc disorder of temporomandibular joint
- M26.631 Articular disc disorder of right temporomandibular joint
- M26.632 Articular disc disorder of left temporomandibular joint
- M26.633 Articular disc disorder of bilateral temporomandibular joint
- M26.639 Articular disc disorder of temporomandibular joint, unspecified side
M26.64 Arthritis of temporomandibular joint
- M26.641 Arthritis of right temporomandibular joint
- M26.642 Arthritis of left temporomandibular joint
- M26.643 Arthritis of bilateral temporomandibular joint
- M26.649 Arthritis of unspecified temporomandibular joint
M26.65 Arthropathy of temporomandibular joint
- M26.651 Arthropathy of right temporomandibular joint
- M26.652 Arthropathy of left temporomandibular joint
- M26.653 Arthropathy of bilateral temporomandibular joint
- M26.659 Arthropathy of unspecified temporomandibular joint
- M26.69 Other specified disorders of temporomandibular joint
M26.7 Dental alveolar anomalies
- M26.70 Unspecified alveolar anomaly
- M26.71 Alveolar maxillary hyperplasia
- M26.72 Alveolar mandibular hyperplasia
- M26.73 Alveolar maxillary hypoplasia
- M26.74 Alveolar mandibular hypoplasia
- M26.79 Other specified alveolar anomalies
M26.8 Other dentofacial anomalies
- M26.81 Anterior soft tissue impingement
- M26.82 Posterior soft tissue impingement
- M26.89 Other dentofacial anomalies
- M26.9 Dentofacial anomaly, unspecified
Dentofacial anomalies [including malocclusion] (M26)
M27 Other diseases of jaws
- 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
- 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
- M27.59 Other periradicular pathology associated with previous endodontic treatment
M27.6 Endosseous dental implant failure
- M27.61 Osseointegration failure of dental implant
- M27.62 Post-osseointegration biological failure of dental implant
- M27.63 Post-osseointegration mechanical failure of dental implant
- M27.69 Other endosseous dental implant failure
- M27.8 Other specified diseases of jaws
- M27.9 Disease of jaws, unspecified
Other diseases of jaws (M27)
Instructional Notations
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
