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 2026, 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.
Alveolar Bone Loss
Resorption or wasting of the tooth-supporting bone (ALVEOLAR PROCESS) in the MAXILLA or MANDIBLE.
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).
Open Bite
A condition in which certain opposing teeth fail to establish occlusal contact when the jaws are closed.
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
```htmlICD-10 code M26 covers dentofacial anomalies, including various malocclusions and jaw irregularities. These codes are used to classify conditions affecting the size, shape, position, and functional relationships of the jaws and teeth, such as jaw size anomalies and temporomandibular joint disorders.
The M26 section provides specific codes for detailed jaw abnormalities like M26.01 (maxillary hyperplasia) and M26.04 (mandibular hypoplasia), addressing excess or deficient bone growth. It also includes malocclusions described by Angle’s classification (M26.211, M26.212, M26.213) and anomalies in dental arch relationships, such as crossbite or open bite. Coders can identify conditions like excessive spacing between teeth, crowding, or rotation of fully erupted teeth using codes within M26.3. Functional disorders like jaw movement limitations and temporomandibular joint (TMJ) arthritis or disc disorders appear under M26.5 and M26.6. These detailed classifications assist healthcare professionals and coders in documenting congenital or acquired dentofacial abnormalities accurately. Common terms like “Macrognathia,” “Micrognathia,” “Open bite,” or “TMJ disorder” directly correspond to specific ICD-10 codes in this series, facilitating precise diagnosis coding in dental and maxillofacial care.
```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, 2025 through September 30, 2026. 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 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
