Dentofacial anomalies [including malocclusion] (M26) ICD-10-CM
The M26 code range covers dentofacial anomalies [including malocclusion] with 95 ICD-10-CM diagnosis codes. 78 of them are billable and valid for claim submission in fiscal year 2027, and the category headers group them but cannot themselves be billed.
Codes in the M26 Range 95 codes · 78 billable
- M26 Dentofacial anomalies [including malocclusion]Non-billable
- M26.0 Major anomalies of jaw sizeNon-billable
- 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 relationshipNon-billable
- 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 relationshipNon-billable
- M26.20 Unspecified anomaly of dental arch relationship
- M26.21 Malocclusion, Angle's classNon-billable
- 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 relationshipNon-billable
- 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 teethNon-billable
- 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 abnormalitiesNon-billable
- 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 disordersNon-billable
- M26.60 Temporomandibular joint disorder, unspecifiedNon-billable
- 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 jointNon-billable
- 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 jointNon-billable
- 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 jointNon-billable
- 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 jointNon-billable
- 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 jointNon-billable
- 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 anomaliesNon-billable
- 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 anomaliesNon-billable
- M26.81 Anterior soft tissue impingement
- M26.82 Posterior soft tissue impingement
- M26.89 Other dentofacial anomalies
- M26.9 Dentofacial anomaly, unspecified
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the M26 range.
Diastema
An abnormal opening or fissure between two adjacent teeth.
Malocclusion
Such malposition and contact of the maxillary and mandibular teeth as to interfere with the highest efficiency during the excursive movements of the jaw that are essential for mastication. (Jablonski, Illustrated Dictionary of Dentistry, 1982)
Malocclusion, Angle Class I
Malocclusion in which the mandible and maxilla are anteroposteriorly normal as reflected by the relationship of the first permanent molar (i.e., in neutroclusion), but in which individual teeth are abnormally related to each other.
Malocclusion, Angle Class II
Malocclusion in which the mandible is posterior to the maxilla as reflected by the relationship of the first permanent molar (distoclusion).
Malocclusion, Angle Class III
Malocclusion in which the mandible is anterior to the maxilla as reflected by the first relationship of the first permanent molar (mesioclusion).
Micrognathism
Abnormally small jaw.
Open Bite
A condition in which certain opposing teeth fail to establish occlusal contact when the jaws are closed.
Overbite
A malocclusion in which maxillary incisor and canine teeth project over the mandibular teeth excessively. The overlap is measured perpendicular to the occlusal plane and is also called vertical overlap. When the overlap is measured parallel to the occlusal plane it is referred to as overjet.
Prognathism
A condition marked by abnormal protrusion of the mandible. (Dorland, 27th ed)
Retrognathia
A physical misalignment of the upper (maxilla) and lower (mandibular) jaw bones in which either or both recede relative to the frontal plane of the forehead.
Temporomandibular Joint Disorders
A variety of conditions affecting the anatomic and functional characteristics of the temporomandibular joint. Factors contributing to the complexity of temporomandibular diseases are its relation to dentition and mastication and the symptomatic effects in other areas which account for referred pain to the joint and the difficulties in applying traditional diagnostic procedures to temporomandibular joint pathology where tissue is rarely obtained and x-rays are often inadequate or nonspecific. Common diseases are developmental abnormalities, trauma, subluxation, luxation, arthritis, and neoplasia. (From Thoma's Oral Pathology, 6th ed, pp577-600)
About the M26 Code Range
Dentofacial anomalies involve the jaws, the way the teeth fit together, tooth position, and jaw-joint function.
The subdivisions separate jaw size in M26.0 from jaw shape and its relationship to the skull base in M26.1. They then distinguish how the dental arches meet in M26.2 from the position of fully erupted teeth in M26.3. M26.4 identifies malocclusion, or a misaligned bite, without specifying its type. Other groups address jaw function in M26.5, jaw-joint disorders in M26.6, and anomalies of the tooth-bearing jaw area in M26.7. M26.8 includes other dentofacial anomalies, while M26.9 leaves the anomaly unspecified.
Questions About This Page
How many billable codes are in the M26 range?
Of the 95 codes in this range, 78 are billable and valid for claim submission from October 1, 2026 through September 30, 2027. Category header codes group them but cannot be reported on claims.
What does the M26 range classify?
The range classifies dentofacial anomalies [including malocclusion]. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
